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With Artificial Intelligence more than 90% accurate yield prognosis!

It is possible to make more money when you make a good forecast of your yield, that has been known for years by growers and traders. However growers, growers associations and traders are struggling with this for years: the inaccuracy of the prognoses makes it not clear enough how much product is expected in the coming period. These prognosis regularly differ dozens of percent from reality. LetsGrow.com has developed, through the use of Machine Learning, for tomato a harvest forecast with an average more than 90% accurate!
The past as input
Many growers make crop prognoses for the sale of their products. With this information the sales process can be optimized. No shortage or surplus of product, ensures a better return on sales. It is also possible to optimize internal processes , such as work scheduling, at the nursery with this information.

Peter Hendriks, Business Unit Manager at LetsGrow.com: "I am regularly approached by growers with the question whether we can build an accurate and universal crop prognosis system. We have for some years now a plant physiological crop prognosis model for tomato which is doing reasonably well. However, it takes time to do the counting for the harvest forecast accurately, so that the model remains accurate. In addition, this way is error-prone, since the model only looks at the present. We also should use data from the past."

Artificial Intelligence vs. plant physiology
For over 17 years, LetsGrow.com has been collecting data from and for their customers. How nice would it be if these data can be separately used by each grower by making it an efficient yield forecasting model? Hendriks: "The technology is developing rapidly. In recent months, we specialized ourselves in Machine Learning. This form of Artificial Intelligence is really an incredibly powerful tool! By combining our plant physiological background with this technique, we can switch quickly to provide very accurate analyzes, such as this prognosis , for our customers."

Is it a lot of work for a grower to do this forecast? Hendriks: "We train the system for the grower. The system is trained per grower with its own data. The system recognizes patterns from the past and in combination with crop registrations that are already being done, the harvest forecast for the coming 4 weeks is predicted. If the historical data of a grower is already in our system, we can immediately start working on it. If not, then we have to find a way how we can retrieve the correct data. In fact, it costs the grower very little work. And it delivers a lot!"

Has the end been achieved considering accuracy with this forecast? Hendriks: "No, certainly not! The name Machine Learning says it all: the system continues to learn itself. It is getting better and better over time. In addition, we are also further refining the underneath model.
We are also working on integrating new data sources to be able to use them in the model, such as the measurements made by HortiKey. They measure, among other things, automatically the inventory of the tomatoes that are still in the greenhouse. If we combine this with our technique, we will reduce the manual input even more and can we further increase this forecast to 99.9%!”

Are you interested in this new and accurate crop forecast? Contact us or visit us at the Horticontact at stand 401. The analysis is now available for tomato growers. Other crops follow quickly.
For more information:
Peter Hendriks
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+31 - 657583579


Ton van Dijk
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+31 - 653735670



"With data analysis we can make the next step"

The production has been good for years, both in quality and in quantity. Nonetheless, you want to keep improving your company and yourself as a grower. What can help you to make the next step? By means of a very extensive data analysis, actions and achievements over the past years are analyzed in order to come to useful insights that will help you as a grower to improve both your production as well as the product quality. Letsgrow.com makes data analysis over several years now available for all growers.

Hans Vereijken2In the past period, there has been a rapid development of data analyses in the greenhouse sector. With the help of smart and advanced Big Data and Artificial Intelligence techniques, it is now possible to make analysis that simply cannot be made by human brains. With these techniques, the greenhouse sector will experience a further development by which the production shall improve both qualitative and quantitative.

When these modern techniques are combined with plant physiology knowledge and models, it gives great possibilities to optimize the growth even further. LetsGrow has both competences and has carried out a data analysis for Vereijken Kwekerijen.

Director Hans Vereijken "We believe in growing with the help of data. For years, we use LetsGrow to visualize and analyze the data of our locations at a central place. We want to have a discussion about what we want to achieve and how to realize our goals, instead of discussing afterwards our results. Recently, LetsGrow.com has completed a new functionality, with which we can even better apply our Plan-Do-Check-Act methodology. We are now implementing this new functionality. However, we actually wanted more. How do we grow exactly? What does science say about it? And what can we do to have even better results?”

Therefore, LetsGrow.com has carried out a Light Use Efficiency (LUE) data analysis over the past four years for five locations. The LUE shows the efficiency of the conversion of radiation to production. The analysis showed that these LUE fluctuates too much during a year. This data analysis gives enough input to pay more attention to these fluctuations.

Peter Hendriks, Business Unit Manager LetsGrow.com: "For years, Vereijken is a customer of us. We stored all their data over the past years, just as we do for all our customers. Now we offer our customers the possibility to make money out of their data. With the LBE analysis we can point directly to moments when they do it well and when they can improve, but also how they can improve. Then it is up to the advisor and grower to implement these new insights. We also offer the possibility to keep doing the analysis periodically, to analyze whether the improvements are carried out and what the results of these improvements are. With the Climate Monitor, we have already a tool whereby you can see on a daily basis (even on a 5-minute basis) if your climate is in control. With this Climate Monitor you can achieve large improvements!”

Hans Vereijken: “With all our growers we follow a course Data Driving Growing. With this course we aim to understand the results of the data analysis better, to connect the theory and research to practice so we can apply it better. With an increasing number of measuring equipment’s, it becomes more complicated to combine all the data to useful information. Therefore, extra tools are needed, but we still need to know how to handle these data. In the end, with this we optimize our way of growing. With the data analysis we can make the next step.”

Are you also interested where you can optimize and are you interested in data analysis for your company with your data, please contact Peter Hendriks or Ton van Dijk of LetsGrow.com.

Ton van Dijk

Tel: +31 (0)6 53735670
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LetsGrow.com & 2Grow confirm partnership


Do my crops grow generative or vegetative? What is the effect of changes in greenhouse climate on my crops? With the partnership between 2Grow and LetsGrow.com it is possible to get answers to these questions.

Since a couple of months it is possible to connect the sensors of 2Grow to the platform of LetsGrow.com. A couple of growers already uses this possibility. On Wednesday 28th of December 2017 both company`s signed the partnership agreement. This made the partnership formally a fact.

2Grow sells two sensors as a package. The flow sensor and a diameter variation sensor. The sensors measure the reaction of the plant to changes in the climate (irrigation, exposure, ...) or manipulations (pruning, harvesting, ...). With these sensors you can see the daily growth of the plants, if the plants grow generative or vegetative and it is possible to detect early plant stress.

Connecting these sensors to LetsGrow.com will give you the possibility to see your sensor data in combination with climate data at a glance. Besides the analyse options it is also possible to get notifications about for example long-term plant stress. Shortly it will be possible to get daily/weekly notifications about the growth of the plants.

2Grow partnerschapfrom left tot right: Olivier Begerem, Luc van der Sar, Michelle Varrewaere



LetsGrow.com Climate Monitor

LetsGrow.com has developed the Climate Monitor. The LetsGrow.com Climate Monitor tells you if there is a reason to adjust the cultivation control. The Climate Monitor allows you to monitor the climate real-time and summarizes the factors that determine the climate.

Climate is a combination of different growing factors. Each radiation level has certain thresholds for these factors for an optimal climate. You can determine the thresholds for temperature, humidity and CO₂ yourself to define your optimal climate.


climate monitor limits

The Climate Monitor shows if the optimal climate is realized, registers deviations and displays this in graphs and overviews. Via e-mail notification you can automatically mail the deviations to yourself.
The Climate Monitor enables growers of all crops to follow the important growing factors temperature, humidity and CO₂ in relation to the radiation (PAR).

Want to know more about the Climate Monitor? Read the full article or contact us via our servicedesk or call us at +31-10-4608108.



Online training

Online training

The platform of LetsGrow.com can be used at its best when users know all the possibilities of our platform and how to use it. That's why LetsGrow.com offers online traning to support you in using LetsGrow.com and to give you updates about the latest technologies and features.

Our Greenhouse Information Specialist will look at your specific situation, your preferences and needs, so you can get the best insights out of your data!

For who?
This training is offered to users of LetsGrow.com who want to know more about the features of the LetsGrow.com platform. This can be new users, but also new employees of your company.

·        New features
What has been added to the platform recently?
·        Future developments
Which features will be added soon to the platform?
·        Need for information
Which specific needs or questions does the group have?
·        Give substance to information
The Greenhouse Information Specialist will make new dashboards together with you, so you can use your data at its best.
·        Explanation
The Greenhouse Information Specialist teaches you how you can discover your the information you want to focus on and visualise with the help of the dashboard, how you can use the apps, how you can share data and make groups.

Why do we offer an online training?
·        No travelling time
·        Flexible to plan
·        Convenience (from your workplace)
·        On request, we can film the training

One meeting will take 2 or 3 hours. The online training is given during office hours.

An online training costs €195,- per meeting.
Possible follow-up will be discussed in consultation.

Updated dashboard gives more insight into your data

Collecting data out of different systems and putting it next to each other to take sollid and well founded decisions. For many entrepeneurs this is a time consuming task. For many years, LetsGrow.com collects data out of differnt sources as climate computers, sensor units, machines and apps. And now we have a brand new addition: dasboards that you can create yourself! With this dashboard, you can see the data you want at one single glance.

A plain insight
To create even more insight for our customers than before, we have developed a dashboard with which you can create your own graphs, tables and gauges. With these new indicaters, you can see immediately if everything goes according to plan.

It is possible to have several dashboards at the same time. For example, you can put the climate monitor of multiple locations in one dashboard, so you can see at a single glance at which location you need to pay attention first. Or you can place a heatmap of your location together with a graph showing information about heating and vents.

'The dashboard is an addition that is avaible for all our customers', as Ton van Dijk, our sales managers tells. 'In conversations with our customers, we noticed that because there is a large amount of data people want to have a clear overview. With this dashboard we want to provide this overview. The customores who tested this new dashboard are very positive about it. The best thing about this new addition is that it is free available for all our customers, without additional costs.'

Although setting up the dashboard is quite easy, we also give support to our customers with manuals, small video`s with instructions and we have a supportdesk. See manuals.

An appointment? 
For more information about our onine training possibilities, have a look at https://www.letsgrow.com/en/news/871-online-training or send an e-mail to This email address is being protected from spambots. You need JavaScript enabled to view it.

The Heatmap of LetsGrow.com provides new insight

The Heatmap of LetsGrow.com provides new insight
LetsGrow.com has developed the heatmap to provide more insight into the differences in temperature and RH in a greenhouse. Climate fluctuations in the greenhouses are unwanted. It can lead to problems with the growth of the plants in "the corners of the greenhouses", which in turn can lead to differences in production and quality. Climate fluctuations can lead to molds or other diseases that can affect your plant. How can you prevent this?


Horizontal differences in temperature and RH
By this moment, a greenhouse has a limited amount of sensor units that are connected to the climate computer.
These sensor units measure the temperature, RH and the CO2. These units present the data as if the climate in a greenhouse is evenly spaced. However, recent research has shown that there are greater differences between temperature and RH in a greenhouse than has been thought earlier, according to Ton van Dijk, salesmanager LetsGrow.com


heatmap THeatmap RV 1


Insights in temperature
Since a few months, it is possible to show the data from all your sensor units in a heatmap.
With the data out of the sensor units we can make an overview of the temperature and relative air humidity in the greenhouse, even on a 5 minute basis. By showing these measurments as a movie, you can get a perfect insight into the temperature in your greenhouse.


Technical adjustments
we can make a 3D overview of the greenhouse, by hanging the sensor units at different heights in the greenhouse, for example between the plants, at the head of the plant and at the screens.
Ton van Dijk: "With the help of this measurments, we can seriously think about technical adjustments that are needed for the greenhouse, in order to optimise the climate in the greenhouse"


Sensor units
Letsgrow.com can collect, present and analyse the data of every sensor unit. In this way, the heatmap can be expanded by measurements of other systems. With this data, we can make correlations between the different measurements. By making these correlations, we can explain the different situations in your greenhouse and help you to prevent the plants from growth or quality differences, diseases or pests. Our goal is to give you a higher production with a better quality.


Are you interested?

Are you interested in the possibilities for your company? Please contact LetsGrow.com via This email address is being protected from spambots. You need JavaScript enabled to view it. or via our telephone number: +31 10- 460 81.08



Van den Berg Est best Dutch Hortensia grower


Van den Berg Est BV is the best grower of Hortensia in The Netherlands. Marjanne and Tom van den Berg won the Hortensia Award with their Hydrangea macrophylla Caipirinha®. Grower Tom van den Berg: “It all starts with balance.”

Marjanne and Tom van den Berg from Est started growing Hortensia’s for indoor and outdoor uses in 2004. Besides, their company Van den Berg Est BV is a high quality producer of Poinsettia and 1-year-plants. Every friday and saturday the products are being sold at the nursery.

Average vase life of over 35 days!

In week 12 Marjanne en Tom van den Berg admitted the Hydrangea macrophylla Caipirinha® for a test by Knowlede Centre for Product Quality Royal FloraHolland. Caipirinha is a new Hortensia with a distinctive colour. The Hortensia starts green, turns white and then again turns green.

The test was constisted of three phases: Transport (96 hour, 15ºC, packed, in a tray), Shop (72 hour, 20ºC, in a tray) and Consumer (840 hours/35 days). The result: a average vase life of over 35 days!

Three different variables

“At our nursery the plants are the starting point of all our decisions”, says Tom van den Berg. ” Throughout the year we use three different variables: energy, water and ‘assimalates’ of the plant. Therefor our stock is healthier and have more resisant and our customers can enjoy our plants much longer.”

Monitoring these balances is highly automated at Van den Berg Est BV. The company uses the Climate Monitor by LetsGrow.com. Yuri Alsemgeest of LetsGrow.com congratulated Van den Berg Est BV with a delicious cake.


Prevent diseases and damage with Thermoview 48

If the temperature of a flower or fruit drops below the dew point several diseases may arise, such as botrytis and head rot. However, if the temperature is too high, there is a risk of damage. LetsGrow.com now has the solution for this: a thermal camera that can be combined with data from your climate computer. The Thermoview 48 measures the temperature in your crop and gives a signal when, for example, the crop reaches the dew point.

themoview letsgrow

LetsGrow.com collects and analyzes all data professional growers need to improve their production and business operation and to eliminate risks. Manager Peter Hendriks from LetsGrow.com: "We’re often asked if we have a solution to prevent diseases and damage. Wouldn’t it be nice if the growers gets a signal when flowers or fruits are too hot or too cold? This way you can prevent damage and diseases. Much wiser than only betting on the cure after the fact!"


LetsGrow.com is launching the Thermoview 48 together with a supplier of thermal imaging cameras. Hendriks: "We’re very proud of this. With this thermal camera, connected to the LetsGrow.com platform, it is possible to measure fruit, flower and plant temperatures in real time with only one device!"

themoview camera
The LetsGrow.com platform also provides access to other data sources, so it’s possible to obtain both the temperature and the RH from the climate computer or other (wireless) sensors in real-time. This way the dew point can be calculated. Hendriks emphasizes that the camera is an extension and not a replacement of existing climate computer sensors.

“I steer to this now”

Some growers recently tested the Thermoview 48 and LetsGrow.com and could so experience the effect of crop radiation on head temperatures. One cucumber grower: "You can clearly see the effect of screening on the head temperature. I can see it in the charts, but also in the photos that are taken every hour and are playable as a movie. That gives me a lot of insight into the behavior of the heads under different conditions. I steer to this now. I consult the result with my crop advisor. And we have many meaningful discussions about the newly generated insights."

thermoview graph
Vertical temperature differences

In conjunction with the LetsGrow.com platform the Thermoview 48 provides more relevant information, says Hendriks. "For example, it is possible to detect vertical temperature differences at one glance. You really know what's going on with your crop, in real-time and with historical data."

"With LetsGrow I extract more information from my greenhouse"

"Pushing the limits of Next Generation Growing"

Joost Matijsen grows high wire cucumbers. In itself that is not so unique in the Netherlands anymore. He is a leader when it comes to relying on automation in the greenhouse. With the LetsGrow system he pushes the limits of cultivation. "Thanks to the data we can move forward with Next Generation Growing."

Joost Matijsen grows high wire cucumbers for Green Diamonds on 3 hectares in Etten-Leur. To optimize cultivation he has been working with the modules developed by crop advisor and Next Generation Growing (HNT) trainer Peter Geelen for LetsGrow.com for years. The climate computer sends information to the system. "LetsGrow adds up and clarifies the data. This way connections can be made and more information can be extracted from the greenhouse."


Information sharing
Two years ago Matijsen installed vertical fans and a plastic screen to move forward with HNT. He follows HNT courses that use LetsGrow analyses. Matijsen: "Then we can discuss them at the next meeting. It makes the conversation more reliable and faster."

Isn’t that precisely what makes growers shudder; sharing information with potential competitors? That’s not how he sees it. "If you are willing to share data you can have a good and honest discussion. And when you are an HNT student you’ve already opened up to something new. You’ll be pushing limits to move forward. And then it's nice when others are observing. Together you can go further, that’s the big advantage.”

Green Diamonds
Besides the HNT course group Matijsen also collaborates within the Green Diamonds cooperative. The growers want to distinguish themselves on quality and assume that the life span of a cucumber begins with the plant. Matijsen: "The longer it hangs on the plant, the shorter the life span. The cucumber is the opposite of a cut-price chicken. The faster a cucumber grows, the tastier and fresher it comes off the plant. You can hang a plant full of cucumbers, but that won’t improve the quality."
This is why growers make plant load predictions in combination with light incidence. "With the right scale you can immediately see how you should steer. Whether extra pruning is needed, or if next year you should get an extra stalk in." LetsGrow data are shared in this regard as well.

If it’s up to Matijsen, automation can go much further in the future: "What we use now is a robust system. Thanks to, for example, Peter Geelen’s modules LetsGrow is already calculating the numbers from the climate computer. What if you start steering on the basis of those numbers? HNT has shown that you have to attune the daily temperature to the amount of light. If you have a lot of light, you use a higher temperature."
"A next step could be to feed information back from LetsGrow to the climate computer." Not being involved with the greenhouse at all – that's something he doesn’t see happening. "But we do see with HNT that most problems happen overnight. You need your sleep so you won’t notice it until morning. And then you can’t do anything about it anymore. To overcome this, you will ultimately have to rely on automation."

Migration LetsGrow servers

On 12 November at 18:00 CET we are migrating our servers to another data center. We expect to be up again at 22:00 CET.

LetsGrow.com continues to innovate! We constantly strive to expand and improve our products and services.

As you know your data is stored in our secure database. Our servers and database are not hosted “in the cloud” but in a physical location in a data center in Rotterdam. Because the servers are now due for replacement, we also selected a new data center. In the new data center, we have our own, new, physical servers.

With the migration to the new data center and servers, we also implemented a quality improvement, resulting in an even higher availability and reliability. We ensure that everything is dual (redundant) performed: the servers, the software and the database. If any of these components malfunction, then the other one will take over. You won't even notice this.

What does this mean for you?
· The site will not be available for a couple of hours.
· The preparations are made so that data loss will not occur.

We are fully busy with preparations for the migration and will keep you informed the coming days.

Keep an eye on our website!

LetsGrow launches new web site

LetsGrow.com launches on April 21, its completely redesigned website.
Besides a new look and feel LetsGrow.com is now also optimized for mobile devices like tablet and phone.

Always logged in

LetsGrow.com has added the possibility to stay permanently logged in. In the upper right corner login section is added the option "Stay logged in".



This option is used per PC. When your computer is used with one Windows user profile on one PC and each user has it's own LetsGrow.com account, then the permanently logged in function cannot be used.


Please use the function with caution. Be advised that everybody using your pc can also use your LetsGrow.com account, without loggin in first.


You can disable the permanently logged in function easily by clicking "log out" and unchecking the checkbox.


Jack van Dongen wins Horticulture Digital iPad!


The iPad that was raffled off to visitors to the Horticulture Digital Square was won by Jack van Dongen (Terheijden). LetsGrow.com was one of the participants of this square during the Horticulture Relations days in Gorinchem.2011-03-04_JackvanDongen


Jack was the owner of a cut-plant and cut-flowers nursery for many years. He called it a healthcare nursery, because he also offered work to a group of people with limited intellect. When the healthcare nursery grew too large, he decided to work for a garden centre. His own nursery became a side-business, but still with a size of 1.5 hectares.


Jack continues to monitor developments in ornamental horticulture. This is why he also visited the Horticulture Relations days in Gorinchem. Innocuously putting the winning ticket in the post box, he was lucky at the Horticulture Digital Square. Jack’s reaction was: “I have never won anything in my life!”

The iPad was donated on behalf of the participating companies at the Horticulture Digital Square: Q-ray, LetsGrow.com, Groeinet, E-man, Uniware, FloraHolland, Koper Automatisering, Van Aken Automatisering, Ctac, Florilog, Frugicom and Florecom.


LetsGrow.com invests in new servers


www.LetsGrow.com not available on Saturday, September 17


For some time we are preparing a transition to new, powerful servers for LetsGrow.com. The main aim of the new servers is that we can meet the increasing number of subscribers. We also want to increase performance in order to speed up the data access and applications for our customers. In addition, the new hardware opens the opportunity to develop additional applications and services.


Meanwhile, the new servers are purchased and installed. The following week, various tests on the servers will be performed. On September 17 the software will be moved from the old to the new servers.


We have evaluated different scenarios for the conversion. The LetsGrow.com databases are of substantial size, hence the transfer from the old to the new servers will take some time. To minimize risk of data loss and to avoid complex procedures, Friday evening, September 16 and Saturday, September 17 www.LetsGrow.com is unavailable for customers.


As far as we can see no data will be lost during the time that LetsGrow.com is not available due to the fact that most devices can buffer data locally.
We will try to perform the transition as quickly as possible and expect that somewhere during September 17 LetsGrow.com all functionality will be available again.


If you have any questions about the above then please contact us via This email address is being protected from spambots. You need JavaScript enabled to view it..


The LetsGrow.com team


Conditional E-mail notification

With LetsGrow.com you can automatically email graphs, charts and data export to different email addresses.
Whether you want to send a single email or wish to send a daily email on a selected email address or even multiple e-mail addresses, there are many possibilities.

The Email notifications are now extended with conditional mail. You will receive an email if certain conditions are met.
For example, you can get a message when the RH has fallen below a certain value.

The graphs and charts send via email notifications can also be viewed on your phone or iPad.

You decide when and to whom you send the emails. You can send an unlimited number of emails.

Read more in the manual.


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The Netherlands
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