When we think of growing tomatoes, we typically picture rows and rows of tall tomato plants climbing high into a greenhouse. These plant types are known as ‘indeterminate’ tomatoes, and they're great for extending the growing season and producing high yields. In recent years, Philips has conducted trials on various types and varieties of these indeterminate tomato plants in our own Philips GrowWise Research center in Eindhoven. Results have helped us to develop strategies and practices to maximize crop productivity and quality. However, indeterminate tomato varieties come with their own set of challenges. Because they are so tall, they share the common requirement for a single-layer high-wire growing system with wide paths between rows to facilitate continuous labor for crop maintenance and harvesting. In urban areas, where space and labor are a premium, this can become a problem.

To make indoor tomato farming more profitable, we had to overcome two major obstacles: (1) finding ways to make the most of the limited space, while (2) reducing labor costs. And we were not the only ones to acknowledge and address these challenges. Certhon has partnered with HW Seeds and developed a new system, called Gronos. They use varieties of bush tomatoes, which don't need as much maintenance and produce ripe fruit all at once. Walkways can be removed to make room for plants, as workers don’t have to move around for crop maintenance and harvesting. They have found this works well for outdoor production of tomatoes, but how does it work for indoor farming?

We decided to try growing these smaller varieties of bush tomatoes in high-density, multi-layer indoor systems, and harvesting them all at once at the end of their cycle. We conducted several trials to test this strategy and see if it could produce as much fruit as traditional high-wire systems, with less labor. The results are promising. Not only did we simplify the growing cycle and reduce labor costs, but we also found that we could harvest nearly 1.5 to 2 times more tomatoes per square meter per year compared to traditional greenhouse farming. This means we can produce more tomatoes with less effort and fewer resources, making it a promising strategy for more sustainable and profitable indoor farming

The market demands cherry tomatoes that are both high in quality and delicious, but achieving these qualities with dwarf tomatoes has proven difficult. To improve overall quality, our current research focuses on managing key parameters such as fruit structure, taste, and shelf-life. Additionally, we aim to improve the ripening homogeneity of cherry tomatoes so that all fruits ripen at the same rate, making automation simpler with a single mechanic harvest. Unfortunately, many dwarf tomato varieties currently available were originally developed for the decorative market and not for high quality or yield. However, the good news is that more companies in the industry are now investing in this new way of growing tasty cherry tomatoes. With continued research and development, we hope to meet the demand for high-quality and delicious cherry tomatoes in the marketplace.

In conclusion, the approach to growing dwarf tomatoes in high-density, multi-layer systems has shown to be a promising solution for vertical farming that maximizes productivity while reducing labor costs. The focus on improving the fruit quality and ripening homogeneity of cherry tomatoes is essential to meet consumer demand. It is exciting to see how this new technique will evolve to help accomplish this goal.