A new crop marks a new beginning. The foundation for a successful season starts with building a strong and healthy root system. When young plants are placed on the substrate, this is the moment to invest in roots that will support your crop for months to come. If the root system is not properly established early on, growing a uniform and productive crop later becomes much more challenging.

Why roots matter

Roots are more than just anchors. They secure the plant in the substrate, preventing instability and shifting. But their role goes far beyond that: roots absorb water and minerals essential for growth. They also produce hormones and excrete carbohydrates to feed the rhizobiome, creating a symbiotic environment that supports plant health and resilience.

Without a strong root system, plants struggle to take up water and nutrients efficiently, leading to uneven growth and reduced yield and quality. A well-developed root system ensures uniformity, stability, and optimal control throughout the season.

Why focus on roots at the start?

Early in the season, plants have little to no fruit load. This means assimilates—the sugars produced by photosynthesis—are directed primarily to root growth rather than stems and fruits. Once fruit development begins, assimilates are diverted away from roots, limiting further root expansion. In fact, during production, only about 15% of assimilates go to the roots. That’s why the start of the season is the best time to build a robust root system.

What does a good root system look like?

An ideal root system is evenly distributed throughout the entire substrate—from top to bottom, left to right. This minimizes competition and optimizes growing conditions. Healthy roots are white-ish, highly branched, and full of growing tips, which are crucial for nutrient uptake. Root hairs and microbiological life around the roots further enhance absorption and protect against diseases.

How to create strong roots

Building a strong root system requires careful planning and monitoring. Here’s how to do it:

• Start with a saturated substrate: Ensure the substrate is well-prepared before planting.

• Initial irrigation shots: Help roots penetrate the substrate.

• Controlled dry-back: Begin reducing water content gradually—around 1.5% per day. This encourages horizontal root growth and full substrate utilization.

• Target water content: For example, start at 85%, reduce to 60%, hold as long as possible, then increase slowly to 65%-70% when fruits begin to swell.

• Avoid rapid changes: Drying too fast forces roots downward, limiting distribution. Increasing water content too quickly can stress roots.

• Maintain stability: Once the target water content is reached, you are ready to control the rootzone for the rest of the season.

The benefits

• Better root distribution: Roots spread throughout the substrate, reducing competition for water, nutrients, and oxygen. 

• Improved uniformity: Even root distribution ensures consistent availability of water and nutrients.

• Greater control: Uniform substrates allow growers to adjust parameters more effectively, improving management of key factors like WC, EC, and dry-back. 

• Resilient crops: A strong root system supports balanced growth, better fruit quality, and higher yields.

Plan ahead and monitor closely

By investing in root development early, you set the stage for a balanced plant, uniform growth, and optimal control throughout the season. Use data and measurements to track water content and EC, and adjust your strategy based on real-time insights. This proactive approach ensures your crop has the best possible start.

The information provided by Saint-Gobain Cultilene has been compiled with great care and is intended solely as a guideline for the user. Saint-Gobain Cultilene therefore cannot guarantee any errors and no rights may be derived from the information or advice provided. The user himself is responsible for checking the accuracy and suitability of the information and advice for application. No commercial use may be made of the information and advice provided by Saint-Gobain Cultilene, in whole or in part, without the written consent of Saint-Gobain Cultilene.