At Kwekerij Midberg in Harmelen, substrate choice is an important part of the cultivation strategy. When René Geurts became responsible for the company’s red and yellow pepper crops in January 2025, the 12-hectare red pepper area was switched from rockwool to coco substrate supplied by Dutch Plantin.
The decision was based on René’s previous experience with coco. He already knew the Dutch Plantin substrate and had achieved positive results with it in the past.
“In coco substrate, you can steer root development and plant balance effectively,” René explains. “Once the plant has developed strong roots and is sufficiently generative, you can focus more on growth to support production.”
A strong start below the plant
According to René, the substrate has a relatively fine structure in which young roots can establish themselves well. During the first stage of cultivation, irrigation is deliberately controlled to support a generative plant balance and strong root development.
Later in the crop, more water is supplied to stimulate growth and production. For René, that combination of substrate structure and irrigation control is one of the main advantages of coco.
Positive development so far
The red pepper crop is currently developing according to expectations. The plants are vital and production is progressing as planned.
Kwekerij Midberg also grows 5.5 hectares of yellow peppers, which currently (2026) on stonewool, as that was in his stock when he took over the company. As René is very successful on our growbags for many years he ordered Dutch Plantin growbags for this glasshouse too.
Interested in a similar solution?
The exact substrate specification used at Kwekerij Midberg is not included in the available information. The right coco substrate depends on the cultivation system, irrigation strategy and crop requirements.
Dutch Plantin can advise growers on the most suitable coco substrate configuration for professional pepper cultivation.
