Chemically

In general the trend is that most growbags are unwashed (like for tomato and pepper crops) or washed. For more delicate crops, like strawberry, the experience is that the yield is better with buffered material and even better with Shakti Amla®.

Plastic

If not requested otherwise, plastic is white outside and black inside. The white outside reflects the sunlight and helps against excessive temperatures in the rootzone. The black inside keeps the rootzone dark as roots prefer the darkness for their best performance. Different types of plastic are available:

• 300 Gauge with 1 year UV-stability
• 350 Gauge with 1 year UV-stability
• 400 Gauge with 2 years UV-stability
• 500 Gauge with 3 years UV-stability

Physically

Growbag mixes can be made with coir pith, coir crush and coir fibre. Most common are the mixes with coir pith and coir crush. Crush can be the standard 0-15 mm or the finer 0-7 mm. Equal mixing is essential for consistent growbags. The more crush being mixed in a growbag, the dryer the growbag which means a lower water content and a higher air content. Dry growbags need more during daytime but are easier to dry during night time.

Besides standard sizes a wide variety on sizes are available between:

• Up to 120 cm long
• Up to 40 cm wide
• Up to 20 cm high

Plant,- drain- and dripper holes

On request plant holes can be cut in the plastic for easy transplanting of planter blocks with young plants. If plugs are being used the plant holes can be drilled in the coir up to a diameter of 5 cm.
Dripper holes of 6 mm diameter can be drilled in the coir for easy placing of drippers in the dry material. Free drainage is at least as important as irrigation. Diamond-shape drain holes can be cut in the plastic.