Cultilene Smart Root Zone Management
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The standard is a hole of 25 x 25 mm for a plug of 22 x 27 mm. To keep the base of the plant slightly higher and drier it is good to use a plug that is 2 mm longer than the hole in the cube. This helps to keep the base of the seedling dry and reduce the chance of infection.
More and more propagators choose a narrow hole of 22 x 27 mm. Direct contact of stone wool creates a faster rooting in.
The most commonly used cube hole size is 30 / 35 mm for the plugs put horizontal (90º) as well as inverted (180º).
There are many hole sizes being used, but a 25 / 25 mm hole type works well. It is important that the seed is not too deep in the cube.