the tap root is very fragile and the holes in rock wool are small and kind of coarse so use extra caution.

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karmaxul Reviewed by karmaxul on . Trouble getting seeds to start So I ordered some seeds from Nirvana and I am having trouble getting them to do much of anything. I know it is something I'm doing; I just donā??t know what it is. I bought AK-48, White Widow and White Rhino. I can get them to germinate using the paper towel method, but I have moved them into the rockwool cubes and I get nothing. They have been in the rockwool for almost three weeks and I see nothing. The rockwool is in a tray with a humidity dome over it and a heat mat underneath. Rating: 5