well.. add as much as you want, some people use 50/50 perlite and compost, some only use a little perlite... it varies.. my advice would be to measure out 3 different ratios of compost and perlite, record which one does best for that strain, and use the mixture you most like for your 'serious grow' when summer comes around then you can grow the other 3 much better, and it will keep you interested... good luck..

p.s. watch the temps at night if your growing in a greenhouse...
Abattoir Dream Reviewed by Abattoir Dream on . Second grow attempt need advice Hey guys THis is my second grow attempt as my first one lasted 1 month, well i got 6 vvery nice bagseeds good sativa high and i just went out to buy some supplies i got just a nice bag of regular compost and "perlite" I was wondering how do i use perlite, i have heard of it being used but can anyone give me a recipe to add it to my soil to get a nice foundation for growing, also it is winter here so i know a bad time for growing but this is just something to pass the time like semi-serious Rating: 5