What size rockwool will be best for s thick stem and sturdy support. I'm trying the kratky Hydro system. I e Bern using 1.5" cubes. Plants don't want to grow very tall. Thin stems also.
Rockwool cubes dont usually cause growth issues. What size net pots are you using? And any other growth related issues, discolouration, spotted leaves, drooping etc. Snoochie Boochies!
rock wool won't determine your plants health or how thick the stem is. When posting your sick plants questions ^^^here ya go^^^ its more than likely the thing stretching plant you have is do to a poor lighting setup. why are you trying the kratky method? go buy a 12$ air pump.