Rockwool needs to be pH'd to 6 before use. It is hydroponic, so subsequent waterings/.feedings also need to be adjusted. Once you transplant to soil, that changes. At that point, give pH 6.7 feedings. It also contains NO nutes whatsoever, and you'll want to start feeding at a 1/4 strength (or less to begin with) grow fert. They look scorched from heat and need to be taken care of more often at that age, especially in bright sunlight.
stinkyattic Reviewed by stinkyattic on . WTF IS WRONG WITH MY BABYS!? i am currently growing about 70 seedlings in rockwool cubes untill i buy some pots to transplant them to, for a while they were growing nice and green, but fairly slow, at first i thought i was overwatering but now i think i might be underwatering, some of the plants around the edges are growing the same they were before but alot of the plants in the middle their leaves have shriveled up, turned brown, and are crispy, they are in a field with no trees around and they get light all day long can Rating: 5