BTW the heat-retaining black plastic tray didn't help. Start seedlings under flourescent lights whenever possible. It is easier to monitor their health and notice problems before they progress past the point of no return. Outdoors under direct sun, you might leave them in the morning and return to find them dead by dusk. Once you 'learn the plant', you will be able to judge when to put them outside, and how to manage them. Rockwool outdoors isn't going to work in 99.9% of cases. It requires frequent waterings (like every few hours frequent) to stay moist in hot weather.
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