no it wont cause stem rot, just make sure you dont overwater and have good drainage from that cup, would wait a week or 2 before you transplanted
bejay Reviewed by bejay on . leggy seedlings w/plenty o' MH Hi. I've got some unexplainable leggies. 1 week old big bud seedlings. been 18" below a 250MH @ 70 - 80 deg 50% humidity ever since planting. The temp has dipped a few times to mid 50's. Leggy as ****! Fresh soil Bulbs about 6 mo old/ agrosun. This is the leggiest one Rating: 5