Never seen a split like that before man but one thing is for sure the cannabis plant is a resilient plant. I would say to watch the moisture level of the soil around the stem you dont what any rot setting in, leave her alone (you hope) and things should be fine, for the yellowing looks like abit of a nut problem although the plant looks to young to have started feeding any nuts and hopefully the soil you bought was pre-treated with nuts in it, you need to check your soil. Have you sprayed any water containing nut's onto or in the plant. Also it could just be the seedling just getting use to the nut's already in the pre-treated soil if thats what ur using so it could just be stressed out abit from all the nut's it's getting and by just adding water it should just sort itself out. If it were me I would Just give plenty of light and normal water for a while, check the new growth for any signs of more damage or problems if not then great the plant is getting better, remember any damage done to a leaf for any reason will stay like that until the end thats why we look to new grow for signs of problems.
DMC1878 Reviewed by DMC1878 on . stem splitting? Anyone know what causes the stem to split like this? Is it bad? Anything I can do to fix it? Top leafs also show some yellowing. Rating: 5