Rosehips

@Cocomero, Thank you for the reply, as it's my first grow I was thinking should I be worried at the black at the base of the leaves & the buds turning black, as the other plant from same seed batch is as expected green. So feel relieved now, & your plants do look nice & healthy enjoy your harvest :grinning:

@Rosehips, Hi. The plant with the black leaves is a CBD kush auto Dinafem and what you see is its classic natural color. However, some green gelato auto RQS are developing flowers with dark colors tending to black. Now place the photos from the eighth week where you should better notice the detail of the plants. I'm feeding the frozen greens only with an RQS organic fertilizer, so they shouldn't have any excess fertilizer, or at least I hope !!

@Rosehips, too much nitrogen likely. Hard to tell without seeing. But darker the shade green the higher your nitrogen level is. When it's dark green your on verge of nitrogen toxicity. Then leaf tips claw down.