Thanks
well i think a few things are going on here, definitely environment issues- temp humidity, root issues, possibly rot from overwatering.
pests..
looks to be a monster cropped clone reverting back to veg.
take a pic of the whole plant and post ..
Thanks for the reply.
It's quite possible that this cutting was from a clone that was brought in from outside a bit late and had reverted to your monster cropping comment is very observant.
The medium is canna professional and I'm quite careful about overwatering so I'm not sure that is a factor.
Mites could be an issue. I have sprayed them with super shield.
I had a similar issue with a small number of clones of a different strain in the past. Most were fine but a few took on this hardening of the tips. These clones were definitely not monster cropped which might rule that out as being the defining factor.
They are in a converted freezer and I have only just got the temp at a steady 25 degrees so that could be a problem.
I can't for the life of me find pics of anything similar online which suggests this isn't a common occurrence.
Will flick through another pic shortly.
Cheers