Posted: 25/08/2013 at 20:00
Hi, there's certainly plenty of snails around, though I have been trying to keep them at bay. There are a few holes in the leaves, but I don't think it's bad enough to explain the petals falling off so quickly. I think the soil is OK (the dahlia is in the ground), but it doesn't get an awful lot of sunlight, so perhaps too much shade is to blame?
As for feeding, I've sprinkled some general purpose fertiliser around it a few times every few weeks, the last time being a couple of weeks ago. I try to work it into the soil a bit, though not too deeply for fear of disturbing other plants.
Could it just be a dud plant? I did plant two tubers. This one appeared very late and the other never appeared at all, and was in a better spot for sunlight.
I think I may have over-watered the soil initially. So then I took to being more conservative, though it rained solidly last night so the soil is certainly wet now. The leaves are firm and dark green. No wilting or signs of being too dry or diseased.
I thought everything in the second photo looked quite healthy? It's just the petals falling off too quickly.
The fertiliser is Aldi's Growmore, which claims to be NPK 777.