Posted: 09/01/2013 at 09:59
Thank you all for your advice and comments.
I won’t lust after a greenhouse quite so much knowing they can have the same problem.
I think poor ventilation is part of the problem, as I was opening the top and doors on a daily basis, but during a very wet spell I thought I needed to keep the plants protected.
Most of the damage is on the top shelf, where the condensation has been forming and dripping back on the plants.
I will make sure I keep it open unless it gets very cold.
I can see a warm windowsill maybe be a good option and will look at using them in the future.
Sotongeof, the plants are mainly fuchsia and scented geranium cuttings I took in the autumn, which were all doing well until I stopped opening the lid!!! I also have a variety of plug plants mainly perennials that I was bringing on ready to plant out, plus quite a few strawberry plants which are on lower shelves which aren’t so badly affected. The plants worst hit are nemesia, perhaps I should have left them out to fend for themselves? They are so say hardy.
It’s my first winter with a wooden grow house so all a bit of an experiment