I am having problems with my lobelias. After germinating they have seemingly stopped growing. They are only half a centimetre high and have remained so for a week or so. My alyssums on the other hand are thriving
Are these bedding lobelias like these? http://apps.rhs.org.uk/plantselector/plant?plantid=1182
I've noticed in past few days everything has slowed down and I think it is the cold.
Yes, they are Upright Lobelia (Crystal Palace)
I agree, the cooler spell has slowed things down a bit but hopefully, from today things are going to warm up a bit.
Also, if your seedlings are still in their seed compost they'll need pricking out/potting on into some compost which has a bit higher nutrition (seed compost has very little) as soon as they're large enough to handle - I would use John Innes No. 1 loam based.
My lobelias, after germinating two weeks ago, are still not growing.