Depends on how risk adverse you are. I have planted out my French Marigolds as I started them too early in Feb, so are flowering now. My Dahlia, Gladioli, Freesia etc have been outside for a month or more. I left my Cosmos in the greenhouse but potted them up. I would put out Rudbeckia but not Nicotiania. South Coast and last week of April - I would plant out what you feel like.

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thank you kildermorie, I'll give it a 50:50 risk plant some out and keep some in greenhouse just in case!

I planted mine out last week, I live in the south east

I planted some Busy Lizzies out last week, gladi corms went out weeks ago. I live in Cornwall, very close to the sea.

plant out but a late frost will be an expensive re run to the gc for replacemnets.
cosmos seeds have only just gone in the soil but I am in east Yorks.