Lobelia/pelargonium seedlings in an unheated greenhouse?

[Ananke]

Some of my lobelia and pelargonium seeds have germinated and they are on a window ledge at home. Is it safe to move them to an unheated greenhouse? I've bubble wrapped the sides of the g/h but not the roof and I have more bubble wrap and some fleece as well if that helps. Trying to make some space.

Thanks

[Thelma Sanders]

Bearing in mind where you are, I really wouldn't chance it - the pelargoniums, especially, are very tender.

[Ananke]

Thanks Thelma. Is it low temperatures in general or actual frost that would be the issue?

[Thelma Sanders]

Low temperatures rather than frost

A half hardy perennial, Geranium seeds should be sown between October and March for flowers during May and October the following year onwards (some plants will flower during the first year).

Geranium seeds should germinate within 3 to 21 days. The seedlings need to be transplanted singly into 75mm pots and grow on maintaining a minimum temperature of 15°C. The Geranium plants need to be acclimatised to outside condition before planting out at 30cm apart, in an open sunny position.

Quality Geranium Seeds from Suttons Seeds

[Ananke]

Thanks Thelma, that really helps

[rary]

You could be ok in an unheated greenhouse in some parts of Glasgow as some areas have a micro climate of their own, but I would cover them every night with fleece, and a thicker fleece than normal or a thin one doubled over

[Ocelot]

I always take my (mature) pelargoniums inside for the winter. When I've left them in an unheated greenhouse they've mostly died or become riddled with botritis.

[Madasafish]

I always take my (mature) pelargoniums inside for the winter. When I've left them in an unheated greenhouse they've mostly died or become riddled with botritis.

I have overwintered some successfully by cutting down stems to approx 5cms, removing damp composts and placing on a seed tray and covering the roots with dry compost. And then covering the tops with fleece. In Spring, spray with water so compost is just damp after removing fleece..

Unheated over winter greenhouse..

BUT it's messy and you lose approx 50%... So I've given up now ...and buy seedling plants cheap from T&M and heat greenhouse from March.