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Sweet pea sowing

in Plants
I brought some sweet pea seeds back before Christmas but never got round to sowing them. I plan to sow them in toilet roll inner tubes so I don’t disturb the roots, but when would be the best time to do this? I also intend to leave them in an outdoor cold frame/greenhouse, will this be okay? Any advice would be great
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I normally sow my second lot in early February.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
They shouldn't be cossetted in any way, and it should ideally take them around two to three weeks to germinate. Then you need to work out the best time to plant out.
For me, it's not worth doing that any earlier than May. April is too cold for them to do anything.
The only way to find what works for you is to experiment.
I live in west central Scotland - not where that photo is...