I didnt, I sowed in spring and treated as any other seeds, get them to big plants before planting out, but then that’s just me, I never sow anything direct.
Gardening on the wild, windy west side of Dartmoor.
How much seed do you have? Maybe try some in pots/trays/plugs and the rest directly in the cracks in the wall. My Dad has some on his wall that self-seeds into the cracks and comes up here in different spots every year. It might be hard to get big pot-grown plants into the walls, depending on the size of the cracks.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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In the sticks near Peterborough
In the sticks near Peterborough