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Any chance they would have time to develop?
I would not bother. They are very slow growing, so unlikely to produce a worthwhile crop.. Might be better to use the ground for something more productive. Still plenty of time to sow some crops. How about Florence fennel? Sown late they will often stand well into autumn. Plenty of alternatives.I don't think the warm weather was the problem. I think the cold early weather was the trigger. Once they have had enough cold exposure, they seem to have a mechanism that makes them behave as if they have already been through a full winter. Then it is just natural biennial plant behaviour to run to seed.
I'll give the seedlings a go, will only need one of the two "boxes" and can grow something else in the other..