"TQ" wrote after "Jasbird"wrote
I have an allotment with clay soil. What vegetables can I reasonably
grow in it what which vege should I not even try?

So far I have onions, parsnips, beetroot, raspberries and strawberries!
The beetroot did well last year (the parsnips not so well) but I didn't
give my gardening serious effort. I shall work harder this year, but
don't want to waste my time trying hopeless cases.

For instance:

Can I grow sweetcorn, tomatoes, spinach (beet), leek, lettuce in the
clay soil?

I also have pumkin, melon, courgette, squash, beans, turnips - but will
probably grow them in my back garder which has rich loam in it.

I garden in heavy soil where rainfall is limited during the summer and
have
found that most things, with the exception of root crops, grow well if
adequate soil moisture can be maintained. Over time, you can
inexpensively
improve the tilthe, friability, and fertility of your clay soil by adding
decayed organic matter.

The only root crop we found unable to grow well was Swede, we overcame that
by growing the seed in Rootrainers and planting out as young plants down to
the first true leaves. Carrots we had a problem with until we found the
"Long Red Surrey" or "Chertsey" variety** but I suspect that was another
problem.
Beetroot, turnips, mooli, all grew well planted direct.

** available from Thos.Etty Esq http://www.thomasetty.co.uk/
--
Regards
Bob Hobden