My vegetable plot is to the north of my house and is shadowed much of
the day from direct sunlight --- house, garage; garden wall, neighbours
trees, ... But none of it is under trees or affected by roots.

Now (March 19th, with not a cloud in the sky) some of it may get direct
sun for only an hour or two, other parts not at all, and about half of
it four hours or so.

What effect has shadowing on plant growth --- say potatoes, broad beans,
carrots?

How does do the effects of shadowing compare to the effects of cloud
cover --- which, in north-west Ireland, we can expect a lot of?

Best regards,

Jon C.