"Peter Smith" wrote in message ...
I have grown these for the first time this year. They are doing quite
well,
but many of the red ones are producing seed heads. I have removed these
but
will the onions still form OK?

Yes they will form onions but they will have the old flower stalk in the
middle of the bulb so won't store well (not that Japanese Onions are the
best storers anyway).
Best used first, indeed if you have many of them then start to use them as
soon as they are big enough, don't wait for them to ripen etc.
Talking to an friend recently and he is also having your problem as am I, so
this excessive bolting of onions seems to be a thing this year. I wonder
why?

--
Regards
Bob

Some photos of my plants at.....