I puchased 150 onion sets last year 50 white ball onions and 100 early summer crop onions .
All were supposedly heat treated to reduce the tendency to bolt.
almost all of the white ball onions have bolted about 20% of the Sturton giants have bolted .
It is I suspect down to the mild winter and then a short sharp cold spell in mid Feb then dry for a fortnight and a very wet March , April & first half of May .
Nature has fooled the plants into thinking that a spring growth period occurred followed by sharp cold winter & now summer has arrived , because they are biennials they have flowered in what the onion thinks is their second year .
All is not lost with these bolted onions you can boil them with carrots and other root veg aqnd freeze the result for using in soups in winter , you can also make gallons of stock and freeze or high pressure can /bottle sterilize it in a sealed sterilized jar .
you can soften them in the frying pan or a dep heavy pan with a knob of butter and freeze them in ready to use portions for hot dogs , burgers and of course adding to gravy's.
I used garden lops and cut the tops of these flowering onions , eased the plant out the bed taking care not to disturb other nonflowering onions and left the bulbs to ripen for a few days on a wire screen .
Tomorrow they get processed one way or another , the best white bulb'd ones will get put on the mandolin slicer and end up as fine sliced raw onions either in gazpacho soup or raw in pittas with the kebab type salad , wrap with a medley of thin sliced veg and perhaps some fines chopped chicken breast , ham or even slightly spicy dry beef or pork mince as a Mexican style dish or on a plated salad .
If your fridge can hold 3 oC they will keep sliced for three or more days if covered in cling film .
If you wash the cropped onions & trim off the roots they will keep a week or so in the crisper drawer in a poly zip lock type bag with a drop of cold water to feed them .
A few stood in an inch or so water in a jug in the fridge will also keep for a 10 days or so but you need to change the water and jug as well as rinse off the onion under cold running water every three days to stop thing s going slimy .