Geezer, my first year with Heritage White. I harvested the bubils about the middle of June, Left the onion stalks still standing, grass/weeds took over. I mowed everything down and walked away...Now, everything that I left in the ground has sprung forth abundantly, everywhere there was a set in the ground, there now is another fairly good sized bulb with the original one which is decomposing, additionally there are 8-10 sets/scallions popping up.
I have pulled several of these clumps up separated the scallions out and consumed them, they are mild and very good.

Adds new meaning to the term "multiplier".

Wayne

From the looks of things, those bulbils won't dry on the stalks. Stalks died a month ago and the bulbils were green. Cleared out the dead stuff and cut off the bulbils. New plants are up over a foot tall but the two quarts of bulbils are still almost as green as when cut off.

Martin

can you tell me if catawissa and the heritage multipliers are the same ?

Catawissa have red or brown bulbs and bulbils. Heritage Sweet have white bulbs and bulbils.

Martin

Heritage Sweet White multiplier onion sets should be planted 1 inch
deep 4 to 6 inches apart. If you wish to increase the
white section of the plant for harvesting as table
scallions, the soil should be mounded around them as
they grow to a depth of about 3 or 4 inches.
In mid summer, the leaves will begin to die back from
the tips and start to fall over with top sets on the
stalks. At this time you should stop watering. Within
a few weeks, the bulb lets or sets will be ready for
harvesting. Dig them after the leaves have turned
yellow and brown and remove the top sets and replant.
Do not cut the stems at this time. Let them cure in a
warm dry spot until totally dry and the outer skin of
the bulb has turned to a papery feeling. At this time,
the stems can be removed to within one inch of the
bulb and the onions can now be stored in a cool dry
place at 34 F or grater for eating or planting.
(from original planting directions)
Coho

Does anyone have a start of the Heritage Sweet White Multiplier Onions to share? I replanted mine when I moved, but they all died! I would be happy to pay postage. If you can help, my email address is: d.mccollumn@gmail.com

Geezer, you need not do anything. The topset onions don't mind being crowded. If you wish you can harvest scallions now and not need to wait for spring, just don't overdo it. Either way they very likely will be less mess next spring than you are afraid of.