frost tolerance of mature onions
This year I have the chance to leave the water off the onion patch in hopes of some natural drying down. Normally the tops don't dry down at all as we have to harvest before the ground starts freezing with the first heavy frosts in early September.
But I began wondering what the frost tolerance is of mature onion bulbs and have not been able to find out in my books or online searches yet. Any ideas from you guys ?
I have been trying every year to plant the starts more shallowly so the bulbs have more room to grow. But now I am thinking they are less frost tolerant that way, with the bulbs part way above the ground...
The water has been off of them for 2 weeks now and they aren't showing any sign of drying down. We have had 2 nights of 30 degrees and I put row cover over them to protect the bulbs.
Normally we just pull them in late August and hang small bundles over the gates in the barn for a month to finish the drying process.
Thanks for any ideas, Jean in Mt