Three years ago I purchased Mary Washington asparagus seeds, a variety that is hardy enough for zone 6a, from Rare Seeds. I followed their instructions and all seeds sprouted! I dedicated a whole bed for it, but I didn't plant all 25 because there was no room for them. I planted 12 of them and I gave the rest to a friend.
The first two seasons I did not the harvest any asparagus spears because you want to develop a strong root system. The first year I saw the ferns grow to be about four feet tall and the asparagus spears grew to about two feet tall. The spears were too thin, though. The first fall, in preparation for the New York winter, I mulched the bed heavily with straw and hay after the fers had died back and I cut them to the ground. The second summer the spears looked much stronger and got really tall. There were spears that were as tall as I am, 5' 10", however that's not a reliable measure because I've been shrinking stradily, but I digress.
That following late fall/early winter again I mulched the bead heavily after the ferns had died back. During both winters we got a considerable amount of snow, but the plants survived and proved that this variety is indeed very hardy.
During both summers the ferns got to be so tall that I had to devise a method to hold the ferns upright and not falling on the ground and possibly breaking. I wanted the asparagus to benefit from the sun's energy. Here are a few YouTube videos that I created for my asparagus:
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