Thanks for sharing! I'm writing a post for tomorrow that features sweet potatoes along with 10 other vegetables that can be grown as perennial greens. The leaves of a lot of varieties of sweet potatoes can be harvested and eaten as a cooked green.
In my area (zone 8) there are sweet potatoes that will overwinter and come back each year. I'm planning on growing some as a perennial root/greens crop.
I am in Wales in the UK. My climate can't be too far off yours in Washington. What is the variety of the overwintering sweet potatoes? I would love to try those in the UK.
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Thanks for the resteem. Hope my post helps. Up here in NE Oklahoma sweet potatoes often overwinter, but you can't count on it after a bad winter. Also, I think there are less problems with root rot after starting with a new slip in the spring. Look forward to seeing your article.