I am wondering can you grow a pluerry in zone 5? One Green World has sweet treat listed as zone 4 but the rest as zone 6. Everyone else seems to list all pluerry as zone 6+.
A lot of nurseries will just put the same cold hardiness for all the same kind of plant, either to protect them selves from complaints when they don’t know how cold hardy they really are. Some nurseries will exaggerate how cold hardy a plant is to sell more plants, I myself have not tried to grow any pluerry
Here is another one that is said to be zone 4 Candy Heart Pluerry™ Interspecific Plum Tree For Sale | NatureHills.com
The same nursery says that Sweet Treat is zone 4 Sweet Treat Pluerry™ Tree For Sale | NatureHills.com
Nature Hills is zone 5, you could try contacting them.
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Sweet Treat made it through last winter for me (Zone 5) and set a couple fruit.
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