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There are no plants in Alberta that are grown for "stem."
Cotton, fibre flax, hemp
potatos are grown in zone 3 which is in Adelaide, South Australia
No.
what is the plants have no stem
The Wild Rose is grown pretty much everywhere in Alberta, and is found everywhere, if you know where to look.
they are grown in a magicial field in unicorn land
Maybe because it is grown with the long thin leaves or because it was no fertilized
maybe yes maybe no Sure, Tapioca plant can be grown from a piece of stem provided, (1) the stem is from a full grown plant and (2) the bottom portion of the cut piece of stem is planted in the soil.
Alberta
Grand Prairie
Not naturally, but rosemary can/might be grown in greenhouses. i think