I'm not sure what you mean by a nursery bed (in a
greenhouse?), but whatever works for you in a cold climate to get your arilbreds
to bloom is what you should continue doing. What a raised bed does is give
the arilbreds and pure arils good drainage, as in my climate they don't like
their roots wallowing in winter water. I even grow some SDBs and TBs in
raised beds. I think your lack of success with blooms on the ABs in the
past may have been due to the fact that you had them planted in sand, and I'm
not sure they received the proper nutrients in such a condition.
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