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Garden-related businesses we like:
Avoid buying plants from supermarkets, DIY stores and huge garden centre chains.
Much better to buy them from the people who grow them!
Only then can you be sure of the conditions they were grown in (not somewhere with
a much milder climate than ours, like southern England, Holland or Spain).
The dedicated growers will generally give you access to more varieties as well,
which helps diversity, to the benefit of all.