Sure it's only a tiny seam in the concrete, but field milkweed
(Asclepias syriacus) begins as a tiny seed that develops a
tenacious, running root. Once it has laced its roots throughout the
soil behind the wall it becomes a bank of buried starch energy.
It'll take many killings or pullings to make it sprout its last. A
plant that can fill this niche and be so healthy amid heat and
fumes is a tough one indeed. No wonder milkweed is so tough to
control in gardens where it isn't wanted.
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