This plant (Rose Campion)is classified as either a perennial
or a biennial in a number of books. Is there an official source on what
a plant is? A web site that is the final authority on whether it's a
perennial or not? Or can a plant be classified as a biennial perennial?
There are plants which are perennials treated as biennials. But I
wouldn't have put Lychnis coronaria in that category. The classic
example is Digitalis purpurea (foxglove).
Some plants are monocarpic (that is, like annuals and biennials, they
flower once, but take more than two growing seasons to reach flowering
size). The best known examples are some Meconopsis (which, however,
aren't consistently monocarpic) and Cardiocrinum. Lychnis coronaria
definitely isn't monocarpic.
I would call Lychnis coronaria a short-lived perennial, but I might be
misled by its relative intolerance of winter wet.
Stewart Robert Hinsley
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