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Perennials are plants that live on year after year if the conditions surrounding them are congenial. Trees and shrubs are perennials, of course; in these the stems are woody, but we are considering only those known as herbaceous perennials, having stems of a more or less soft texture that, with the exception of a few evergreen species, die With a few exceptions, perennials are not long-lived. The gas plant, peonies, some of the iris, day lilies, and a few others, seem permanent. The usual rundoi:10.5962/bhl.title.29267 fatcat:d2fuchg6sncofdz6tj5uoei674