Very handsome "trendy" perennial especially helpful by lending a dusky rich purple foliage foil to a gold & white Hosta planting. "Purple Japanese Celery" is also successful as a bog plant, the rather oddly formed buff pink blushed white flower sprays (nearly umbels) appear late summer--every butterfly in your garden will make a pilgrimage to the feast. To see it is to want it. Winter hardy at least to the Arctic Circle; we cannot safely say it will survive the seasons further north than that.
Some of you grow only indoors, some only in terrariums; many of you have hobby greenhouses; while a growing number of customers live in subtropical or tropical areas of the world. These brief codes are an attempt to suggest whether or not a particular plant will do well in your particular conditions.
If an entry has the cluster HP CGH, this means normal house plant culture will be successful if the plant is given a cool CGH moist location; however if the entry has the cluster CGH HP, you would interpret this to suggest that while Cool Greenhouse conditions are needed for total success with this plant, House Plant conditions will be adequate, while not ideal. If the cluster is HH CGH you would interpret this to mean that while in Zone 8 or below this will be winter hardy outdoor, further north it will need considerable mulch, a cold frame, or a Cool Greenhouse to thrive. And so on.×