One of the best perennial plants for growing in moist soils is Joe-Pye weed (Eupatorium purpureum). However, this native can grow to 7 feet tall at maturity, taking up lots of space in your perennial border. A newly discovered Eupatorium species has the same easy-to-grow characteristics and attractive flowers as the tall Joe-Pye weed, but it only grows to 4 feet.
'Little Joe' (Eupatorium dubium 'Little Joe') Joe-Pye weed was discovered by a Pennsylvania nurseryman. The plants have dark green leaves, and by midsummer they are topped with dome-shaped heads of lavender flowers. Not only does the plant grow to a manageable size in the garden, the dwarf stature keeps the butterflies that love to feed on the flowers at eye level for our enjoyment. 'Little Joe' is hardy in USDA zones 4 to 8 and grows in full or part sun.
For more information about 'Little Joe' Joe-Pye weed, go to: Plant Delights Nursery.