'Blue Diamond' ( Rhododendron 'Blue Diamond') Blue-lavender flowers in spring and early summer a dwarfish plant that is hardy in zones 7 to 9.'Bob's Blue' ( Rhododendron 'Bob's Blue'): True blue flowers in spring hardy in zones 7 to 9.PJM rhododendron ( Rhododendron (PJM group): Lavender-pink flowers in April hardy in zones 4 to 8.
Catawpa rhododendron ( Rhododendron catawbiense): Lavender-pink flowers from April to early June hardy in zones 4 to 8.Rhododendron cultivars with blue or lavender flowers are widely grown popular varieties include: Most native species come from east Asia and the Himalayan region, but they also hail from North America and Europe. Rhododendrons and azaleas are in the same family-both come in deciduous and evergreen varieties. It has a long flowering period, from June into early fall. This cultivar typically grows to 6 to 12 feet, but heights of 15 feet are possible. Some experts recommend cutting the plant down to ground level yearly to keep it under control.
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If not planted in full sun, it can get weedy and sparse. It grows well, not requiring much maintenance beyond controlling its overgrowth. It grows best in USDA hardiness zones 5 to 9. Although it attracts butterflies and other pollinators, it is only a host plant for non-native North American butterflies and caterpillars, crowding out native host plants. around 1900 and is considered a weed or invasive plant in at least 20 states. The beauty of 'Blue Chip,' beyond its color, is that it is non-invasive.īutterfly bush originally came to the U.S. The Adonis Blue cultivar of butterfly bush is a true blue.Ī few cultivars of butterfly bush ( Buddleia davidii) have true blue flowers, such as 'Adonis Blue.' Others have misleading names, like 'Blue Heaven' and ' Blue Chip,' which are more of a lavender color than a true blue.
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