With their vibrant red colored blooms in July and August and a strong vertical growth habit, you visually can’t miss with our native cardinal flowers (Lobelia cardinalis) (USDA hardiness zones 3-9). Hummingbirds and butterflies won’t pass them by either. Cardinal flowers are also called scarlet lobelias. Their vibrant red single raceme flowers single them out […]
Archive for the ‘Summer heat tolerant’ Category
Siebold Viburnum Makes Wonderful Small Tree
The genus Viburnum is no stranger to U.S. gardens. Many species and cultivars of viburnums are popular. Siebold viburnum (V. sieboldii) is a large spring flowering species from eastern Asia (USDA hardiness zones 5-7), but is under-planted in today’s gardens. This multi-trunk large shrub to 12 to 15 feet high or 25 […]
Good News About Garden Impatiens
Gardeners no longer have to give up growing garden impatiens (Impatiens walleriana). No, the worldwide disease outbreak of downy mildew on garden impatiens is not over. But new disease resistant cultivars of impatiens are arriving at garden centers this spring. Two of the newest are: SunPatiens® Spreading Shell Pink and Bounce® Pink Flame (‘Balboufink’). […]
Many New Beebalm Cultivars Continue to Roll Out
Bee balms, aka bergamots or Oswego tea (Monarda spp.) are native to eastern North America (USDA hardiness zones 4-9). Plants are easy to grow, bloom beautifully, and multiply rapidly. They are treasured for their raging colored flowers and medicinal properties. Numerous bee pollinators as well as butterflies and hummingbirds favor the summer blooms. The native […]
Wonderful Bellworts For Woodland Gardens
The soft yellow bell-shaped flowers of bellworts (Uvularia spp.), aka merrybells, contribute to spring’s awakening in U.S. woodlands and shade gardens (USDA hardiness zones 3-9). On both U. grandiflora and U. perfoliata, flower stems pierce (pass through) the center of the leaves. A third species, (U. sessilifolia), nicknamed Wild Oats, […]
Less Invasive Rose Of Sharons (Altheas)
In several states rose of Sharon or altheas (Hibiscus syriacus) are classified as exotic (non-native) invasive shrubs (USDA hardiness zones 5-8). Their seedlings are invading U.S. woodlands. Plant breeders are now developing less invasive cultivars. The double-flowered altheas produce far fewer fertile seeds; stamens and pollen sacs are mostly embedded within the flower petals. Azurri Blue Satin® is […]
Million Bells (Calibrachoa)
Among gardeners “million bells” or “callies” are common names for calibrachoas (Calibrachoa x), spring-summer-fall flowering annuals; they’re closely relative of petunias (Petunia spp.). Low spreading plants are blanketed with small petunia-like flowers from spring until frost. Blooms hold up well to rain showers and do not need to be deadheaded. Plants are heat-tolerant and disease […]
‘Blizzard’ Pearlbush Is Superior Choice
Once upon a time pearlbush (Exochorda spp.) was a popular old-fashioned spring flowering shrub. Its flurry of white flowers followed forsythia in early spring bloom cycle (USDA hardiness zones 4 to 8, excel in 7 & 8). New on the garden scene is ‘Blizzard’ (E. x […]
The Forsythia Revolution
In most areas of the U.S., the golden yellow blossoms of forsythia (Forsythia x intermedia) signals that worst of winter weather is almost over (USDA hardiness zones 4 to 8). Over 2-3 weeks bright yellow flowers cover this easy to grow shrub. Priced at under $20, a good-sized forsythia […]

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