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Hardiness Zone Map


Clethra

Summersweet

<i>Clethra alinifolia</i> ‘Hummingbird’

Exhibiting the four-season fanfare of its deciduous eastern U.S. relations, this adaptable low-maintenance Clethra offers additional enticements: a more compact, smaller scale habit plus nearly twice as many blooms! Shiny serrated dark emerald foliage hosts the abundant summertime creamy-white flowers. Cherished by butterflies and bees, dazzling nectar-rich 4 to 6 in. long blooms form upright, close-knit cylindrical spires that waft a delectable spiced-honey scent. Autumn brings glowing golden-yellow leaves, while the densely woven brown branches etch winter’s landscape and persistent dark cocoa-hued seed spikes nourish songbirds. Appreciative of bright shade coupled with somewhat acidic, moderately moist sandy soil, ‘Hummingbird’s winning rounded character is tailor-made for containers, streamsides, shrubby borders, massed plantings or woodland gardens, where it heroically abides clay, deer and full shade as well as wet conditions.

 

Blooms July–August

Size: 2' 0" – 4' 0" high x 3' 0" – 5' 0" wide.

Zone 3b/4.

<i>Clethra alnifolia</i> ‘Ruby Spice’

A friend to gardeners, butterflies and bees alike, ‘Ruby Spice’ celebrates a compact well-groomed visage plus long-lasting bottlebrush-like rosy-pink flower spikes that sweetly perfume the dog days of summer. Lustrous, deep green serrated leaves develop yellow, gold and chocolate autumnal hues, while the delightful narrow upright panicles morph into intriguing dark brown seed capsules. Discovered in 1992 as a sport of Clethra alnifolia ‘Pink Spire’, this winsome deciduous cultivar exhibits outstanding easy-care versatility, tolerating both full sun and full shade. Whether massed, displayed as a specimen or hedged, it is invaluable for patios, smaller spaces, woodlands, cottage gardens and mixed borders.

Blooms August–September

Size: 4' 0" – 6' 0" high x 3' 0" – 5' 0" wide.

Hardy to zone 4.

<i>Clethra arborea</i>

A resident of the Madeira Islands, this winsome evergreen is densely attired in lustrous coppery green 4 to 6 in. long leaves. Copious small white fragrant flowers, resembling Lily-of-the-Valley blooms, embellish large showy rose-tinged panicles that cluster at branch tips from summer to fall and sustain our interest with round long lasting auburncolored seed heads. Tailormade for narrow sheltered spaces, Clethra arborea's wellgroomed upright frame requires protection from hard freezes and savors moist, freely draining acidic soil.

Blooms August – October

Size: 15" – 20" high x 8' 0" wide.

Hardy to zone 8.

Just like candles on a birthday cake, the larger, more upright flowers of this superlative Michael Dirr selection are a splendid sight. A glossy late spring flush of tooth-edged leafage in emerald hues sets the stage for the abundant creamy white flowers. Made even more dazzling by their spiced-honey scent, the 6 in. long blooms form nearly horizontal, close-knit cylindrical spires.

In autumn, foliage matures to a pleasing yellow. Strongly vertical, slightly downy brown branches and persistent seed spikes etch winter’s somber landscape. With a compact mounding habit, this Clethra offers a winsome presence in small spaces, and is a choice feature for a patio pot. Give this easy-to-grow shrub moist, slightly acidic soil and, where summers are hot and dry, shade each afternoon.

Blooms late June–July

Size: 2-1/2' high x 3' 0" wide.

Hardy to zone 4.

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Current Staff's Favorite Plant

Current Staff's Favorite Plant

Our feature plant: Primula vulgaris ssp. sibthorpii

Precious Primulas, Prized Pulmonarias and Fabulous Foliage!

Primulas offer elaborately-crafted colorful blooms in varied shapes,……

including draped bells, candelabras, drumsticks and pincushions. Many Primrose flowers  waft a delectable scent. Second-to-none for the dappled recesses of your garden, these easily grown, cold-hardy Primulas crave well-drained, humus-rich niches with adequate moisture and good air circulation. They can grace containers or be planted in swaths along shady walkways or in woodland gardens. Be sure to peruse our online Primulas.

Prized Pulmonarias……

One of the earliest perennials to bloom, you can be picking their enchanting urn-shaped flowers in February while the rest of the garden still slumbers. Many cultivars showcase an array of mercury-hued dapples, speckles and spots, while others sport solid pewter sheens or striking silver streaks. Easy-to-grow Pulmonarias prefer the lacy light of a woodland setting plus cool moist soil. Our newsletter also includes a handful of other shade-loving perennials that promise alluring foliage. Many of these perennials can be partnered with Pulmonarias for intriguing foliar contrast. You may wish to check out our online Pulmonaria offerings.

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