Clethra alnifolia 'Hummingbird'
Overview
Uses: Pollinator gardens, damp and low-lying beds, woodland edges, shaded foundation plantings, mass plantings along paths where fragrance carries.
Benefits: Powerfully fragrant white bottlebrush spikes in the depths of midsummer when most shrubs have long finished, a compact frame roughly half the size of the species, and clean golden fall foliage even in shade.
USDA Hardiness Zones: 4–9
Sun: Full Sun, Partial Sun/Shade
Life Cycle: Deciduous Shrub
Growth Habit: Mounding, Spreading — compact dome that slowly suckers into a colony.
Bloom Color: White
Foliage Color: Green, maturing to Golden Yellow in fall
Mature Height: 2–4 feet
Mature Width: 3–5 feet
Bloom Season: Mid to late summer
Growth Rate: Slow to Moderate
Summary
You will smell this shrub before you see it, which in July is not something many plants can offer.
'Hummingbird' is a compact selection of our native summersweet, and its timing is the whole point. The upright white bottlebrush spikes open in mid to late summer, weeks after the spring shrub season has closed out and at the moment when shaded beds are usually running on foliage alone. The fragrance is genuinely strong — sweet and spicy, carrying ten or fifteen feet on a still evening — which is why it belongs near a walkway, a patio, or an open window rather than at the back of a border.
Where the straight species can reach six to eight feet and get leggy, this form holds a dense dome under four feet. That size difference is what makes it usable in a foundation bed or a small shaded courtyard without annual hard pruning. It suckers gently at the base and will form a low colony over time, but it does so slowly enough to stay manageable.
Bloom is followed by dark seed capsules that persist through winter, and the foliage turns a clear golden yellow in fall — unusual for a shrub that performs this well in shade, where most plants give you nothing in October. Bees and butterflies work the flowers heavily; it is one of the more valuable late-season nectar sources available in a shade-tolerant shrub.
Care
Hummingbird Summersweet Care
Plant in full sun to partial shade. Partial shade is generally the better choice — it produces a fuller plant and keeps the soil cooler and more evenly moist, which this shrub cares about more than it cares about light.
Soil should be moisture-retentive and slightly acidic. Summersweet grows naturally in damp woods and along pond margins and handles wet feet without complaint. It does not handle prolonged drought, alkaline soil, or hot dry exposure, so avoid unirrigated sites in full afternoon sun.
Water regularly, especially during establishment and midsummer heat. Leaf scorch along the margins is the usual signal that the plant has gone too dry.
Fertilize lightly if at all. A spring application of a slow release fertilizer is sufficient in poor or sandy soil. Acid-forming products suit it well.
Prune in late winter or early spring — the plant blooms on new wood, so a spring cutback does not cost you flowers. Remove any weak or crossing stems and thin suckers to control spread. Clethra leafs out notably late in spring; do not assume winter damage before mid-May.
Size
What Size is the Hummingbird Summersweet for Sale Online?
Our Hummingbird Summersweet ships in a greenhouse-grade grow pot and is appropriately sized for its container at the time of shipment. If you have specific sizing or planting questions, please contact us.
How Large Does Hummingbird Summersweet Grow?
Expect a dense mound roughly 2 to 4 feet tall and 3 to 5 feet wide. Growth is slow to moderate, and the plant tends to widen more than it heightens as it matures. Space 3 feet apart for a connected drift, or 4 to 5 feet to keep individual plants distinct.
Additional Information
What are some common names for this plant?
The most widely used names for this plant are:
- Summersweet
- Sweet Pepperbush
- Coastal Sweetpepper
All three refer to the same species, Clethra alnifolia.
How is 'Hummingbird' different from regular summersweet?
It is a dwarf selection. The straight species commonly reaches six to eight feet and can look sparse at the base; 'Hummingbird' stays under four feet with a much denser, more rounded habit while keeping the same flower size and fragrance. That makes it far easier to place in a foundation bed or a small garden.
Does it actually attract hummingbirds?
The name refers to the cultivar rather than a guarantee, but the flowers do draw hummingbirds along with heavy bee and butterfly traffic. As a midsummer nectar source in shade it is one of the more productive shrubs available. Other options are collected in our Native Plants of North America selection.
Will deer eat it?
Summersweet is among the more reliably deer-resistant native shrubs and is typically passed over even in areas with real browse pressure. More options along the same lines are in our deer-resistant shrubs and evergreens collection.
Why is my plant still bare in spring?
Clethra breaks dormancy late — often several weeks after surrounding shrubs have leafed out. A plant that looks dead in April is usually just on its own schedule. Scratch a stem lightly; green underneath means it is fine.
