The illustrated growing guide
Summersweet
Clethra alnifolia
Family Clethraceae
Est. zones 3-9
One of the very few shrubs that blooms fragrantly in shade AND in August — a pollinator lifeline when the summer garden is spent. Wet-tolerant, deer-resistant, and the perfume carries across the yard. Underused native gold.
Full Sun to SHADE
Moderate water
Slow-Moderate growth
Deer-resistant
Native to North America
Attracts butterflies
Attracts beesI
Overview
Will summersweet suit your garden, and what goes wrong.
Will it thrive where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what summersweet actually needs.
Hardy inZones 3-9Summersweet at a glance
Common summersweet problems
- Almost none
- Almost none
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow summersweet: light, water & soil
How to plant & propagate summersweet
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The year
What summersweet asks for, month by month.
The summersweet year, month by month
BloomPruneWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
The summersweet year as text
- Jan quiet month
- Feb quiet month
- Mar pruning
- Apr pruning
- May quiet month
- Jun quiet month
- Jul bloom
- Aug bloom
- Sep quiet month
- Oct quiet month
- Nov quiet month
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
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Ecology & uses
What it does for the garden, and what it is grown for.
Summersweet in the garden system
- Shrub layer shrub
- Nectary/insectary
What summersweet is grown for
✓ Not known to be toxic
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
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Cultivars
Named varieties of summersweet, ruled as a catalogue.
Best summersweet varieties & cultivars
'Ruby Spice' (pink, holds color); 'Hummingbird' (compact); 'Sixteen Candles'
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Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to summersweetyet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
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Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
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Questions
Summersweet questions, answered straight.
Do deer eat summersweet?
Rarely — summersweet is considered deer-resistant, which makes it one of the safer unfenced choices in deer country. Hungry deer in a hard winter test every rule, but it's a low-risk pick.
Is summersweet safe for kids and pets?
Summersweet is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
How do you propagate summersweet?
Seed (stratify), cuttings, or layering.
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Elsewhere
Where summersweet sits in the library.
Rose
Hydrangea
Common Lilac
Forsythia