One summer day working at a client’s garden doing routine maintenance, I caught a whiff of wonderful fragrance on the breeze. After searching for the source, I came upon a mid-sized shrub full of narrow, spike-like creamy white flowers with an extremely sweet fragrance. Alive with insects darting in and out, the shrub swayed in a slight breeze wafting fragrance. That was my first experience seeing a Summersweet, Clethra alnifolia, at its peak of bloom and fragrance, and it left a lasting impression with me. Clethra is one of the best shrubs for mid to late summer color and fragrance.
Clethra has lots of other reasons to grow besides the knock-out fragrance and the beautiful abundant flowers. The yellow fall color is a standout and the shrubs shine with a clear yellow light, even on a cloudy day.
Glossy dark green leaves with exfoliating brown bark makes this a complete multi-seasonal interest package. The fragrant flowers are followed by brown capsules, which attract small mammals and birds. A tall (6-10′), many branched, deciduous shrub, clethra often spreads into mounded clumps, spreading by suckers that pop up nearby.
There are dwarf forms, notably Sugartina from Proven Winners and these look good planted in a group.
Easily grown in average, medium to wet soils in full sun to part shade, Clethra is a valuable plant for wet situations where many other shrubs would die. it tolerates clay soils and full shade as well. Sending out suckers or runners, you can easily remove these unless you want it to naturalize and spread in a large area.
Prune if needed in late winter to shape the shrub, but many times, I leave it alone. Since the shrub blooms on new growth, pruning can be done without any harm to the future flowering. Sometimes after a harsh winter, pruning is a good way to rejuvenate the shrub, removing any old or weakened branches. Clethra tolerates occasional flooding, actually thriving in wet soil, which makes this a perfect rain garden plant.
Native from Maine to Florida and west to Texas, it is found in the wild in mashes, stream banks, and along seashores. Flowering in mid to late summer, when most shrubs are done, the flowers are like magnets for butterflies, hummingbirds, and bumblebees, honey bees, and other native bees – a huge draw! Even in shade, Clethra will flower profusely, so it is a great native for woodland gardens. I like to group the shrubs in borders for dramatic impact.
After I designed a healing labyrinth for a client, I surrounded it with Clethras which light up the entire area in the fall with their yellow color. Rarely bothered by deer and not troubled with disease or insects, this is an extremely versatile native shrub. Noted plantsman Michael Dirr says of this plant, “This is one of my favorite shrubs and the more I work with it, the greater my appreciation for its user-friendly nature”.
15 Replies to “Clethra: Deer Resistant, Fragrant, and Pollinator Catnip”
I love my clethra. I give the runners to friends who also love them.
Yes, it is a ‘giver’ of new plants!
This is the “go to” shrub for pollinators. My honey bees love it. Beach Plums are a favorite too!
I will look that one up!
Thank you. I have just the place for this plant. In fact, I just ordered some seeds.
Wow, you must have some patience! Let me know how it works
Thank you for this post. This plant has been reliable & trouble free n my garden for 6 yrs. It’s planted in partial shade beside the pond along with Karl Foerster grass & Calacarpa . I don’t know of anyone else in this area (or my garden club) that has it.
Nice to know! Thanks
How does it do in northern climes? I live in zone 5 in Canada but have the bees and the water. My rhododendrons come up year after year but before I start my hunt….
It should do fine
Ruby Spice Summersweet is NOT deer resistant! I am at war with the deer devouring my 3 bushes. They are so insistent on eating those Summersweet bushes, they actually pushed over the cages I put over them and now they’re chewed down to the point I’m afraid they’ll not flower this next summer.
Deer Resistant is only a general term. For most people, they leave it alone, but for others, not. It just means it isn’t their favored food.
I’m having the same problem. The deer LOVE my Ruby Spice bush.
The deer love my Clethera ‘Hummingbird’ in zone 7