July Blooms in my Georgia Garden: Clethra, Summersweet, Sweet Pepper Bush

Clethra alnifolia 'Ruby Spice'

Blooming in the heat of summer with temperatures hovering near 100 degrees is Clethra alnifolia. Also known as Sweet Pepper Bush or Summersweet, Clethra attracts many pollinators with its honeyscented blooms of pink or white. Clethra is a deciduous blooming shrub native to the Eastern United States. I'm a little late with this post, since our Clethras all bloomed earlier in July and have now finished blooming.

Because I love all things pink, my favorite Clethra is Ruby Spice. Vivid pink bloom spikes adorn the tips of almost every stem in late July or August. Ruby Spice Clethra is a tall shrub, reaching up to 8 feet tall at maturity.

Clethra 'Hummingbird'

If you prefer white blooms, Clethra Hummingbird is a popular choice a lake at Callaway Gardens. 

Hummingbird Clethra encircles the edge of Hummingbird Lake behind the Discovery Center. This shrub has pure white bottlebrush blooms spikes about 3 inches long. The fragrant blooms which smell kind of spicy attract pollinators from a great distance.

Another white bloomer is Clethra Sixteen Candles, selected and named by horticulturist Michael Dirr from the University of Georgia. This Clethra is so named because when in bloom its upright flowers resemble candles on a birthday cake. These blooms are up to 6 inches long! Due to its compact habit, this one grows well in containers so it would be great on a patio or sunny porch where the blooms and their fragrance could be better enjoyed.

Clethra 'Sixteen Candles'

No matter the flower color, butterflies and bumble bees love the nectar produced by Clethra blooms. I'm watching to see if our honeybees visit the blooms too.

Clethra needs regular water to grow well. In its natural environment it is found growing on the banks of a creek or lake. Full sun makes the plant bloom prolificly in the latter part of summer. You'll want to be able to reach the plants with a hose when summer drought arrives. 

Clethra can be grown literally all over the United States, since it is hardy in USDA Zones 4 - 9.

Clethra: Sweet Pepper Bush

Clethra is one of my favorite native plants, but more importantly, it's a favorite plant of butterflies and other pollinators! Clethra alnifolia, better known as Summersweet or Sweet Pepper Bush, is wonderful native plant that blooms in late summer. Obviously the common name 'Summersweet' comes from the very sweet-smelling blooms that appear right in the heat of the summer. The other common name 'Sweet Pepper Bush' comes from the attractive seed capsules that closely resemble Peppercorns.

The fragrant blooms which are 6-inch long spikes last for more than a month and attract many pollinators.

There's a Clethra for every garden, since this shrub is available in both large-growing and dwarf varieties. But when I say 'available' I realize that Clethra is truly difficult to find in nurseries. Why, I do not know.

My favorite is 'Ruby Spice' since I'm a fan of pink flowers, but the white-blooming 'Hummingbird' is much sought after, probably due to the beauty of the shrubs planted en mass around Hummingbird Lake at the famous Callaway Gardens in Pine Mountain, Georgia.

If your garden requires a dwarf shrub, seek out 'Sixteen Candles'--a more compact plant that seems to have more bloom spikes than possible! The name was given to this plant by Michael Dirr because the upright bloom spikes really do resemble candles on a birthday cake. This plant is truly spectacular!

Whichever you find, you can count yourself lucky to have this plant in your garden. It requires only consistent moisture to keep it happy. (I'm sorry, I do know that consistent moisture is hard to provide in Georgia these days, but if you have a wet spot, a pond edge, a soaker hose, or even, as in our case, stopped up field lines because your wife didn't know any better than to plant a Weeping Willow in the wrong spot, this shrub is definitely worth the trouble!)

Of course, my favorite online source for native plants is Shady Gardens Nursery.

Clethra Attracts Hummingbirds and Butterflies to the Garden in Summer

If you're lucky enough to have a moist spot in your garden, consider Clethra alnifolia. Clethra is also known as Summer Sweet or Sweet Pepper Bush.

Blooming in the middle of the hot summer is enough reason to name it Summer Sweet, but I think that common name derives from either the sweet fragrance or the sweetness of the nectar. Butterflies, hummingbirds, and other pollinators love it as much as you will, and they'll appreciate you for planting it in your garden.

Once the blooms fade, dark black seeds are visible on the tips of the stems, hence the other common name Sweet Pepper Bush.

There's a Clethra suitable for just about every garden, since a variety of types are available.

• Ruby Spice has rosey pink blooms on a large growing shrub up to 10 feet tall.
• Hummingbird has white blooms on a more compact plant around 3 feet tall. This is the one seen growing around Hummingbird Lake at Callaway Gardens.
• Sixteen Candles 6 inch long white flowers on a tidy shrub about 4 feet tall.

All Clethra varieties are very fragrant, reminding me of fresh honey.


Clethra is easy to grow, but does need regular water. Perfect around a pond or stream, but you can grow it right in your garden as long as you can water it weekly.


Clethra grows well anywhere in USDA Zones 4-9.


An added bonus is that Clethra displays lovely yellow foliage in fall! 


For Clethra plants by mail, go to Shady Gardens Nursery.

Four Oclock: Fragrant Blooms for the Evening Garden

If you like fragrant plants, the old-fashioned Four Oclock will be one of your favorites. Small pink blooms scent the garden with their sweet perfume every evening during summer. Mirabilis jalapa is a shrub-like multibranched perennial plant that emerges each spring from a large carrot-shaped tuber. The common name Four Oclock comes from its fascinating habit of opening its blooms around 4 oclock in the afternoon. That alone is enough to intrigue me, since I have a natural interest in plants with unusual traits. Although it's called Four Oclock, in our garden Mirabilis actually opens her blooms around 5:30 pm, perfuming the air right about the time it begins to cool off enough to sit in the shade on the patio.

Four Oclock is very easy to grow. Easy to please, four oclock can be grown in sun or shade. Our plants get morning sun and afternoon shade, but four oclock grows equally well in full shade with a reasonable amount of water. She's not a water hog, but good soil with regular water will keep the plant looking healthy and green with plenty of those fragrant blooms. Just so you'll know, plants in our shade garden get very little water, yet still bloom and multiply with profusion. Plants in the sun that receive occasional water perform just about as well as those in dry shade. The few Four Oclocks we have in dry sun are just surviving.

I can't really describe the fragrance--it's just a sweet, pleasant scent that invites me to relax outdoors. You might not notice the scent until your plant gets large with many blooms. And if you're never outdoors in the evening, well...you'll just miss out entirely.

Another important feature of the fragrant Four Oclock is that hummingbirds just adore it! The hot pink blooms are tubular and full of nectar for both butterflies and hummingbirds. You'll further enjoy sitting on the patio observing the tiny creatures flitting about around the plants.

Four Oclock dies to the ground with the onset of winter in colder zones, but re-emerges again in late spring. Hardy in USDA Zones 7-11, mirabilis can be grown anywhere in the southern half of the United States.

I must tell you also that Four Oclock is definitely a reseeder. Toward the end of summer you'll notice small black cannonballs on the plants and the ground beneath. Those are very viable seeds. If you've had no luck growing Four Oclock from seed, that's because these very hard seeds need a cold treatment to break them. It's best to plant them in fall, but most gardeners don't think about it then and seeds often are not available in the big box stores at that time of year. You'll have nearly instant gratification if you go ahead and purchase a tuber instead. Heavy black carrot-shaped tubers will send up a stem very quickly after planting in warm summer soil. Four Oclock tubers are available for summer shipping from Shady Gardens Nursery.