Yes, Clethra lose their leaves every fall. The clethra deciduous shrub drops all its foliage before winter and grows fresh leaves again each spring. This is normal and healthy behavior. You do not need to worry when you see it happen on your own plant.
The leaves on my Ruby Spice in the back corner of a Connecticut yard went yellow one October. I watched them fall within two weeks. The bare branches sat there all winter and looked rough enough that I figured I had lost the plant. Come spring it pushed out new green leaves and bloomed that summer like nothing had happened. You will likely see the same cycle on yours.
Clethra, also called summersweet, is a broadleaf deciduous shrub. That means your plant sheds its leaves once a year as the cold sets in. Hollies and boxwoods stay green all winter, but your summersweet will not. It follows the same drop-and-regrow pattern as a maple or an oak tree. You can count on it like clockwork.
Before the leaves fall, you get the best clethra fall color of the year. The green foliage shifts to a warm golden yellow. Then it deepens to a golden brown as the season winds down. That glow is one of the quiet payoffs of growing this shrub. You will see it show up most autumns without any work on your part.
Why does this color change happen at all? As days get shorter, your plant stops making the green pigment that powers its summer growth. The yellow tones underneath get a chance to show through. Soon after, the shrub forms a thin layer at the base of each leaf stem, and the leaves let go and fall. The whole process takes a couple of weeks in most yards.
Once the leaves drop, your plant stands bare through winter. But it does not go fully blank on you. The spent summer flowers leave behind small dark seed capsules. These cling to the branch tips for months. They give the shrub real structure when most of your garden has gone flat and brown. You can leave them in place all season.
Here is the part that trips people up in spring. Clethra leafs out later than most shrubs. It often wakes up weeks after everything around it has greened up. A bare summersweet in April or early May is normal. Your plant is not dead and it is not suffering dieback. Give it time and the buds will break on their own schedule.
Wait until late spring before you write off a bare clethra. New growth can appear weeks after your other shrubs leaf out, so check for green buds along the stems before you prune anything back.
Many gardeners reach for the pruning saw too early and cut into healthy wood. Do not make that mistake with your shrub. Scratch a low branch with your thumbnail first. If the layer just under the bark shows green, your plant is alive and simply running on its own slow clock.
All of this adds up to three solid seasons of interest from one plant. You get fragrant flowers in summer. Bees and butterflies will swarm them on warm days. You get golden foliage in fall. And you get summersweet winter interest from those seed capsules and the bare branching pattern. Few shrubs in your yard will work this hard across the calendar.
So do not mistake the fall leaf drop for poor health. Yellowing and dropping leaves in autumn is exactly what a clethra should do. Enjoy the color while it lasts. Let the bare branches and capsules carry your garden through winter. Then trust that fresh leaves will return on your shrub once the weather warms.
Read the full article: Clethra Alnifolia: Grow Fragrant Summersweet
