Why Are My Rhododendrons Curling? Winter Woes Explained!
Why are rhododendrons curling up like they just saw the heating bill? If you’ve stepped outside this winter and noticed your Rhododendron leaves curling up tighter than a New Englander without their winter coat, don’t panic! Your plants aren’t dying—they’re just dramatically embracing the Cape Cod cold like the rest of us.
What’s Going On?
This winter leaf-curling phenomenon is called thermonasty (yes, that’s a real word, and no, it’s not a forgotten ’90s ska band). When temperatures drop, Rhododendron leaves curl inward and droop, making them look like they’re questioning all their life choices.
Scientists are still figuring out exactly why this happens, but the leading theory is that it helps protect the leaves from sun damage on cold days. Essentially, the plant is trying to reduce moisture loss and prevent freezing damage—kind of like how you instinctively hunch over and wrap your arms around yourself when the wind picks up.
Is My Rhododendron OK?
Yes! This curling is completely normal and not a sign of distress. Once the temperatures rise, those leaves will stretch right back out like nothing ever happened.
However, if you notice browning, yellowing, or crispy leaves that don’t recover in warmer weather, your Rhody might have suffered some winter burn.
If you’re concerned about winter damage or need advice on how to help your Rhododendrons thrive, contact Extension’s Master Gardener Association of Cape Cod at gardeners@capecod.gov.
Winter Survival: Just Like Us
In short, Rhododendrons are built for this—they’ve been handling cold snaps long before we started layering up in puffer jackets and debating if we need another Dunkin’ run. So, if your shrubs are looking a little sad, don’t worry! They’re just waiting for spring like the rest of us.
Got more winter gardening questions? Cape Cod Cooperative Extension’s Horticulture Clinic is here to help! Reach out, and we’ll make sure your plants (and your nerves) survive the season.
