Cold Weather Care for Charleston Gardens

What to Do Before & After a FreezE

While winters in Charleston are typically mild, sudden cold snaps and hard freezes can still take a toll on our landscapes. Knowing how to prepare your garden before freezing temperatures arrive - and how to respond once the cold has passed - ​can help prevent long-term damage and encourage healthy recovery. With a few proactive steps and the right aftercare, most Charleston gardens can weather a freeze and rebound beautifully come spring.

​Below are our best tips for protecting your plants and helping them recover when cold weather strikes.

Preventing Cold Damage in Charleston Landscapes

The first - and most effective - ​line of defense against freeze damage is plant selection. Choosing trees, shrubs, and perennials well-suited to the Charleston area (USDA Zones 8b–9a) gives your landscape a strong foundation. The vast majority of plants we grow and stock at Brownswood are selected specifically for our coastal climate.

That said, even hardy plants can benefit from extra protection when temperatures are expected to reach freezing for several hours or more, particularly during sudden cold snaps.

Steps to Take Before a Freeze

Mulch to Protect Roots
Apply 2–3 inches of mulch around the base of plants to help insulate roots and regulate soil temperature. Mulch is especially important for newly planted trees, shrubs, and perennials that haven’t yet established deep root systems.

Water Ahead of the Cold
If rainfall has been limited, water plants thoroughly 24 hours before a freeze. Focus on watering the root zone, not the foliage. Moist soil retains heat better than dry soil, offering extra protection overnight.

Cover Plants Properly
Use frost cloth, burlap, or even an old bed sheet to cover plants when freezing temperatures are forecast. Covers should:
​

• Extend all the way to the ground
• Be secured to trap warmer air
• Be removed once temperatures rise above freezing

Avoid using plastic directly on plants, as it can trap moisture and worsen damage.

What About Tropical and Tender Plants?

Charleston gardeners love tropical flair, but plants like tropical hibiscus, cordylines, and other tender varieties are especially vulnerable to cold. These plants are often treated as seasonal additions with the expectation that they may not survive winter outdoors.
However, some protection is possible:
​

• Move container plants into garages, porches, or other sheltered spaces during freezes.
• If containers are too large to move, water them well and cover them carefully.
• Keep in mind that containerized plants are more susceptible to cold damage and may not survive prolonged freezing temperatures - ​even when covered.

Freeze Forecast Checklist

What to do when cold weather is in the forecast:

When temperatures are predicted to dip to freezing or below for several hours, take these steps to protect your landscape:

• Check the forecast early, paying attention to overnight lows and freeze duration
• Water the root zone if rainfall has been scarce
• Refresh mulch around trees, shrubs, and perennials
• Cover vulnerable or newly planted material with frost cloth or sheets
• Move container plants into protected areas whenever possible
• Disconnect hoses and protect irrigation components

Keeping this checklist handy allows you to act quickly and confidently when cold weather arrives.

Plant Care After a Freeze

Once temperatures rise, patience is essential. Allow ice and frost to melt naturally - ​frozen plant tissue is brittle and can be easily damaged if handled too soon.

Cold injury doesn’t always appear immediately. In fact, symptoms may take several days or even weeks to show.

Common Signs of Freeze Damage

• Wilted, blackened, or brown leaves
• Mushy or collapsed foliage
• Dropped or browned flower buds
• Cracks or splits in bark on shrubs and trees

What to Do After the Cold Passes

Clean Up Soft Perennials
For hardy perennials, remove mushy or collapsed foliage once temperatures stabilize to prevent rot and disease.

Hold Off on Pruning Woody Plants
Resist the urge to immediately prune damaged shrubs and trees. Dead or injured wood often protects living tissue underneath. Wait until warmer weather returns and new growth begins to clearly show what is alive.

Prune Later - Not Sooner
Once spring arrives and the risk of additional freezes has passed, prune away dead branches. Pruning too early can stimulate new growth that may be damaged by another cold snap.

When in Doubt, Ask a Professional

Cold snaps can be stressful for both gardeners and landscapes, but with the right preparation and a little patience afterward, most Charleston gardens recover beautifully. Every yard responds differently depending on plant type, age, and exposure, so personalized guidance can make a big difference.

Questions about freeze damage or cold-weather care?
The Nursery Professionals at our Garden Center are here to help. Email us at [email protected], and please include photos if possible so we can provide the most accurate advice for your landscape.