Winter Plant Protection in South Louisiana: What Really Needs Covering (and What Doesn’t)

Winter in South Louisiana looks very different than winter in most of the country—but that doesn’t mean your plants are immune to cold damage. In New Iberia and throughout USDA Zone 9, freezes tend to be short-lived and sporadic, which makes planning ahead the key to protecting your landscape without overdoing it.

Make a Plan Before the Cold Arrives

The biggest mistake gardeners make is waiting until temperatures are already dropping. Cold protection works best when you know which plants are truly cold sensitive and prepare supplies ahead of time. Focus your efforts on plants that are tropical, sentimental, or expensive to replace.

Not every plant needs protection, and covering everything can actually cause more harm than good.

Know Which Plants Are Cold Sensitive

In South Louisiana, common plants that often need protection during a freeze include crotons, bougainvillea, hibiscus, mandevilla, dipladenia, citrus, tomatoes, peppers, eggplant, impatiens, begonias, and petunias. These plants can suffer damage when temperatures dip below freezing, even briefly.

On the other hand, many landscape staples are cold hardy and do not need protection. Azaleas, camellias, sasanquas, hollies, blueberries, pansies, snapdragons, cabbage, peaches, pears, and plums typically handle winter temperatures just fine.

How to Use Freeze Cloth Correctly

Freeze cloth is one of the most effective tools for protecting plants during a cold snap. It should be placed before temperatures drop and left on until the freeze has passed. Always secure the cloth so wind cannot lift it, and make sure it reaches all the way to the ground to trap warmth.

If you use plastic or Visqueen, it must be removed during the day. Plastic traps heat quickly in sunlight and can damage plants if left on too long.

Don’t Forget Container Plants

Plants in pots are more vulnerable because containers can freeze solid. Water container plants well the day before a freeze, as moist soil holds heat better than dry soil. When possible, move pots closer to your home or into a protected area.

Frequently Asked Questions

What temperature is too cold for my plants?
It depends on the plant, how long the cold lasts, and overnight low temperatures. Tropical plants are often damaged below 32°F.

Should I cover plants every time it gets cold?
No. Only protect cold-sensitive plants when a freeze is expected.

Can I leave freeze cloth on for multiple days?
Yes, as long as temperatures remain cold and the cloth is breathable.

Does watering really help before a freeze?
Yes. Well-watered soil retains heat better and can reduce root damage.

Visit Hebert’s Garden Center

Not sure what needs protection in your yard? Stop by Hebert’s Garden Center & Landscaping in New Iberia. Our team can help you identify cold-sensitive plants and choose the right freeze cloth and winter protection supplies—so you’re ready before the next cold front arrives.