How to protect plants in cold weather

How to protect plants in cold weather

Extreme wet, windy and cold weather can damage plants beyond repair. Many plants are good at coping with poor weather and while they may look tired for a time, as they defrost they will spring back to life. Other plants however need more care during severe weather and this guide is here to tell you not only what plants need protecting, but how to protect them.

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What does cold damage look like?

Cold damage can manifest in a number of different ways including wilted and limp foliage, scorched or brown leaf edges, mottled brown or yellow foliage and brown crumpled foliage. This usually occurs with tender plants, but can even happen with hardy plants during long periods of severe cold when the soil becomes frozen.

Once you spot cold damage the only action you can take is to remove the affected leaves or flowers before the damage spreads and becomes more severe. If the cold damage spreads the plant will not survive, therefore preventing cold from affecting the plant is far better than trying to cure it.

How can I protect my plants from cold weather?

Fleecing

Horticultural fleece works by trapping warm air around the plants whilst stopping frost from getting in. To protect your plants using fleece simply roll it out across or around the plants you want to protect and secure with stakes or staples. Ensure that you do not leave gaps in the fleece where the cold air can get in.

Cloches

Cloches work like mini greenhouses, keeping your plant and the soil around it warm and protecting it from poor weather. Low growing plants can be protected with a cloche, however you should remove it once the harsh weather has passed as leaving it on too long can encourage disease.

Mulching

Putting mulch (organic matter) around the roots of plants will insulate and protect them from frost - however this method tends to only work effectively with hardy plants. Materials most suited to mulching include garden compost, straw and bark chippings.

Positioning

Planting in a sunny yet sheltered position, such as near a south facing wall, will provide plants with some protection from harsh weather. Grouping containers together can also help protect them from the cold and wind as they insulate each other by proximity.

Should I water my plants when it’s cold?

One of the main issues for plants during cold weather is not frost, but drought damage. Plants still continue to lose moisture through their leaves but are unable to draw up water from their roots, due to the soil being frozen. It is important to keep watering plants during winter, however it is best to do it during the middle of the day when temperatures are slightly higher. Water directly onto the soil rather than on foliage or flowers so that any moisture left on the plant doesn’t freeze and cause damage.

Whilst the benefit of snow is that it acts as an insulator, protecting plants from the cold and frost, a heavy layer of snow can cause leaves and branches to break. A light layer of snow can be left on hardy plants, however gently remove it if it looks like it’s going to cause physical damage.

Plants that will be affected by harsh weather & must be protected Plants that may suffer damage if not protected Plants that should survive if not protected
Bedding plants Heathers & alpines Hellebores
Cordyline red stars Climbers & wall shrubs Winter flowering shrubs
Planted containers Roses Deciduous plants
Spring bulbs Rhododendrons Evergreen shrubs
Herbaceous Evergreen Azaleas Conifers
Small shrubs Phormiums
Tree ferns Cordylines & grasses
Herbs Fruit trees & bushes
Vegetables Bamboos
Choisya, Cystus, Fatsia & Euonymus
Palms
Topiary (Buxus/Tasux & Bay trees)

Top tips

  • Ensure that any garden structures such as sheds or fences are secure enough to withstand bad weather by replacing or reattaching areas of weakness.
  • If the weather turns frosty do not bring plants straight into your house, as the sudden change in temperature can cause them to die.

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