How to Protect Plants from Frost

Why Frost Damages Plants

Frost occurs when temperatures fall to freezing point and the moisture within plant cells turns to ice. As this ice expands, it ruptures the cell walls, leading to damage to or the death of the plants. Young shoots and plants that are not suited to cold weather are most at risk, but keep in mind that even hardy species can suffer if frost arrives suddenly. Preventing frost damage on plants is much easier than trying to revive them afterwards, so a proactive approach and planning ahead is always best.

How to Protect Plants from Frost

There are several strategies you can use to shield your plants from cold snaps. It is much easier to learn how to protect your green wall planting and garden ahead of time than to learn how to help frost damaged plants when it’s too late to possibly revive the plants.

Choose Suitable Plants and Locations

The first step in protecting plants and green living walls from frost is selecting varieties that suit your local climate. Native and hardy plants cope far better with low temperatures and are suitable for a living wall system in a colder climate or country. For more delicate species, make sure you position them in sheltered spots, such as near walls, fences, or hedges. Here the warm air will become trapped and offer extra protection for your plants or green wall planting.

If you’re looking after green living walls, consider frost-hardy plant varieties for the upper levels, which are usually more exposed. The structure of a living wall often provides some natural insulation, but careful plant selection is still important.

Water Carefully Before Frost

While it may seem counterintuitive, watering the soil before frost can help and is an important part of learning how to prevent frost damage on plants. Moist soil retains heat better than dry soil, warming the air around your plants overnight. Avoid watering foliage directly, as wet leaves are more vulnerable to frost. Instead, focus on watering early in the day so excess moisture evaporates before evening and the frost descends.

Cover Plants During Cold Nights

Protective coverings create an extra barrier layer between plants and frost. Fleece, blankets, old bed sheets, and cardboard boxes all work well to offer additional protection for your plants during cold nights. Drape coverings loosely so they don’t compress the plants and foliage, and ensure they reach the ground to trap warm air. Remember to remove coverings during the day to allow light and air circulation. Container plants are more susceptible to frost because their roots are above ground. Move pots into a greenhouse, garage, or porch when frost is forecast.

Use Mulch for Insulation

Mulch is one of the most effective ways to prevent frost damage on plants. Applying a thick layer of organic mulch, such as bark, compost, or straw, helps regulate soil temperature and protects the roots from freezing. This is especially useful for perennials and young shrubs, where root zones may be more exposed.

How to Help Frost-Damaged Plants

Even with the best preparation, frost damage sometimes occurs. While it can be tempting to cut away blackened or wilted foliage immediately, this pruning can cause further stress. Damaged leaves can actually protect healthy tissue from further frost. Instead, wait until spring, when new growth appears, before removing dead material. After a frost, water your plants well and avoid fertilising them until growth resumes.

Frost-damaged leaves don’t always mean a plant has died. The key to knowing how healthy they are is whether the roots survived. Gently scrape a small section of bark from a stem. If the tissue underneath is green, the plant is still alive and can recover with good care.

Knowing how to protect plants from frost and how to prevent frost damage on plants can make winter gardening far less stressful. With good preparation, proper coverings, and regular plant care, you can keep your garden thriving throughout the colder months. No matter what type of garden or living wall you look after, by following the tips we’ve shared above, you can survive the winter and have a thriving garden for next spring. Contact us today for more information about the services we offer or to discuss any questions you have about looking after living walls in winter.