Thompson & Morgan Gardening Blog

With the onset of the cold weather it is important to consider protecting your plants from the frost which will no doubt be on the way. Inadequate frost protection has killed too many plants, so don’t get caught out this winter, as we know the weather can change in a matter of days.

As the temperature starts to drop the cells in plants can freeze, this blocks vital fluid movement so plants no longer receive nutrients. Ice forming in cell walls will eventually dry and the plant will no doubt die. Ice can also cause sections of the plant to die back. When weather warms the thawing process damages plants. Damage is easy to see. The foliage is usually affected first, becoming discoloured, and wilting. The stem will eventually blacken and the plant turns brown and crispy.

Choosing plants wisely to begin with will always be the best method of prevention. If you live in an area that suffers from heavy frosts, extreme weather or gets water logged then buy plants that can withstand this type of environment if possible. However, if you are taken by surprise with adverse weather conditions at Thompson & Morgan we have products to aid plant protection.

Bell boy cloche & pastic tunnel cloche

Move your containers and pots with specimen plants, such as palms, to a sheltered spot in the garden. Another protection tip is to move them off the ground. Put small pieces of wood or legs underneath the pots. This will stop the roots getting cold, and the plant from becoming waterlogged. A bell boy cloche can be added on top of smaller plants.

With heavy brassicas, such as Cabbage ‘Savoy King,’ brussels sprouts, draw up soil around the base of the stem to prevent movement. If the wind does manage to rock them this can cause damage and prevent them from providing a healthy crop in the spring. Once you have drawn the soil up then add netting over them to protect them from the pigeons.

On cold nights apply horticultural fleece to hardy salad crops such as Lettuce ‘Winter Gem’ and Salad Leaves ‘Land Cress’ and Corn Salad ‘Cavallo.’ This will protect them from the harshest of the cold weather, which can blacken the leaves, or even kill them completely.

Netting & Horticultural fleece

Potted plants that can stay out over the winter can be grouped together in a sheltered spot. Put horticultural fleece, and they can be stored in a cold frame if you have one. Cold frames are usually used to protect hardy young plants such as Stenocarpus sinuatus. It is a good idea to add in any plants that are susceptible to rotting in cold, wet conditions.

If you soil is heavy clay then it could be an idea to keep some of your winter vegetables such as carrots and pak choi in a cold frame or unheated greenhouse.

Cold frame & Lean-to greenhouse

Tender perennials such as Coleus ‘Kong Mixed’ or geraniums should be lifted and stored in the greenhouse and given extra protection with horticultural fleece, and in some cases, a heated greenhouse. This type of warmth will encourage good root growth through the cold months.

Straw can be used to protect plants that cannot be moved indoors. A cloche or mini tunnel will also add extra protection from freezing conditions. Fruit such as strawberries can be covered with straw and broken twigs, this stops the frost from getting at their roots.

Winter tips

Moving deciduous trees and shrubs, or fruit trees while dormant, avoids damage. This allows them to be settled in to their before they start to grow again. So if you are thinking of moving a tree or shrub from one part of the garden to another, now is the time to do it.

A well documented tip during winter is to try not to over water your plants. Just a small amount every so often has proved to be the best way to keep your plants happy during this time of year.

Good luck with your over wintering. If you have any good tips for our new gardeners, please let us know.

Wendie Alexander

I have worked for Thompson & Morgan for nearly four years. In that time I have learnt lots about gardening, but consider myself very much a novice. I have started growing veg on a colleague’s allotment and also growing windowsill seeds such as Salad Leaves and Rocket. I love gaining more knowledge about horticulture and am lucky enough to work here.