Sometimes it’s just not practical to lift or move borderline hardy plants. In that case the best thing to do is wrap them with items that will both insulate from the cold and wind, whilst allowing air to circulate.
Horticultural fleece, straw, hessian and bracken can all be used.
Keep an eye out on the weather forecast and, if very mild spells occur, remove the covers during that time. This helps prevent potential rotting of the plant stems, and replace as soon as temperatures start to dip, or cold winds whip up.
Examples of plants that need to be wrapped are tree ferns and bananas.
When wrapping tree ferns the leaf fronds should be tied in an upright position and then the centre packed out with straw or bracken before wrapping. Then tie the whole tree with a double layer of horticultural fleece. Add a deep layer of mulch all around the base to help protect the roots from frost.
Mature bananas (Musa basjoo) should have their top growth sawn off, leaving stumps. Then surround the tree with a cage made from canes with chicken wire wrapped around them and secured with cable ties. Pack out the cage with straw and then cover the cage with hessian or horticultural fleece to keep out the wind. Covering the top with polythene sheets helps protect the crown from excessive winter wet.
Unwrap plants in May.