Some years we get little or no frost in the garden, but this year we have already had a few and there are more to come in the next few days – and no doubt more uncertain weather for the next few months. This is great news for the general health of the garden, but less so for some of the more tender plants. Four years ago we had frost and snow that hung around for some time and the agapanthus in large pots have only just recovered from being frozen – and then covered in snow for several days. This caused the crowns to rot and although I rescued them that spring by cutting away the rotted areas, they have barely flowered in the intervening three years, so I decided that some preventative measures were required.