A heating mat will ensure that your seeds have a constant steady temperature. This results in faster and even germination. Chillies, peppers, sweet peas and many more need about 15°C to germinate. If your home is cold or you have an unheated greenhouse, then it will heat just the seed trays and you won’t face a bill for heating the whole room. It also allows you to extend the sowing season. They can be used to help cuttings strike, and you can utilise the mats to overwinter tender specimens.