Winter gardening in the warm! If you are lucky to have a greenhouse and one that you can heat, then you can enjoy gardening right through the winter months. If you don't have a heater then you can buy horticultural bubble wrap. Remember you still need good ventilation to prevent fungal diseases open vents on sunnier days and close at night. You can grow a variety of salad crops and keep eating healthily all through the winter months as well as bring tender plants in to overwinter.