In the winter, keep the greenhouse clean by removing any debris. Make sure pots and seed trays are ready for spring use by soaking them in diluted garden disinfectant, rinsing them thoroughly with clean water.

Reduce the frequency of watering and avoid a damp atmosphere by using ventilation or a de-humidifier. Plants in unheated greenhouses should be kept almost dry to their prevent roots from freezing; insulate by plunging pots into sand or by using plastic sheeting or similar material.

Keep an eye out for aphids and nip off dead or yellowed foliage.

Prepare potting compost for seed trays so that cuttings and seeds may be planted when required. Bedding plants may be sown in late winter.