Greenhouse & Polytunnel
Growing Under Glass
A greenhouse or polytunnel extends your season by 6–8 weeks in both directions and opens up crops that simply do not perform reliably outdoors in the UK — tomatoes, cucumbers, chillies, peppers and more.
16 crops
Grower's Notes
Expert Tips
Ventilate daily from May onwards
high temperatures and poor airflow are the main causes of disease under glass. Open vents and doors on warm mornings.
Water at the base of plants, not over the foliage.
Wet leaves in the enclosed environment of a greenhouse encourage botrytis and mildew.
Introduce biological controls (Phytoseiulus for spider mite, Encarsia for whitefly) at the first sign of pests — before populations build up.
Staging (benching) lets you use vertical space efficiently.
Grow salads and herbs at bench level below your tall tomato and cucumber plants.
In an unheated greenhouse, tomatoes can be sown and planted out 4–6 weeks earlier than outdoor plants. This alone makes a significant difference to total yield.
















