May is a brilliant month for greenhouse gardening. As the days get longer and temperatures rise, conditions become ideal for growing a wide variety of vegetables under cover. Whether you’re working in a small garden or managing a larger growing space, greenhouses allow you to start plants earlier, protect them from pests, and extend your growing season.
To get the best results, it helps to plan ahead and keep your greenhouse organised. With a thoughtful greenhouse staging setup, you’ll be able to make the most of available space and light — crucial elements for strong, healthy crops.
1. Tomatoes
Tomatoes are a classic greenhouse favourite. May is the perfect time to pot on young plants or sow fast-maturing varieties directly in grow bags or deep pots. Ensure good airflow and regular watering, and support plants with canes or string as they grow. Consider positioning them near doors or vents for added ventilation on warm days.
2. Peppers and Chillies
Both sweet peppers and chillies thrive in warm, sheltered conditions. Start them in smaller pots and transplant to larger containers as they grow. A sunny shelf or top tier of your staging is ideal, especially when combined with good greenhouse ventilation to prevent overheating.
3. Cucumbers
Choose greenhouse varieties that are bred to grow well in controlled environments. Cucumbers love warmth and humidity, so regular watering and light misting on hot days can help. Train them upwards with mesh or twine to save space on staging and allow more light to reach lower crops.
4. Lettuce and Salad Greens
If you’re looking for quick, repeatable harvests, try growing mixed salad leaves, rocket, or butterhead lettuce. These crops do well in shallow trays and can be harvested multiple times. Even better, they fit easily beneath staging benches — a clever way to grow more without sacrificing surface space.
5. Courgettes
May is the right time to sow courgette seeds in large pots. While these plants can get quite big, they’re productive and rewarding. Use our seasonal planting tips to help you plan when and where to move them outdoors once the risk of frost has passed.
Tips for Success
- Use staging or shelving to separate crops by size or light needs
- Water early in the day to reduce humidity overnight
- Open vents and doors daily to prevent overheating
- Feed flowering crops like tomatoes and cucumbers with a balanced liquid fertiliser once fruits start forming
Greenhouse growing in May is all about smart planning and making use of the warmth and light. With the right crops and a tidy layout, you’ll enjoy fresh harvests in no time.
Looking to upgrade your setup? Explore our full range of greenhouse staging and accessories to get the most from your space this season.