What to grow in a greenhouse in May

May is a pivotal month for greenhouse gardeners in the UK, offering the perfect conditions to cultivate a diverse array of fruits, vegetables, and plants. As the risk of frost diminishes and daylight hours extend, your greenhouse becomes a hub of activity, nurturing tender seedlings and accelerating the growth of warm-season crops. In this comprehensive guide, we’ll explore the optimal varieties to grow in your greenhouse during May, share intriguing facts about glass greenhouses, and conclude with a delightful recipe featuring your homegrown produce.

Vegetables to Sow and Grow in May

1. Tomatoes: A greenhouse favorite, tomatoes thrive in the controlled environment it provides. Sow seeds in pots or modules, and once seedlings are robust, transplant them into grow bags or directly into the greenhouse border. Ensure they receive ample sunlight and consistent watering. Varieties like ‘Gardener’s Delight’ or ‘Moneymaker’ are well-suited for greenhouse cultivation.

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   Cucumbers: Greenhouse cucumbers prefer the warmth and humidity that a glasshouse offers. Sow seeds in individual pots and transplant them once they’re established. Provide support for climbing varieties, and maintain high humidity levels by regularly damping down the greenhouse floor. Varieties such as ‘Telegraph Improved’ are ideal choices.
3. Peppers and Chillies: These heat-loving plants benefit immensely from greenhouse cultivation. Sow seeds in early May, and once seedlings develop true leaves, transplant them into larger pots or directly into the greenhouse soil. Maintain temperatures above 15°C (59°F) to encourage fruiting. Varieties like ‘Bell Boy’ (sweet pepper) and ‘Apache’ (chilli) are recommended.
4. Aubergines (Eggplants): Aubergines flourish in the warm, stable conditions of a greenhouse. Sow seeds in pots and transplant them once they’re sturdy enough. Ensure they have plenty of light and maintain consistent moisture levels in the soil. The variety ‘Black Beauty’ is a popular choice among greenhouse growers.
5. Basil: This aromatic herb thrives in the warmth of a greenhouse. Sow seeds in pots or directly into the greenhouse border. Basil not only complements tomatoes in culinary dishes but also acts as a natural pest deterrent when planted nearby. Varieties like ‘Genovese’ or ‘Sweet Basil’ are excellent options.
6. Lettuce and Salad Greens: A continuous supply of fresh lettuce and leafy greens like rocket and spinach can be cultivated in the greenhouse. Sow seeds in succession to ensure a steady harvest.
7. Carrots: Baby or early varieties of carrots grow well in containers or raised beds within the greenhouse. Ensure the soil is light and well-drained for optimal root development.

Fruits to Cultivate in May

1. Melons: With the increasing temperatures in May, melons can be sown in the greenhouse. Sow seeds in individual pots, and once seedlings are established, transplant them into larger containers or directly into the greenhouse soil. Provide support for climbing varieties and ensure good ventilation to prevent fungal diseases. Varieties such as ‘Cantaloupe’ or ‘Honeydew’ are suitable for greenhouse cultivation.
2. Strawberries: While traditionally grown outdoors, strawberries can benefit from greenhouse cultivation, leading to an earlier and extended harvest. Plant young strawberry plants in hanging baskets or pots to save space. Ensure they receive plenty of sunlight and maintain consistent moisture levels. Varieties like ‘Cambridge Favourite’ are well-suited for greenhouse growing.

   

3. Grapes: Greenhouse cultivation allows for a longer growing season and protects grapevines from adverse weather conditions. Choose a variety suited for greenhouse growing, such as ‘Muscat of Alexandria.’
4. Figs: These Mediterranean fruits thrive in the warm, controlled environment of a greenhouse. Choose a dwarf variety and plant it in a large pot to manage growth.
5. Citrus Fruits: Lemons, limes, and oranges can be grown successfully in a greenhouse, particularly in pots that allow for easy movement to optimize light exposure.

Flowers and Ornamental Plants

1. Geraniums (Pelargoniums): These vibrant flowers thrive in the controlled environment of a greenhouse. Sow seeds or plant cuttings in pots, and ensure they receive ample sunlight. Geraniums add a splash of color to your greenhouse and can be transplanted outdoors once the weather warms.
2. Petunias: Ideal for adding color, petunias can be sown in trays and transplanted into pots or hanging baskets. They thrive in the warm conditions of a greenhouse and can be moved outside when the risk of frost has passed.
3. Marigolds: These bright and cheerful flowers not only add beauty but also deter pests when planted near vegetables.
4. Orchids: Greenhouses provide the perfect humid environment for growing exotic orchids, which require stable conditions and indirect sunlight.

Interesting Facts About Glass Greenhouses

• Superior Light Transmission: Glass greenhouses offer nearly 100% light transmission, providing plants with the maximum sunlight exposure essential for photosynthesis and growth.
• Enhanced Durability: Glass is a durable material that can withstand various weather conditions, ensuring the greenhouse remains functional and aesthetically pleasing for many years. This longevity can also increase the overall value of your property.
• Better Temperature Regulation: Unlike plastic alternatives, glass greenhouses retain heat more effectively, helping to create a stable environment for plant growth even when outdoor temperatures fluctuate.
• Pest and Disease Control: The enclosed environment of a glass greenhouse makes it easier to manage pests and plant diseases by using natural methods such as companion planting, insect netting, and organic sprays.

Recipe: Fresh Tomato and Basil Bruschetta

Ingredients:

• 4 ripe tomatoes, diced
• A handful of fresh basil leaves, chopped
• 2 cloves of garlic, minced
• 1 tablespoon of extra virgin olive oil
• Salt and freshly ground black pepper to taste
• 1 baguette, sliced

Instructions:

1. In a bowl, combine the diced tomatoes, chopped basil, minced garlic, and olive oil. Season with salt and pepper to taste.
2. Lightly toast the baguette slices until golden brown.
3. Spoon the tomato and basil mixture onto each toasted slice.
4. Serve immediately as a delightful appetizer or snack.

This simple yet flavorful dish showcases the fresh produce from your greenhouse, celebrating the harmonious pairing of tomatoes and basil.

By focusing on these crops and utilizing the unique advantages of your glass greenhouse, you can enjoy a bountiful harvest throughout the growing season. Whether cultivating vegetables, fruits, or flowers, May is the perfect month to make the most of your greenhouse space.