If you're growing in a polycarbonate greenhouse in Ireland, June is one of the most exciting and productive months of the gardening calendar. The combination of long daylight hours, rising temperatures, and the protective environment of your greenhouse makes it ideal for growing a wide range of crops – especially those that love warmth.
At Keane Gardens, we supply and install high-quality polycarbonate greenhouses across Ireland, designed to thrive in our unique climate. In this post, we’ll guide you through what to grow, how to care for your plants, and how to get the most from your greenhouse this June.
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🌱 What to Grow in Your Greenhouse in June (Ireland)
Wondering what to plant in your greenhouse in June in Ireland? Thanks to the insulated, UV-stable panels of your polycarbonate greenhouse, heat-loving vegetables and herbs will flourish.
Sow or transplant now:
Cucumbers – Perfect for greenhouse growing. Train them vertically to save space.
Peppers and chillies – Thrive in warm, stable conditions.
Aubergines – Ideal for sheltered growing in containers or grow bags.
Herbs like basil, coriander, and dill – Fast-growing in warmer environments.
Courgettes – Plant in rich compost in large pots or beds.
Continue caring for:
Tomatoes – Feed regularly, remove side shoots, and ensure good airflow.
Lettuce and salad leaves – Sow successionally every 2–3 weeks for ongoing harvests.
Strawberries – Check daily for ripe fruit to avoid rot and mould.
These crops benefit enormously from the warmth and protection that polycarbonate greenhouse panels offer – especially in Irish summers where the weather can still be unpredictable.
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🌡 Greenhouse Temperature and Ventilation in June
Polycarbonate greenhouses retain heat well, which is a big advantage in Ireland. However, in June, it's crucial to prevent overheating.
Tips to regulate greenhouse temperature:
Open vents, louvres, and doors daily to improve airflow.
Use shade cloth or netting to reduce intense midday sun.
Dampen floors and staging with water in the morning to raise humidity and cool the space.
Proper ventilation keeps your plants healthy and reduces the risk of disease in your greenhouse.
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💧 Watering and Feeding in a Greenhouse
With longer days and higher temperatures, greenhouse watering becomes a daily task in June.
Watering tips:
Water early in the morning or late in the evening.
Target the soil or root zone – avoid wetting the leaves.
Use capillary matting or drip irrigation for consistent moisture.
Feeding your plants:
Use a high-potassium feed (like tomato food) once a week for fruiting crops.
For leafy greens and herbs, use a balanced liquid fertiliser every 10–14 days.
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Maintaining cleanliness and airflow in your polycarbonate greenhouse is key to preventing pest outbreaks in June.
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🧹 Greenhouse Maintenance for Mid-Year Success
Now is a great time to inspect and tidy your greenhouse:
Clean polycarbonate panels to ensure maximum light reaches your crops.
Check door hinges, and irrigation systems for smooth operation.
Remove any plant debris or unused pots to reduce disease risk.
At Keane Gardens, we recommend a quick monthly maintenance check to keep your greenhouse performing at its best – especially during the growing peak.
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Get the Most from Your Greenhouse This Summer
Growing in a polycarbonate greenhouse in Ireland in June is all about consistency – regular watering, smart ventilation, and feeding your crops properly. With just a little daily attention, you’ll enjoy lush growth, early harvests, and fewer pest issues.
If you’re considering adding a greenhouse to your garden, or upgrading to a more durable and weatherproof option, explore our full range of polycarbonate greenhouses supplied and installed in Ireland.
Keane Gardens – Polycarbonate Greenhouses Ireland. Built to last. Delivered and installed nationwide.