A Season of Transition and Growth

As we step into September, the vibrant days of summer start to mellow and cooler evenings begin to settle in. For UK gardeners, this transitional time is perfect for making the most of your  greenhouse. Whether you’re a seasoned gardener or new to the joys of growing under glass, September is an exciting month to work in your greenhouse and prepare for the season ahead.

Why September is Special

September offers a unique blend of warmth and coolness that plants thrive in. While the outdoor garden may start slowing down, your greenhouse creates a controlled environment where you can extend the growing season and experiment with a variety of crops. The gentle sunlight of early autumn is less intense, meaning plants are less likely to suffer from the scorching heat of midsummer. It’s also a great time to start planning for winter crops while still harvesting the last of your summer fruits and vegetables.

What to Grow in September

This month is ideal for both harvesting and sowing. If you’ve been growing summer crops like tomatoes, cucumbers, or peppers, you’ll likely still have plenty to pick in your greenhouse. Make sure to keep harvesting regularly to encourage continued production.

September is also the time to think ahead to cooler months. Here’s what you can plant:

1. Winter Lettuce – Quick-growing varieties like ‘Arctic King’ or ‘Winter Gem’ will thrive in cooler conditions.
2. Spinach – Spinach loves the cool weather and will provide you with nutritious greens throughout autumn and winter.
3. Radishes – A fast-growing crop that’s perfect for planting now. Radishes will be ready to harvest before the colder weather really sets in.
4. Carrots and Beets – Try planting some late-season carrots or beets. These root vegetables grow well in cooler temperatures and can be harvested well into the winter.

In addition to planting, there are some essential maintenance tasks to tackle in your greenhouse during September to ensure your plants stay healthy and productive.

• Clear Out Old Plants: Once your summer crops are finished, it’s important to clear out any old plants, including their roots, to prevent the spread of disease.
• Ventilation: Although temperatures are cooling, your greenhouse can still heat up on sunny days. Make sure to keep it well-ventilated, opening vents or doors to allow fresh air in. This helps prevent issues like mould or mildew on plants.
• Watering Routine: As the weather cools, your plants won’t need as much water, but they will still need regular attention. Be mindful not to overwater as this can lead to root rot in cooler conditions.
• Check for Pests: September is the time when pests like aphids and whiteflies can still be active. Keep a close eye on your plants and act quickly if you see any signs of infestation.

Gardening in your greenhouse in September can be incredibly rewarding. The hustle of summer slows down, giving you time to savour the process of planting, tending, and harvesting. It’s a wonderful opportunity to reflect on the growing season while preparing for what’s ahead.

Whether you’re sowing winter vegetables or simply enjoying the last of your summer bounty, your greenhouse offers a space of peace and productivity all year round. Embrace this time of transition, and look forward to the fruits of your labour well into the winter months.

Happy gardening!