Even on gloomy and overcast days in the summer, the greenhouse temperature can shoot up. By autumn though, it reverses and can plummet to dangerous levels for plants in a matter of minutes.
With our rapidly changing weather patterns, driven by climate change, greenhouse owners need to start planning now to make them fit for autumn and winter, warns greenhouse expert Linda Lane, managing director of Griffin Glasshouses (griffinglasshouses.com).
“It’s all about hygiene and common sense,” says Lane. “The greenhouse will give plants a lot of protection but, with all that glass, temperatures change rapidly, so take precautions. It is also an attractive location for pests to overwinter, so regularly check for attack and treat with proprietary controls.”
As autumn approaches, she shares some top tips on what to do now and during the cooler months, to keep your greenhouse and plants in top condition…
Greenhouse jobs that won’t wait
1. Repair all broken glass, damaged door and window fittings, leaks and bad framework.
2. Remove all plant pots and seed trays and store elsewhere. They are havens for overwintering slugs, snails and other pests.
3. Check heating systems and repair as necessary. Do you have sufficient fuel? If you are not heating the greenhouse, buy rolls of horticultural fleece to protect plants in frosts.
4. Check that interior lighting works properly.
Greenhouse jobs to do before the first frosts
1. Clear out all plants and thoroughly disinfect all glass frames, staging tops and floors.
2. Clean the glass inside and out, as plants need to maximise the diminishing autumn and winter sun.
3. Protect all taps from freezing, including those inside greenhouses.
4. In cold areas or if overwintering particularly tender plants, double glaze greenhouses with bubble wrap. This can be attached to all Griffin Classic glazing systems with Alliplugs, which are widely available online.
5. Keep the inside clean and on warm or sunny days open doors and windows in the daytime.
Additional greenhouse tasks
Lane is currently busy working in her garden in preparation for the seasons ahead.
“Now is the ideal time to take cuttings such as geranium, penstemons, lavender, species of fuchsia and even more exotic shrubs such as ceanothus. They need to be kept moist and warm and, as temperatures fall, take them into the greenhouse overnight,” she says.
“But don’t leave them where potentially hot early morning sun can cause damage. It will still be safe to take them outside in the daytime until the first warning of frost and then overwinter them in the safety of the greenhouse.”
With spring in mind, now is also the time to sow some annual seeds such as cornflower and nemesias. They will grow on in a cool greenhouse and be ready to plant out to give an early burst of spring colour to the garden.
“Finally, don’t forget to move those tender plants back into the protection of the greenhouse before the frosts start, but do check pots and containers for unwanted pests such as slugs and snails,” Lane advises.
“They would love to overwinter in your greenhouse, feasting on your plants, cuttings and seedlings. So remove them, and throughout autumn and winter, check all plants regularly for pests, diseases and mildew and take the necessary remedial action.”
Best-selling greenhouse accessories
Check out our list of best-selling Amazon products!
- STYLISH DESIGN MIN MAX THERMOMETER - Digital greenhouse temperature thermometer showing high, low and current temperatures. One of those garden and greenhouse accessories you shouldn't be without.
- GREAT PURCHASED AS GIFTS FOR GARDENERS - Suitable for indoor and outdoor use, this is one of those gardening gifts they will love. Also benefits from an attached roof for extra protection from the...
- IS A MIN MAX THERMOMETER THE SAME? - Yes, just named different. An ideal tool which can be used as a greenhouse thermometer
- More for your money – 60 green high-quality clips included
- Resistant – all hangers are made of heavy-duty plastic – up to max. 30 kg load weight.
- Space – use the potential given space in your paradise
- STYLISH MAX MIN THERMOMETER - Digital display garden maximum minimum thermometer showing high, low and current temperatures. One of those greenhouse accessories you shouldn't be without.
- GREAT AS A GARDEN THERMOMETER! - Suitable for indoor and outdoor use (If using outdoors, please site in protected position. Instrument not waterproof) in the home, garden or greenhouse. East to reset...
- IS A MIN MAX THERMOMETER THE SAME? - Yes, just named different. An ideal tool to monitor high and low fluctuations in temperature which is great for gardeners and gardening experts in particular
- 【Material】 These greenhouse glazing clips are made of quality stainless steel, greenhouse bolts and nuts are made of aluminium, both materials are rustproof and sturdy to use, thus extending...
- 【Size】 W wire clip is about 7.9cm / 2.9" in length, and 1 mm / 0.04" in thickness; Z overlap clip is 1.3 cm / 0.52" in length; Aluminium bolts and nuts are M6 with an 12 mm thread, suitable for...
- 【Practical Accessories】 This greenhouse repair accessories kit can help your greenhouse go against bad weather. When typhoon or rainstorm comes, you can prepare these greenhouse glass and pane...
- Extremely stable – thanks to an optimised product design, the Homegard trellis clips offer extremely stable hold. Thanks to additional diagonals, the holders have a better load absorption especially...
- Effortless assembly – to make the attachment as easy as possible, no tools are required for installation. Insert the head of the clip into the gap of the aluminium profile and turn the holder 90...
- Secure hold – thanks to the hammer head screws and the above plate, the clips clamp in the roof as well as the vertical wall profile after screwing in. Easy to place on all profiles
Last update on 2021-09-22 / Affiliate links / Images from Amazon Product Advertising API