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In a November 4, 2026, Amateur Gardening report, editor Kim Stoddart recommends removing plant debris from greenhouse and polytunnel coverings, while delaying exterior cleaning until most leaves have fallen. She also advises allowing brief periods of ventilation during colder weather and removing yellowing leaves to help limit fungal problems.
Amateur Gardening editor Kim Stoddart published autumn maintenance advice on November 4, 2026, recommending that greenhouse and polytunnel owners clear foliage from coverings, maintain some airflow in colder weather and prepare growing spaces for winter. The guidance matters because debris can reduce light and contribute to damage, while insufficient ventilation can encourage fungal disease, according to Stoddart.
Stoddart advises starting with the inside of the covering, where leaves from plants such as tomatoes and grapevines can cling to plastic and rot. Removing them helps keep the surface clear and allows more light through, she writes. Fallen leaves can also collect on the exterior. Because more are likely to fall over the coming weeks, she says she generally waits to clean the outside until the leaf fall has largely finished.
For cleaning, Stoddart describes using a hose spray and sponge or soft brush on interior surfaces. For hard-to-reach exterior areas, she says she has used bedsheets tied together and pulled back and forth with a helper. Her advice is to remove debris from the plastic while leaving some lower foliage or ground cover as shelter for wildlife, including spiders and ground beetles.
Her recommendations also cover containers and winter ventilation. Stoddart says she empties spent compost onto beds or borders, shakes planters and stores trays without routinely washing them, unless a particular pest or disease is a concern. As temperatures fall, she recommends keeping doors and windows closed more often to retain heat but opening them briefly several times a week where possible. She also advises removing yellowing lower leaves and continuing to harvest leafy crops to support further growth.
Protecting Light and Winter Growth
Autumn maintenance can affect how well a protected growing space functions through winter and how much work it needs later. Stoddart links clear coverings with keeping light levels higher, and says damaged plastic should be repaired promptly. Debris left against plastic may block light and, over time, erode the covering.
Ventilation presents a seasonal trade-off: growers may want to conserve heat as temperatures drop, but Stoddart says some airflow remains necessary to help avoid a buildup of fungal diseases. Her approach is brief, regular airing rather than leaving doors and windows open for long periods. The source offers practical guidance, not measured results or a guarantee that these steps will prevent disease or extend the life of a cover.
Stoddart says a polytunnel cover she owns is at least 16 years old and still working well. That is her personal example, not a general lifespan estimate. She attributes longer use to keeping the cover clean and repairing damage quickly, while noting that the recommended replacement date can sometimes be exceeded.
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A Seasonal Polytunnel Maintenance Routine
The report is a fortnightly seasonal advice piece for people growing plants under cover, rather than an announcement of new research or a change to gardening regulations. It appeared on the Amateur Gardening website on November 4, 2026, as the main growing season winds down and autumn leaves continue to fall.
Stoddart’s suggestions distinguish between tasks to do now and those to delay. Interior debris can be removed while plants remain in place; exterior cleaning can wait until most leaves have fallen. Likewise, she suggests storing reusable pots and trays after emptying them, with extra cleaning considered if growers are concerned about a specific pest or disease. The report does not specify a particular cleaning product or treatment.
“The more you look after your polytunnel or greenhouse, the more productive it will be for the longer term.”
— Kim Stoddart, Amateur Gardening editor
How Long Covers Can Last
The report does not give a standard lifespan for greenhouse or polytunnel plastic, explain how to determine when a cover should be replaced, or quantify how much cleaning and repair extend its use. Stoddart’s account of a cover lasting at least 16 years is an individual example, and performance can vary by material and conditions; the article provides no comparative data.
It also does not set a fixed ventilation schedule for different structures, crops or weather conditions. The suggested brief openings several times a week are general advice, and the report does not identify a specific disease risk at any reader’s site. Whether trays need more cleaning depends, in Stoddart’s account, on concerns about particular pests, disease or eggs.
Tasks for the Coming Weeks
Stoddart’s immediate recommendation is to clear foliage and debris from the inside of the growing space, then keep an eye on fallen leaves around the exterior. She generally postpones cleaning outside until leaf fall is mostly over, which may take several more weeks. Growers can also sort and store containers, keeping damaged trays in use by doubling them up where practical.
As colder weather continues, her advice is to conserve warmth while opening doors or windows briefly a few times during the week when conditions allow. Removing yellow lower leaves and harvesting suitable leafy growth are also part of the ongoing routine. The report does not announce a follow-up date or new programme; its next steps are these seasonal tasks, adjusted to local weather and the condition of each growing space.
Key Questions
What should be cleaned first in a greenhouse or polytunnel?
Kim Stoddart recommends starting with the inside surfaces, removing foliage that has stuck to the covering. She suggests a hose spray and sponge or soft brush.
Should the outside cover be cleaned immediately?
Stoddart generally waits until most autumn leaves have fallen, since more can collect on the exterior over the coming weeks. She says to remove debris from the covering when cleaning.
How can growers balance warmth and ventilation?
Her advice is to keep doors and windows closed more often as temperatures drop, but to open them briefly several times a week where possible. The article does not prescribe a schedule for every crop or structure.
Does Stoddart recommend washing every seed tray?
No. She says she usually empties trays, shakes planters and stores them without cleaning, but advises considering extra cleaning if a particular pest or disease is a concern.
Source: amateurgardening.com
