How to Store Crop Covers to Extend Their Lifespan

Illustration of young plants protected by an open cold frame

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Storing crop covers correctly is the most effective way to extend their lifespan, reducing the need for frequent replacements and minimising plastic waste in the garden. Because materials like polypropylene fleece, polythene sheets, and insect-proof mesh vary in durability and chemical composition, they require different handling to prevent degradation, tearing, and pest contamination.

Table of Contents

Cleaning and preparing covers for storage

Storing a cover that is soiled or damp is a primary cause of premature failure. Organic matter trapped in the fibres of fleece or the folds of polythene can encourage mould and mildew growth during the winter months, which weakens the material structure.

Rinsing: Woven polythene and insect-proof mesh should be rinsed with water to remove soil, salts, and organic debris. For durable woven meshes, a gentle rinse is usually sufficient to clear the surface before drying.
Drying: Never fold or roll a cover while it is still damp. Moisture trapped in folds can lead to rot in plant-based materials or fungal growth on synthetic ones. Ensure covers are completely dry in a shaded area; avoid leaving them in direct, intense sunlight for extended periods while drying, as UV radiation can begin to break down the polymers.
Inspection: Check for rips or holes. For insect-proof mesh, repair small holes using a patch or repair method approved for that material. Check that the repaired area has no gaps large enough for the target pest.

Storage methods by material type

Different covers react differently to pressure and folding. Using the wrong method can create permanent creases that lead to stress fractures in the material.

Horticultural fleece

Fleece is a non-woven, fibrous material. While lightweight, it can be easily snagged. To store fleece, fold it loosely into a rectangle rather than stuffing it into a bag. This prevents the fibres from becoming overly compressed or distorted. Avoid using tight elastic bands, which can leave permanent indentations or tear the delicate fabric.

Polythene and aerated crop covers

Transparent polythene sheets are prone to cracking if folded sharply in the same place every year. The best practice is to roll these covers loosely around a cardboard tube or a clean PVC pipe. Rolling reduces the number of sharp creases and makes it easier to deploy the cover in spring without struggling with stubborn folds.

Insect-proof mesh

Because mesh is often larger and more durable (some lasting up to ten years), it can be folded more firmly than fleece. However, to maintain the integrity of the mesh size—such as the 0.3mm to 1.4mm gaps required to exclude specific pests—avoid heavy weights being placed on top of the stored mesh, which could flatten or distort the weave.

Optimising the storage environment

The location where you store your covers is as important as how they are folded. The goal is to protect the materials from environmental stressors.

UV Protection: Store all covers in a dark, opaque container or a shaded shed. UV light is the primary enemy of polypropylene and polythene, causing them to become brittle and break into small pieces.
Temperature Control: Avoid storing covers in areas prone to extreme temperature fluctuations, such as an uninsulated lean-to that freezes in winter and overheats in summer. Stable, cool temperatures help preserve the flexibility of the plastic.
Pest Prevention: Store fully dry synthetic covers in robust containers with well-fitting lids. Bags alone may not exclude rodents, so inspect stored material periodically.

Organising multiple cover grades

Gardeners often use different weights of covers for different purposes. Mixing them up can lead to using a lightweight cover when frost protection is required, or vice versa.

Create a simple inventory system by labelling your storage bins. For example, distinguish between:

Lightweight fleece (e.g., 17g per sq m): Used for advancing young seedlings.
Heavy-duty fleece (e.g., 35g per sq m): Used for protecting tender plants from frost.
Fine mesh (0.8mm): Used for excluding flea beetles and leaf miners.
Standard mesh (1.3-1.4mm): Used for cabbage root fly and butterflies.

Handling biodegradable and natural covers

Covers made from sheep’s wool or plant-based biodegradable materials require stricter storage than synthetic versions. Because they are designed to break down in the environment, they are more susceptible to moisture.

Strict Dryness: Natural fibres can absorb more water than polythene. Ensure these are bone-dry before storage to prevent premature biodegradation.
Airflow: Store natural covers in breathable cotton bags rather than airtight plastic bins to prevent mustiness, provided the area is dry and pest-free.
Avoid Soil Contact: Ensure the storage container is raised off the ground (e.g., on a shelf) to prevent ground moisture or soil microbes from initiating the decomposition process while the cover is in storage.

Useful products for this job

The links below open Amazon UK product searches. Check the exact item, seller, current price and compatibility before buying.

Horticultural fleece: The article discusses specific storage needs for different weights of fleece. Check the weight (g per sq m) to ensure it provides the required level of frost protection. Search Amazon for Horticultural fleece.
Insect-proof mesh: Mesh has a longer lifespan and different storage requirements than fleece. Verify the mesh size (mm) matches the specific pests you need to exclude. Search Amazon for Insect-proof mesh.

Related garden guides

Sources and further guidance

Guidance researched in September 2026. The feature image is an AI-generated illustration. Product guidance is based on published information, not hands-on testing.