If you are wrapping pots before a cold spell, think about the roots and leaves separately. Insulating the pot and covering tender top growth are different jobs, which is why one tightly wrapped bundle is not always helpful.
I would use bubble wrap around the outside of a pot where roots need protection, keeping its base and drainage holes clear. Horticultural fleece is a more suitable breathable cover for vulnerable top growth. Before buying either, move the pot to a more sheltered spot if possible and check the plant’s hardiness.
Here is how to put each layer in the right place without making winter damp another problem.
Fleece or bubble wrap: what goes where?
I start with the part of the plant that is at risk. A breathable fleece over foliage helps during a cold spell; bubble wrap belongs around the outside of the pot where it can slow root-zone chilling without sealing the drainage hole. I would buy a manageable roll only after measuring the containers I need to protect, and I remove or vent coverings as conditions improve so damp is not trapped around the plant.
Heavy-duty horticultural fleece
Position: loosely over foliage, ideally on canes where rubbing is likely. Useful for: brief frosts and cold wind around borderline-hardy top growth. Avoid: a tight, permanently wet bundle. Compare heavy-duty fleece.
Reused bubble wrap
Position: outside vertical pot walls. Useful for: slowing rapid chilling of roots in exposed containers. Avoid: covering foliage, the pot base or drainage holes. Compare wrap roll sizes only if you cannot reuse what you have.
Hessian or straw
Loose outer insulation around a pot is a lower-plastic alternative. Secure it against wind and keep soggy material away from vulnerable crowns.
The RHS notes that heavier fleece offers about 2°C of frost protection. That is a modest buffer, not permission to leave a truly tender plant outside through a hard freeze. Its guidance also distinguishes light 17g/m² fleece, which admits more light, from heavier 35g/m² material intended for stronger protection. Check the stated grade and dimensions before buying: “garden fleece” alone tells you very little.
Arrange the pots before cutting the covers
A sheltered position can make the whole job easier. Group suitable pots where they are less exposed, while leaving access to check their compost. Do not pack them so tightly that you must unwrap half the display to reach one dry plant.
Wrap the pot walls rather than sealing the top and bottom. Water still needs to drain, and you need a way to check moisture. Measure the widest part before cutting; a tapered pot may need more material near its rim than measuring the base suggests.
For top growth, give fleece enough support and slack that it is not rubbing tightly over delicate leaves. Secure it against wind, then inspect as the weather changes. A cover suitable for a short cold spell is not something to forget until spring.
If the forecast goes beyond what the plant can tolerate, choose appropriate frost-free shelter. Buying thicker covering is not a dependable substitute for the right overwintering conditions.
Decide whether wrapping is needed at all
First read the plant label for hardiness and consider the site. A sheltered, mature hardy plant in a substantial pot may need no wrapping in an ordinary mild spell. A small container has less compost between the roots and the cold outer wall. Terracotta can also suffer when saturated compost freezes and expands. Position matters: wind and an open patio make a pot more exposed than a sheltered wall.
Move pots into shelter and group them before buying more material. Raise containers enough for water to drain freely; trapped winter wet can do as much damage as cold. If you are planning a display that stays outdoors, see the site’s winter-proof plant ideas as well. For genuinely tender plants, a suitable frost-free place may be necessary; fleece is not a substitute for the right overwintering conditions.
How much bubble wrap does a pot need?
Measure the pot’s widest outside diameter and the height of the section you want to insulate. One complete circuit needs approximately π × diameter, plus an overlap for tying. A pot 45cm across needs about 141cm for a circuit; allowing 15cm overlap makes that roughly 156cm. Two separate pieces with that allowance would total about 3.12m; for one continuous double layer, allow extra for the outer layer and fastening. This is a cutting estimate, not a measured insulation requirement.
Do not count the plant canopy in the wrap height. Keep the lip and compost surface accessible for checking moisture, and keep the base free. A roll can be reused for several pots if its width matches the pot height; compare usable roll length rather than just the headline pack size. Browse bubble-wrap roll sizes only after calculating the total circuits.
How to fit fleece without creating a damp trap
- Check the forecast and the plant’s tolerance. Put a temporary cover on before the first expected frost, not after damage appears.
- Use canes or a loose frame around foliage that could be abraded by a windblown cover. Keep sharp cane ends below the fleece or cap them.
- Drape fleece to the ground or around the container rim without cinching delicate leaves. Secure it so the wind cannot lift it.
- Check moisture and air movement after the cold spell. Remove or open covers during an extended mild period, then replace them when needed.
- Take coverings off in stages once the severe-frost risk has passed, so tender new growth is not suddenly exposed.
A 35g/m² fleece is a sensible starting category when frost protection is the buying reason; 17g/m² is more suited to light crop cover and greater light transmission. Compare 35g/m² fleece sizes against the height and width of the plant plus anchoring allowance. Avoid treating a manufacturer’s temperature claim as a promise for every plant, wind speed or duration of cold.
The useful order is shelter, drainage and reuse first; then buy only the fleece or wrap your pots need. More material around the wrong part of the plant rarely solves the problem.
Sources checked
RHS: preventing winter damage; RHS: fleece and crop covers; RHS: overwintering tender plants by wrapping. Checked 23 September 2026.
