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How to insulate a cold frame


Overview

Insulate a coldframe using polystyrene sheeting, with help from Monty Don.


Do it: autumn



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Talkback: How to insulate a cold frame
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Tracie Watson 28/06/2012 at 00:09

I live in sunderland and have recently taken up gardening, just wondering if I can use a plastic green house as a propagator over winter and would I need to insulate it somehow xx

kate1123 28/06/2012 at 09:58

I believe it is possible to buy a fleece cover for a plastic greenhouse but the biggest problem with the plastic greenhouses is that they have a tendency to get blown over in winter. Which is quite heartbreaking.

Mine never proved to be completely frost free so it was ideal for small hardy perennials/ annuals that needed over wintering but not suitable for propagating pelargoniums/fuchsias etc.

jo4eyes 28/06/2012 at 15:12

Tracie, Kate lives a lot further south than you or me- am in Manchester. So we have colder & longer winters than she does.

Ordinary, low rise coldframes- wooden, plastic, aluminium framed- can be successfully insulated with sheets of polystyrene, such as comes with packaging, around the sides, with extra fleece sheets on top of any plants inside.

I would only tend to use a plastic greenhouse for over-wintering small hardy plants, usually grown from cuttings taken earlier in the year. By well wrapping the actual pots of bigger plants, plus using a couple of fleece sheets over them you should be able to keep some things. Dahlias, pelargoniums & other non-hardy plants I wouldnt personally risk.

I'd certainly search out the actual correct sized fleece cover for your greenhouse & get one, plus extra fleece & be prepared to really secure the whole to a wall/fence as securely as possible. J.

lovelylolcats 19/10/2012 at 08:24

What a great idea!! I may try this with the bottom third of my plastic greenhouse to provide the extra insulation and put bubble wrap across the top to keep it light.