c Insulating the greenhouse for Winter | Garden, Tea, Cakes and Me

Insulating the greenhouse for Winter

My greenhouse is unheated, so during the winter any plants inside are afforded little protection from frost. Previous years I have lost young plants, even though they were protected with fleece. I do not want to heat my greenhouse, although I know this would solve my problems and also help come Springtime with early seeds sowing. My alternative is to insulate my greenhouse overwinter with... bubble wrap. Used by many gardeners and if its good enough for one of my favourite Gardeners World presenters Monty Don, its good enough for me.
how to insulate greenhouse for winter
How to insulate your greenhouse for winter
How to protect your greenhouse and plants through winter without too much expense.
  • Bubble wrap or packaging you sometimes find inside parcels makes an excellent insulation. Use a strong tape to to attach it to the windows. As you can see from the photo below all my windows are well covered and protected, with the exception of a few panes in the roof. 
  • You can of course buy bubble wrap which you can store to be reused each year. Although if you are a savvy gardener like myself start collecting bubble wrap through the year, making sure family and friends now of your need too.
  • To keep the environment inside the greenhouse healthy during winter you should remember to ventilate your greenhouse. You will be checking on your plants any way, so opening the door or window on a sunnier day is always a good idea.
how to insulate greenhouse for winter
Bubble wrapped insulated greenhouse
Plants to over winter
Typically plants I over winter include:- 
  • geraniums  
  • Aeoniums
  • Young perennial cuttings.
  • sweet pea seedlings 
  • broad bean seedlings 
how to insulate greenhouse for winter
How to insulate your greenhouse for winter

I would love to know if you have any tips for keeping your greenhouse frost free over winter. Someone once suggested that if a heavy frost is forecast, its worth lighting a few tea lights in the greenhouse just before you go to bed. Apparently they keep the temperature just above zero.
how to insulate greenhouse for winter


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3 comments:

  1. Hi, thanks for the follow, am following back. I like how you've called it a thermal vest. I don't have any tips unfortunately as I don't have a greenhouse and I'm not brave enough to overwinter anything inside!

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  2. Google for 'thermal mass' -- too long a comment for me to explain here. Using barrels of water and all the stones, bricks and concrete pavers I can fit into my greenhouse mediates the temps by 5 to 7 degrees fahrenheit. Predicted temps below freezing, I use a small electric heater to supplement. Also google for 'Rocket Heater,' a notion I haven't tried.

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