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Greenhouse temperature during winter

• Message 1. 

  Posted by cool_breeze_uk (U14359426) on Sunday, 28th November 2010

  I have a number of potted specimens rounded up from the garden and now residing in the greenhouse for the winter. They vary from tender to half hardy. I have a small electric heater in there which is on continuously at the moment and is maintaining around 8c. I don't wish to grow anything, just keep the existing plants free of frost and damp, but still dormant. I'm a little concerned about the potential cost, being only November and this freezing weather set to continue. Is there a recommended minimum temperature to maintain? Many thanks

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• Message 2

  , in reply to message 1.

  Posted by As_Iff (U13951957) on Sunday, 28th November 2010

  Plants that are tender are usually safe down to about 10c.
  If you are in any doubt, or worried about the cost, you could perhaps bring the most tender ones indoors, maybe put them in a cool spare bedroom.
  

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• Message 3

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  Posted by Toadspawn (U2334298) on Monday, 29th November 2010

  Ask yourself the question -
  How important is it for me to keep the plants overwinter? Are they valuable or have a special connection and need to be kept at all costs or can they be easily replaced in the spring?
  If you need to keep some of them try and make room in the house. If they can be easily replaced, turn off the heater to save money, wrap them in fleece if it gets very cold and let them take their chance.
  Many of the supposedly half hardy plants can be surprisingly resilient if they are kept dry.
  

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• Message 4

  , in reply to message 1.

  Posted by Palaisglide (U3102587) on Monday, 29th November 2010

  Cool-breeze,
  You are blowing money away. The best heater is like mine an electric fan with frost guard made especially for greenhouses.
  Put your plants down the middle of the greenhouse on the floor and cover with fleece then bubble wrap. Stick canes in the pots to keep the fleece and bubble wrap off the plant itself, if they are all together a light frame would do it.
  On warm days remove the cover and replace at night.
  The point being the nearer the floor you are the warmer it is, often quite a bit warmer as stone or brick will hold heat and air loses it.
  Plants can often stand low temperatures as long as they do not freeze so reduce water keeping the plants barely damp but not dust dry.
  Hope this helps.
  Frank.

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• Message 5

  , in reply to message 4.

  Posted by cool_breeze_uk (U14359426) on Friday, 3rd December 2010

  Very much so. I have acquired an electric heater I imagine very similar to yours; also a fan it comes on at 5c and is set to go off when the temperature reaches approx 8c. Smaller pots of tender plants now adorning the bedroom window, which does mean lowering the room temperature considerably so growth isn't restarted, but worth keeping them for next year as a lot of time invested in their culture. The bigger pots are on the greenhouse floor, but I'm not too sure about the logic; I thought cold air sinks and warm rises..? Thanks all for your help anyway.

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