Greenhouse - Winter Power Savers ?

Discussion in 'Greenhouse Growing' started by ricky101, Aug 20, 2022.

  1. ricky101

    ricky101 Total Gardener

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    Hi,

    With the expected power price increases this Autumn and Winter we are considering delaying our usual earlish start to the 2023 season and looking a ways to reduce the electricity used in the greenhouse.

    This will probably involve keeping fewer tender plants over Winter and starting things off much later like April instead of early March under heat.

    Also sectioning off half the greenhouse with bubble wrap so its cheaper to keep the remainder frost free.

    Wonder what others are thinking of doing ?
     
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    • burnie

      burnie Total Gardener

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      Good thinking, I don't grow up here in the winter, just plunge pots in the soil and cover everything with fleece. I'm fortunate to have a nice double glazed conservatory to keep the delicates in and also start things off like the Onion seeds in the propagator in there.
       
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      • pete

        pete Growing a bit of this and a bit of that....

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        Not really sure yet, to be honest for years now my greenhouses have been full to bursting with frost tender plants every winter.
        I keep them at about 3c, just to keep the frost off, not wanting any thing to actually grow until late February when I get the propagator going.

        I've got the conservatory that I heat but since replacing the roof the light is not what it was.
        Might have to set up grow lights in there for any thing special.
         
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        • JWK

          JWK Gardener Staff Member

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          I will have to cut down somehow, I have already earmarked a few tender plants that will go into the cold greenhouse, they will probably die. I was actually considering keeping less anyway as it's quite a struggle lifting some of them in pots. I will try sectioning the heated greenhouse and lower the temp from 6 to 3c.

          Some will come indoors as a trial, I've got a couple of large containers.

          I won't start the growlamps till the spring, last year I started onions under lights in December. They will have to make do with less light.
           
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          • pete

            pete Growing a bit of this and a bit of that....

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            I'm hoping for a mild winter, it could make a big difference cost wise and what plants survive.
            Lets face it , it wasn't until WW1 that they found out Camellias are pretty much totally hardy.:biggrin:
             
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            • JWK

              JWK Gardener Staff Member

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              I'm going to wrap my Brugmansias etc with fleece inside the heated greenhouse then with a slightly lower temperature they should survive. Last winter I left a brugmansia in the unheated greenhouse, it didn't die but it hasn't flowered yet so that's probably worse considering the extra compost, feed and water I've been giving it.
               
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              • pete

                pete Growing a bit of this and a bit of that....

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                I left a brug cutting on the allotment last winter , I just piled chipping round the base, it survived but came back far too late to flower this this year, losing all top growth.

                I'm giving up on brugs anyway, they just seem to be lots of hassle for a big mess on the ground mostly. I know they look good when in full flower but I'm having a rest from them.
                 
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                • CarolineL

                  CarolineL Total Gardener

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                  I've always lined the bottom panes of my greenhouse with house insulation batts (I would have preferred a half walled one but they are costly). The heated section was kept below 5 last year - I'll set the thermostat even lower this year, and ensure I get big bubble plastic for lining it.
                   
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                  • shiney

                    shiney President, Grumpy Old Men's Club Staff Member

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                    Although our greenhouse is crammed with plants every winter (and summer) only some of them are kept in the heated propagators. I shall reduce the temperature in them quite a bit (always have been much too profligate with the leccy :noidea:). I shall cover them with a second layer of plastic.

                    They are 5' x 3' and 2' x 3' and I think that stops the whole greenhouse from getting too cold. :fingers crossed: The cables are in 6" depth of sand and gravel with thick shelving as the framework. I'll extend the plastic that is normally draped over them so that it comes down past the benching. I can then put some of the semi-tender plants under the benching. I've never bothere to do this in the past.
                     
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                    • Jocko

                      Jocko Guided by my better half.

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                      I won't use the heat mats in my potting shed this winter. I will start things later under the LED lights.
                       
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                      • WeeTam

                        WeeTam Total Gardener

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                        Still on a fix but next year will be buying a big round straw bale to wrap any delicates in. This year its the quality big bubblewrap again, reflective insulation on north facing wall and all gaps taped up.
                         
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                        • Loofah

                          Loofah Admin Staff Member

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                          You could try piling some bricks to create a thermal mass, heating during the day then giving off at night. Not entirely sure how effective it would be but might be worth a try. Also a blowaway greenhouse inside the main greenhouse as a double dose of protection.

                          For me, I need to add a roof to the greenhouse as it collapsed!
                           
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                          • pete

                            pete Growing a bit of this and a bit of that....

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                            A roof, now that sounds like a good idea. :biggrin:
                             
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                            • JWK

                              JWK Gardener Staff Member

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                              I tried a green cone inside mine one winter, it's a large double insulated food composter, all the kitchen waste including meat can go in there. I only fed it green vegetable waste, grass clippings etc hoping it would raise the temperature a bit. It didn't make a jot of difference.
                               
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                              • pete

                                pete Growing a bit of this and a bit of that....

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                                Don't think I would have room for anything like that.
                                Often I can hardly get in the door.
                                 
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