Well, I've not been up to much in the garden, as you can imagine, but I have re-filled the beds with manure & compost ready for next season. As you have already read I have also put the bubblewrap up in the green house too. It was then going to go on to the next bit about heating it cheaply, but I got beat to it by the Horticultural Channel so in some ways that saved me having to make my own video as I can let you watch theirs.
Now there are a few points I would like to make about this.
First off, there is NO POINT heating your greenhouse unless you have insulated it. All the hot air will just simply disappear through the glass & the metal frame. So make sure you have the bubblewrap up, double layer if necessary.
Secondly those candles do not burn all day, they last about 3-4hrs. You can buy bigger ones which last 8 hours (as I have) but they do work out more expensive, I think about 10p each & you will need 2-4 depending on how much you need to raise the temperature. Also remember that as you are using clay pots even after they have stopped burning the radiant heat will still remain for a while, how long I don't know. (I see an experiment to come)
Thirdly, don't stick it on top of ANYTHING. I know most things in a greenhouse aren't combustible but I'm sure some of you (like me) will have something in there that could. Not only that but as hot air rises you will simply loose what you make. I would suggest you place it on the floor or on a shelf under/nearby any plants that need this extra heat (not too close to plastic pots/trays)
Fourthly & remember I haven't actually set mine up yet as we haven't had any frost (lowest temp in greenhouse so far was last night at 0.2 degrees C) but I think using a ceramic tray maybe safer than a metal one, it will heat up just as the terracotta pots will, using a ceramic or clay one will heat slower & cool slower so keeping heat around longer.
This is a good way to heat a greenhouse for anyone with a plot or without electricity, it still costs less to run than a paraffin heater & also a bit safer (imagine knocking over the paraffin). I actually have electricity in mine & will invest in an electric heater one day, I just don't know if it will be cost effective as I wouldn't need to use it much.
I don't grow plants in my greenhouse over winter but I do store some frost sensitive plants & bulbs (mainly in pots) & I do like to heat it in early spring so I can get a head start on growing.
I hope everyone is safe, it's a bit windy & there is snow up North, we also have flood warnings down here for tonight & tomorrow.