I want a tiny outdoor greenhouse and i am not sure what i should go with or if i should go with a greenhouse at all. I live in southern onatrio and we usually get quiet a bit of snow and it can sometimes go down to -29 degrees celcius with wind chill, that rarely happens but it has. So should i go with a greenhouse if so the plastic ones, or hard plastic ones, shouldi have a heater in it or what, need helpppp!

One of the big problem with small greenhouses is that they over heat very quickly in the sun, and they also lose their heat very quickly at night. For this reason, that is why greenhouses are built 11 to 16 feet tall. You MUST have a heater that has the capability of keeping the greenhouse at least 60 F (16C) above outside temperatures, to insure protection of your plants on extremely cold nights, if you wish to use the greenhouse in the wnter months. A double layered poly greenhouse with an air layer inbetween is more cost effective than a hard plastic greenhouse to heat. - Millet

So it wouldn't be good to go with an 8' length*6' wide*8' tall.

Millet is right in that it's very difficult to control the heat in small greenhouses.

I have to do this due to space limitations and the problem is trying to not let sudden changes in temperatures happen in Winter. It's a lot of trial and error and some citrus are more affected by low or changing temperatures to others.

A lot of heaters are designed for bigger greenhouses but they are just too powerful (or good) for a small one.

I've used a fan heater in a 6 x 2ft greenhouse and just about managed not to kill the trees in it last winter. A lime did suffer as they like it hotter but next winter I've been recommended to build a small frame around it in the greenhouse and cover it with bubble wrap or fleece to keep it warmer and less affected by temperature changes. This would also stop the soil in the container getting too cold affecting the roots.

Mind you, in the UK where I am, temperatures only go down to -5 degrees C and occasionally down to -8/9

Valenciaguy, a 8X6 greenhouse will need constant attention to keep the temperatures within healthy growing conditions. You would definitely need to put a shade cloth over the greenhouse during the summer, and automatic fans to help keep the greenhouse from over heating. - Millet

What would happen if i got one of those little space heaters that have an automatic temperature setting and they only turn on when the temputature goes lower than that tempurature.

Maybe look at buying a small cylinder heater for an 8 x 6

They cost more than fan heaters but are much much better. Some of them will blow out and circulate cool air in Summer and do the same with heating in the winter.

This site in the UK will show what can be used (scroll down to the cylinder heaters)

http://www.cmsgardens.co.uk/heaters.htm

May be you can find a site where you are.

I've got a fan heater in my 6 x 2 and as said above it's very difficult to get a constant temp. Last Winter I managed to get it to stay within a 5 degree C range, but the higher the min temperature you are trying to stop falling below, the harder it is to control temperature which isn't good.

1 I totally agree with millet about small Green houses Over heating..
i have an 8x6 thats always going to aboput 100-120 daily so i just use it to start seeds .. and my banana plants i also have a mister and a shade cloth on it to stop burns ...

My big Green house is at around 80-90 daily ..

if your really wanting a small Green house make it bigger then what you think you want as im wanting another one bigger now its just an addiction for me to go to ebay and buy tropicals ..

I need an EA Group for my addiction for ebay
and a TA for my tropical addiction
and a OA for my Salt water tank addictions ..Tammy

Thanks that link is was great and ya i would like one bigger than 8x6 it is just i don't have a lot of room or money right now so i will stay with the greenhouse in my house it does a great job for now because my plants aren't that big i am just planning for twhen they do get bigger. I will have to start putting them in my bed cuz i am won't have enough room