We have a greenhouse that is on concrete slabs and we have plants such as
geraniums in all over winter and they are in flower most of the year. We do
not place anything on the floor, we do have a small heater tube in the
greenhouse and a couple of years ago we had christmas lights in the
greenhouse and they gave off enough heat to keep the frost out. Some of our
geraniums like the Black Prince is over 20 yrs old.

regards pam
"Paul Giverin" wrote in message
...
Hi there,

This year, after many years of threatening, I finally got a greenhouse.

I'm really pleased with it even though I was a bit late (May) to make
full use of it this year but I'm really looking forward to next year and
getting a full load of seedlings on the go. In the past I've had to use
the window sills in the house which limits things and looks untidy.

Anyway I digress. The greenhouse is erected on a concrete plinth that
was previously used for an aviary. I felt (rightly or wrongly) that I
needed to do something to insulate the concrete because I though it
would be quite cold. I used two or three bags of cheapo compost and
spread it on the floor.

Now I'm wondering if there was a better alternative or whether I need to
use anything at all. I intend to use the greenhouse to over winter a
load of our plants which are in terracotta pots and prone to cracking
with the frost. I've got some bubble wrap and will shortly begin to
lining the greenhouse with it. I've also invested in an electric heater
to keep it frost free but also to help get a head start with next years
seeds.

Any advice with the flooring appreciated.

Cheers,

--
Paul Giverin

British Jet Engine Website http://www.britjet.co.uk