In message , Judith Lea
writes
In article , June Hughes
writes
Depends where you live. We are in north London and mine is tiny and
is unheated, although when I get round to it, I shall buy a paraffin
heater for it. I usually put down some seeds in boxes in late
Feb/March and cover them with newspaper to germinate, putting a lid on
the tray as well. You could also use fleece, which I find very useful
for protecting seedlings. If you read the instructions on the seed
packets before you buy, you will see that they are generally very
clear about when it is safe to prick out seedlings or put them outside.

Hi June, I also have an unheated greenhouse; it was heated with a brand
new paraffin stove. I put in my tomato plants very early and lost the
lot. One morning the entire glass inside the greenhouse was covered in
black, when I looked in , the plants were covered in soot - it was
evident that there had been an explosion of some kind; what we never
found out, Edward said it was something called a "blowback?? but I
have never risked lighting it again

Blimey, Judith! That has put me off a bit, although my first
father-in-law had several paraffin heaters and never came to any harm.
--
June Hughes