I love my Juliana Premium 9.9 with 10mm polycarbonate. This is the sturdiest greenhouse I have ever seen. My neighbors will be buying the same soon! read complete review...
I laid down landscape fabric and filled the GH foundation with 4" of
decorative pebbles. I built a small work table along the inside of the
GH opposite the door. Presently the GH has a number of houseplants, all
our water plants from our pond, plus three tomato plants that I dug up
and put in large pots. It is almost the first of December and the GH is
still keeping the temperature generally between 40 and 80 deg F without
a heater.