This greenhouse is a game changer if you garden in upper Michigan where the growing season is 3 months at best.  It added a month to my season and this year I'm trying to start things 6 weeks early.  I ordered the green ones for my son this year because they won't burn the plants as easy and he lives in lower Michigan where it is warmer.  I open zippers during day so the ground doesn't mold from excessive condensation or get to warm.