Some additional thoughts on those greenhouses:
As mentioned, that's the second. They're both cheapy-Chinesy from the Ocean State Job Lot:
That said, the first one lasted a couple years, and was up year-round. The zippers started getting a little hinky, the Velcro lost its stickiness, but the coup-de-grace was the windstorm the Friday before Christmas that beat the crap out of it and tore one of the roof seams on the cover. (And looking at the other seams, none were in good shape.)
Photo of the new one is up a couple of posts. The old one (when it wasn't cut in half to make a cloche):
It was sufficiently opaque one might contemplate using the greenhouse as a place to, um,
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(not that I have).
It was also heavier, not just the cover. When we picked up the new one at the Ocean State, I thought they shorted us a box - surely everything wasn't in there. Except it was. Even though the design was the same, the parts - the tubes and couplers - are noticeably chintzier. Tubes are smaller diameter.
There is only ONE vent window per side instead of two. And speaking of zippers: these are smaller than on the old one, and with tabs only on the outside (which is a pain for me, since on crappy days I like to zip myself inside to do transplanting or whatever). No Velcro - just ribbons. And NO tie-downs or stakes. Securing this thing is ENTIRELY on you. I'm using a combination of railroad spikes, the long stakes I use with the airblown inflatables, and paracord. Not sure if it being more transparent will be better or worse for the plants - definitely NO spanking the monkey in this one, tho.
Even the "directions" are chintzier - the old one had something like a 11x17 folded in half (so four printed pages), this one has:
and that's it.
I'm guessing (hoping) it lasts just this one season - next year with any luck I'll be gardening on the New Hampshire house lot. The old man went to a vo-ag high school and, for a project, built:
so we'll likely build one of those up there. And/or take the old hoop shed frame and cover it in plastic and build some ends for it.