Ya, it is amazing that your plants and system survived your greenhouse being knocked over. Just thought I would through this out as well, I live in the desert where we get very high winds regularly all monsoon season. I worked for a dealership that used the large tent canopies to shade new boats for sale. Along with the normal tent stakes, we also tied the canopies to 55 gallon drums filled with water. The winds were strong enough to bend some of the 2 inch metal pipes used as the canopy frame, but we never had a canopy fall over or fly away. For your much smaller greenhouse I imagine something like about 6 five gallon buckets filled with water would probably do as well (one on each corner, and two in the middle).
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