Having good greenhouse anchors is like having good brakes on your car, you'll be glad you have them when you need them. We got a lot of wind here this winter (2023) in Northern California. Wind gusts over 60 mph with trees blown over like dominoes. Our greenhouse is secured by galvanized screw-in anchors set in a duripan layer with the loop end partly exposed through notched concrete pavers. The anchors are attached to the greenhouse frame with stainless steel turnbuckles, nuts, and bolts, all treated with threadlock to prevent loosening. It is possible that a windstorm might destroy the greenhouse, but the anchors aren't going anywhere.
