everyone seems to be using spikes... has anyone tried spiral anchors? I think that would hold better even against 50 mph winds... just a thought
edit: just checked some out... things are pricey... thinking that the spikes are a better bet for the price point
We bought bulk 50LB box of 10" Spiral Landscape Spikes from BIC Warehouse $75 (listed as 190 spikes). Delivery was about $20 bucks, took a week after order.
http://www.bicwarehouse.com/Hot-Dipped-Galvanized-Spiral-Landscape-Spike-50LB/dp/B000LNY23M
Way better than the $1-2 each if you buy piece-wise. Sold in 8", 10", 12"; all 50LB box (qty varies depending length). Forgot what size washer used (3/8" fender washer??).