I don't use Boo but I've got about 9 made up now from brush (privite hedge to be exact). I'm going to make a few more early in the week and drop them all come Thrusday. As for the crete it is expensive and I had 5 sacks at $21 to make those 9 buckets. Those buckets can get expensive as well so I used boxes, some were too big though I found out and it takes too much crete to even out. I like like using those popcorn tins they work well, used a couple this last time. I did it all myself and I can tell ya it's tough to keep the structure stood up in your container while your filling. I have them leaned up against anything and everything so they don't fall over til it sets. I don't know how many to put per area but was thinking of trying 3 per spot?? Maybe somebody could tell you more about that who's sunk a bunch of them.

