Tammy sounds like your going into construction bussiness. If you have an Freecycle.com in your arera you could probably get a lot of it free on there. I got some 6"by12" circleular bricks that way also got some super tomato cages actually they are metal waist paper racks that fold up got them around my tomato's Your just planting you Tomato's I am eatinmg mine as well as
peppers. Meg I have some Zebrina
seeds I will be glad to send I have them posted on my photo bucket trhey are kinda purplr and white striped mine are 6' tall and about 4'wide. Also like Tammy said
rose of Sharon get about 10' and 4 to 8 foot wide as
tree could be trimmed to be a bush that would go in your triangle.
Jimmy