I have a really boring backyard patio so I thought I would spice it up with flowers but I could not find a plan for a large right angle planter. So I made up my own.
The planter is made from cedar fencing but pine for the top trim and the corner legs. The legs have grooves that the sides slide into and are not screwed or glued in place. That is so you can remove the top trim and then just pull the sides out to replace them as needed or to even change the size of the planter.
This planter is 18" high so it is comfortable to sit on but that also means you will need a lot of soil to fill it up. Mine took 26 40lb bags which is over 1/2 ton of soil. Add water and that planter is here to stay. But it also means that there is a large tendency for the sides to bulge along the bottom so I placed stop blocks along the bottom base and screwed into the base.
I planted Angelonia for color and sage, oregano, and thyme for spice. It was fun to build and came out well but it was expensive as the soil along was nearly $60. Add another $50 for lumber and screws and you have exceeded the magic $100 mark. Still a good deal, however.