You could use an old wooden ladder cut to about 8'. Lean against the house and hang buckets on each rung with holes for drainage and plant flower or herbs in each one. Easy to move if you have to. The weight of the buckets will hold the ladder in place and you can remove each bucket an move the ladder if you have to.
Hi Carolynn, can you have some cut a piece of plastic lattice to the dimensions that would be just slightly larger than the box, then you can stand it up in the dirt against the house. Here are some other ideas