1. I have Lily speciosum rubrum. I have moved it once, and I think I need to move it again. It gets very tall--5 feet, but it will not stand up right. It goes up about three feet and then arches over. It sprawls over the area it is growing in reaching towards the grassy lawn. This lily is in bright shade with about one hour of sun up against the north side of the house. The information in the catalogs shows sun to part shade. I am considering putting this lily in full sun. I don't have much "part shade". It is mostly either "sun" or "shade". I do have a berm that has roses in it in full sun. I was wondering if it would stand up right in that area? It would get "some" shade from the roses that get 5 to 6 feet tall over the summer.
2. What companion plants do you plant with this lily?
I feel like I sort of have this big sprawling monster of a plant that doesn't stay upright.
Sounds like it needs more sun, and anything right up against any structure (house or fence) is going to lean. Try the east side of your house or out in the garden where it might get some shade in the hottest part of the day. It doesn't have to be real close, just where the shade from a tree falls. Hope that helps.