These hibiscus are a true annual. They self-sow quite well, which is nice because the more plants you can have in a given area the better. The flowers bloom when it is sunny and only last one day, so if you only have a couple plants, you will not get a good showing. They get about 18"-2' tall and have an airy feel to them (not bushy). They are pretty sturdy and don't need staking. They will grow in some pretty awful soil, and have yet to seed out in some of the richer soils in my garden. The soils that they show up in most are just average soils with some clay. The seeds are easily collectible and they are easy to start. The plants transplant pretty well, so it is easy to just move plants that are too close together rather than wasting them by thinning. I usually space them about 6-12" apart. The foliage is better seen when they aren't crowded, but you get a better flower show when they are bunched closer together, because you can get more plants in an area. They like full sun to mostly sunny spots. They have no extra water requirements and take the heat really well. In fact right now many of my plants are suffering due to the heat wave that we have been experiencing and these little guys are simply thriving in it!