Alogyne huegelii is an Australian native Hibiscus. It grows into a large bush with showy large purple flowers. It can grow at least 2 metres high and 2-3 metres in diametre. it can be cut back severely and will sprout again and again.
Climbing roses make a good backdrop to any garden. They need good support to train the canes on. They need cutting back each year.
Turk's cap or Malvaviscus drummondii can grow into a big bush. I was unable to keep it in check in the last couple of years. It grew to 2 metres tall and 4 metres in width. You can keep it smaller by trimming. It is a perennial and has soft wood so it is easy to cut. It is adorned with bright red upright flowers all over. Only rarely will these go to seed.
Remember to plant your trees first as they are the largest of all.