Why aren't we South Australians all growing this stunning plant? Sturt's Desert Pea (Swainsona formosa) requires absolutely no water after germination and the seeds remain viable for hundreds of years! Seeds are available, evidently, from State Flora in Belair National Park.
Its one need is very good drainage and preferably sand. These are photos of when I grew it in the summer of 2007, in a very sandy patch of soil that the previous house owners must have used to backfill behind a retaining wall. They grew to be about 60cm wide and high. If your children have grown out of their sandpit, fill it with these!
As you can see at the bottom of this second photo, in the middle, it is a true pea and forms pea pods. The "eyes" of the flowers go from red to black as they mature and each spray forms a circle around the stem. I have no idea why I didn't collect the seeds or if I did, what happened to them but I am going to try growing them again. I don't know when to sow them, but I will find out!
If you want to do the permaculture thing and make sure everything you plant has 3 or more uses, then here is one such plant for all South Australians..... they will attract native birds to be your pest controllers, they require no extra watering, they must be one of the most mesmerisingly vibrant plants in the whole plant kingdom and they are all our's!