Swainsona Formosa - Life Cycle

Life Cycle

Generally considered to be a short-lived annual, it has been known to persist as a perennial if conditions are favourable. If the roots are left undisturbed, flowering may resume in the next season.

It is well adapted to life as a desert plant. The small seeds have a long viability, and can germinate after many years. Seeds have a hard seed coat, which protects them from harsh arid environments until the next rainfall, but inhibits germination in normal domestic environments. Growers can overcome this dormancy either by nicking the seed coat away from the 'eye' of the seed, by rubbing the seed gently between pieces of sandpaper, or by placing the seed in hot (just off-boiling) water and leaving it to soak overnight.

Once germinated, seedlings quickly establish a deep taproot, vital for desert survival. This means that if domestically grown, they should either be planted in their intended final location, transplanted as soon as possible after germination, or grafted as a seedling on to a different root such as the bladder senna, Colutea arborescens. They do not tolerate disturbance of their roots but, once established in well-drained soil, require little and infrequent watering, and can withstand extreme heat and sunshine, as well as light frosts.

Sturt's Desert Pea is not endangered, but it is illegal to collect specimens of the plant from Crown land without a permit. The plants must not be collected from private land without the written consent of the land owner.