If your basil is still alive (even if the top leaves have frost damage), you can take cuttings and root them in water. Choose a stem that is green and remove any flowers and all but the smallest ...

Frost-damaged plants are easy to spot, their growth becomes limp, blackened and distorted. Evergreen plants often turn brown and the leaves of tender plants take on a translucent appearance.

Adelaide Plains grain grower Nathan Parker said the frost wiped out the majority of his barley, wheat and lentil ... show some level of empathy [for] the damage caused by the frost," he said.