The short answer

Yes — cauliflower florets and leaves are both fine for budgies.

Why

Cauliflower is a safe brassica that provides vitamins and fibre. Raw or lightly steamed both work well, and the leaves are edible too.

How to feed it

Offer a small floret or chopped piece, raw or lightly steamed and cooled.

How much & how often

A few times a week.