Yes. In Jainism, cauliflower is allowed for most followers because it is an above-ground vegetable, not a root or underground tuber. The common Jain principle is to avoid kand-mool (root/underground vegetables) to minimize harm to life in the soil, and cauliflower does not involve uprooting the plant. This guidance is shared by both Digambar and Śvetāmbara traditions, though local practices can vary slightly during certain holy periods. For everyday meals, many Jains include cauliflower as part of their vegetables.

You can read more here