It seems like you might have meant herbs instead of ERPs.

If that's the case, herbs can be classified in various ways depending on their uses, life cycle, and plant family.

There isn't a strict number of herb types, but they're generally grouped into categories like culinary herbs, medicinal herbs, aromatic herbs, and ornamental herbs.

Culinary herbs.

These are used in cooking such as basil, thyme, and parsley.

Medicinal herbs, used in traditional medicine like chamomile, echinacea, and ginseng.

Aromatic herbs, grown for their scent such as lavender, rosemary, and mint.

Ornamental herbs, primarily valued for their appearance like ornamental oregano.

Additionally, herbs can be annuals, biennials, or perennials depending on their life cycle.

Each category can have many examples, making the world of herbs vast and diverse.