I always just planted several seeds in a pot.

So there's no way to propagate more roots from just the plant itself? I guess coriander seeds are cheap enough, I'll give it a try

It's not a perennial, but an annual. It grows, goes to seed, and dies. Propagating roots is a fruitless task. In a garden, many folks set it up to where it reseeds itself, so they have it growing back each year.

Seeds are the way to go! It likes cooler weather so fall is a great time for growing cilantro.

FataMorgana