My herbs are bolting

Bolting is when a plant goes to seed. Unfortunately, three of my herbs have bolted, leaving the leaves puny and either too strong or too weak in flavor.

I need to deal with these mint seeds before they spread and take over the world.

The leaves are called cilantro; the seeds are called coriander.

Dill eeds are as airy as the dill leaves themselves.
I plan to use the seeds in pickles (thinking positively about my cucumber plants).

Here's an idea: Herb blocks

If you already have some concrete blocks, like I did, why not line one edge of the garden with them and plant them with herbs? Last spring I filled the holes with the same rich dirt as my garden. All my herbs came up except the chives, and I am trying those again.