herb
Mint
Vigorous, useful, and genuinely invasive if you put it in a bed.
Growing
Always in a container. Runners will travel metres underground in a season and are very hard to remove afterwards. Mint likes more water than most herbs.
Harvesting
Cut whole stems near the base rather than picking leaves; the plant regrows faster.
Using
Fresh in salads and drinks, dried for tea. Peppermint and spearmint are different plants with different uses — spearmint for food, peppermint for tea.