Before you hurl your prunings or, later in the year, the border trimmings onto the heap or feed into the chipper, it might be worth evaluating what you have in…
These plants will often self-sow and you should remove the flowers before they set seed, if this becomes a problem.
You can divide the overgrown clumps in the spring or sow the fresh seeds outdoors in the summer. Self seeds freely.
Pests, diseases or disorders
Slugs and snails may damage young foliage.