How to Trim Agastache

Agastache is a vertical-growing flowering plant also known as hyssop. Some varieties of agastache plants are perennials, while others are tender plants that die back at frost. However, they are all heavy producers of seeds, which lie dormant in the soil before germinating in spring. Agastache requires trimming after the first frost kills the stems.

Hand pruners
Garden gloves
String
Pruning shears or loppers
Rake

Instructions

- 1
  Wait until the agastache stems develop flower blooms and then begin trimming back the dead blooms daily or weekly to encourage new blooms. Use hand pruners to trim the stems 1/4 inch below the dead flowers.
- 2
  Wait until fall months when frost begins to occur, and monitor the agastache plant stems until they turn brown. Some varieties die back immediately but others can last until winter.
- 3
  Don gardening gloves, then gather all of the dead stems together and tie them into a clump with a piece of string. Position the string at least halfway up the stems and tight it tightly in a knot.
- 4
  Cut the stems off 1 to 2 inches above the ground, using loppers or pruning shears and cutting straight across all of the stems.
- 5
  Throw away or compost the bundle of stems.

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