How to Grow Giant Hyssop (Agastache)

Giant hyssop is a sun-loving flowering plant that blooms in summer in shades of coral, red and purple. It has tall flower spikes - to 3 feet - covered with small, tubular blossoms.

Instructions

Difficulty: Easy

Things You’ll Need:

• Bypass Pruners
• Compost Makers
• Fertilizers
• Garden Hoses
• Hand Cultivators
• Mulch
• Plants
• Seeds

Choosing Giant Hyssop

1. Shop for giant hyssop in spring and summer in nurseries.
2. Look for plants in containers ranging from 4 inches in diameter to 1-gallon size.
3. Choose healthy-looking plants with no wilted foliage. Stems should have flowers almost to the base of the plant.

Planting Giant Hyssop

4. Plant giant hyssop in full sun in well-drained soil.
5. Add a light application of organic fertilizer to the planting hole.
6. Loosen pot-bound roots by dragging a hand cultivator - a tool that looks like a claw - down the sides.
7. Place plants no deeper than they were growing in the containers.
8. Set plants 6 to 12 inches apart.
9. Water well until soil is completely moist.

Caring for Giant Hyssop

10. Cut back stems in early spring with bypass pruners. Leave 4 to 6 inches remaining.
11. Cut off flowering stems when they are finished to the first set of leaves. This will produce more flower stems.
12. Protect container plants from cold winters by placing in a protected spot against the house or by wrapping the container in bubble-wrap used for mailing.

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