Species threadleaf giant hyssop Guide
orange flowers with purple foliage and green-purple stem

threadleaf giant hyssop

Agastache rupestris 'Apache Sunset'

Cycle:

Herbaceous Perennial

Watering:

Average

Propagation:

Division,Cutting,Seed Propagation,Layering Propagation

Hardiness Zone:

6 - 9

Flowers:

Orange-pink Flowers

Sun:

full sun,part shade

Leaf:

Yes

Leaf Color:

green,red,yellow

Growth Rate:

Low

Maintenance:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Care Level:

Medium

watering

Water threaded giant hyssop plants about once per week, ideally in the morning. Water until the soil is moist and water begins to run from the bottom of the pot. Do not allow the soil to become soggy. During periods of very hot summer weather, water up to 2 times per week in the morning. Reduce watering during the winter months as plant growth slows down during this time.

sunlight

Threadleaf giant hyssop grows best in full sun, meaning at least 6 hours of sunlight, preferably during the most intense time of day (around midday). If grown in less than full sunlight, the plant may be weakened and more susceptible to disease and insects. In hotter climates, however, it may benefit from some filtered afternoon shade or morning sun. It’s important to remember that intense afternoon sun can be too much for the plant in certain climates.

pruning

Threadleaf giant hyssop can be pruned at any time during the growing season. We recommend pruning it lightly in late winter, just before new growth emerges in spring, then again early in summer to encourage denser bushy growth. In general, prune no more than 1/3 of the plant, removing the tallest stems and branches to encourage horizontal branching and a fuller plant form. If necessary, lightly prune in late summer as well.