Also known as Figwort Giant-Hyssop · Purple Giant-Hyssop
Agastache scrophulariifolia, purple giant hyssop, is a striking herbaceous perennial with fragrant foliage and spires of lavender-purple flowers that attract pollinators.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Prefers at least 6-8 hours of direct sunlight daily for best flowering and growth.
Moderate to Low
50% intensity
Water regularly until established, then reduce frequency. Allow soil to dry slightly between waterings.
Well-drained
50% intensity
Moderate
50% intensity
Thrives in average garden temperatures; hardy in USDA zones 4-8.
Outdoor
50% intensity
Low
25% intensity
Generally does not require much fertilizer; benefits from compost if soil is poor.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | Yes |
Non-toxic
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water regularly during the first growing season to establish a strong root system. Once established, purple giant hyssop is drought-tolerant.
Water deeply when the top 2-3 cm of soil feels dry, especially during prolonged hot and dry periods. Avoid overwatering, which can lead to root rot.
Deadhead spent flower spikes to encourage repeat blooming and maintain a tidy appearance. Cut back the plant in late autumn or early spring to about 10-15 cm above the ground.
This removes dead foliage and helps promote vigorous new growth in the following season.
Purple giant hyssop can be propagated by seed or stem cuttings. Sow seeds indoors in early spring or directly outdoors after the last frost.
Take softwood cuttings in late spring or early summer and root them in a moist, well-draining medium. Division of established clumps in spring is also effective.
As Agastache scrophulariifolia is typically grown as a perennial in the ground, repotting is generally not a concern for established plants. If grown in a container, repot young plants annually or when they become root-bound, usually in early spring before new growth begins, into a slightly larger pot with fresh potting mix.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Purple Giant Hyssop (Agastache scrophulariifolia)
Where Purple Giant Hyssop (Agastache scrophulariifolia) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Lamiales |
| Family | Lamiaceae |
| Genus | Agastache |
| Species | Agastache scrophulariifolia |
Similar in genus Agastache
Answers based on plant encyclopedia data
