Purple Giant Hyssop (Agastache scrophulariifolia)

Purple giant hyssop (Agastache scrophulariifolia) is a robust perennial herb with fragrant foliage and spikes of purple-blue flowers that attract pollinators.

Above information is sourced from Wikipedia

Sunlight

Full Sun

Watering

Moderate

Soil

Well-drained, average to fertile

Temperature

Moderate

Fertilizer

Low

Care Requirements

Sunlight Requirements

Full Sun

Thrives in at least 6 hours of direct sunlight daily.

Watering Needs

Moderate

Prefers consistently moist soil, but good drainage is essential.

Soil

Well-drained, average to fertile

Temperature Tolerance

Moderate

Hardy in USDA zones 4-8; prefers moderate temperatures, dislikes extreme heat and humidity.

Fertilizer Needs

Low

Benefits from a light feeding in spring; generally low fertilizer requirements.

Plant Overview

Plant Type

Herb

Plant Category

Ornamental

Plant Place Type

Garden, Pot

Lifespan

Perennial

Plant Height

0.9-1.5 m

Spread

0.4-0.6 m

Growth Rate

Moderate

Dormancy

Yes

Leaf Color

Green

Leaf Type

Opposite

Optimal Sunlight Lux

60000

Image Gallery

Flowering & Fruiting Cycles

Monthly activity intensity for bloom and fruit across both hemispheres.

Northern hemisphere

Flowering & fruiting calendar

Peak bloom · JulPeak fruit · Sep

FloweringFruiting

Southern hemisphere

Flowering & fruiting calendar

Peak bloom · JunPeak fruit · Aug

FloweringFruiting

Synonyms

Hyssopus catariifolius Benth.

Hyssopus scrophulariifolius Willd.

Lophanthus scrophulariifolius (Willd.) Benth.

Vleckia cordifolia Raf.

Vleckia scrophularifolia (Willd.) Raf.

Taxonomy

kingdomPlantae
divisionTracheophyta
classMagnoliopsida
orderLamiales
familyLamiaceae
genusAgastache
speciesAgastache scrophulariifolia

Toxicity

Toxic for humans

Rating: 0/5

Toxic for pets

Rating: 0/5

Additional Care Tips

Water regularly, especially during dry periods, ensuring the soil is consistently moist but not waterlogged. Allow the top few centimeters of soil to dry out between waterings. Reduce watering in cooler months, as the plant becomes more dormant. Good drainage is crucial to prevent root rot.

Deadhead spent flower spikes to encourage reblooming and maintain a tidy appearance. Cut back the entire plant to the ground in late autumn or early spring. This removes dead foliage, prevents disease, and stimulates new growth from the base.

Propagate by division of established clumps in early spring or autumn. Carefully separate sections with roots and at least one growing point. Alternatively, propagate from seed sown in autumn or early spring, though plants grown from seed may take longer to establish and bloom.

As a herbaceous perennial, Agastache scrophulariifolia typically does not require frequent repotting when grown in the ground. If container-grown, repot every 2-3 years in spring into a slightly larger pot with fresh, well-draining potting mix to refresh the soil and prevent root-bound conditions.

FAQs

What are the ideal growing conditions for Agastache scrophulariifolia?

Agastache scrophulariifolia thrives in full sun and well-drained soil. It prefers average to dry conditions and is quite drought tolerant once established.

How tall does purple giant hyssop typically grow?

Purple giant hyssop usually reaches a height of 60 to 120 centimeters, with a similar spread.

When does Agastache scrophulariifolia bloom?

The flowering period for Agastache scrophulariifolia typically spans from mid-summer to early fall, producing spikes of lavender to purple flowers.

Is purple giant hyssop a good plant for attracting pollinators?

Yes, Agastache scrophulariifolia is highly attractive to bees, butterflies, and other beneficial insects due to its nectar-rich flowers.

Does purple giant hyssop require winter care?

It is beneficial to cut back Agastache scrophulariifolia stems to the ground in late fall or early spring to encourage new growth and maintain plant health.

Care Requirements

Sunlight Requirements

Full Sun

Thrives in at least 6 hours of direct sunlight daily.

Watering Needs

Moderate

Prefers consistently moist soil, but good drainage is essential.

Soil

Well-drained, average to fertile

Temperature Tolerance

Moderate

Hardy in USDA zones 4-8; prefers moderate temperatures, dislikes extreme heat and humidity.

Fertilizer Needs

Low

Benefits from a light feeding in spring; generally low fertilizer requirements.

Additional Care Tips

FAQs

What are the ideal growing conditions for Agastache scrophulariifolia?

Agastache scrophulariifolia thrives in full sun and well-drained soil. It prefers average to dry conditions and is quite drought tolerant once established.

How tall does purple giant hyssop typically grow?

Purple giant hyssop usually reaches a height of 60 to 120 centimeters, with a similar spread.

When does Agastache scrophulariifolia bloom?

The flowering period for Agastache scrophulariifolia typically spans from mid-summer to early fall, producing spikes of lavender to purple flowers.

Is purple giant hyssop a good plant for attracting pollinators?

Yes, Agastache scrophulariifolia is highly attractive to bees, butterflies, and other beneficial insects due to its nectar-rich flowers.

Does purple giant hyssop require winter care?

It is beneficial to cut back Agastache scrophulariifolia stems to the ground in late fall or early spring to encourage new growth and maintain plant health.

Purple Giant Hyssop (Agastache scrophulariifolia)

Care Requirements

Plant Overview

Image Gallery

Flowering & Fruiting Cycles

Additional Care Tips

Water

Pruning

Propagation

Repotting

FAQs

What are the ideal growing conditions for Agastache scrophulariifolia?

How tall does purple giant hyssop typically grow?

When does Agastache scrophulariifolia bloom?

Is purple giant hyssop a good plant for attracting pollinators?

Does purple giant hyssop require winter care?

Loading plant details

Purple Giant Hyssop (Agastache scrophulariifolia)

Care Requirements

Plant Overview

Image Gallery

Flowering & Fruiting Cycles

Additional Care Tips

Water

Pruning

Propagation

Repotting

FAQs

What are the ideal growing conditions for Agastache scrophulariifolia?

How tall does purple giant hyssop typically grow?

When does Agastache scrophulariifolia bloom?

Is purple giant hyssop a good plant for attracting pollinators?

Does purple giant hyssop require winter care?