Photo of Agastache scrophulariifolia

Agastache scrophulariifolia

Purple Giant Hyssop

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Purple Giant Hyssop is a tall, late-summer blooming perennial. Purple flowers are attractive to bees, butterflies and hummingbirds.

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Purple Giant Hyssop is a tall, late-summer blooming flowering perennial. It has clusters of small flowers on terminal spikes that vary in color from purple, to pale pink, to white. Small lobed flowers bloom in turn on each terminal spike, extending bloom time throughout the summer. A member of the mint family, Purple Giant Hyssop has square stems and fragrant leaves, offering some deer resistance. Grows best in moist soil or wet conditions, in rich or sandy soils, in dapled shade, thickets and meadows. Does not tolerate hot dry conditions. It’s 6 foot height makes it a good choice for a back border. Seeds readily propagate and plugs easily transplant.

Wildlife Value: Excellent nectar source for bees, butterflies and other pollinators. Birds forage on the seeds. 

Plant Details:

Plant Type: Flower, Perennial

New Jersey Native: Yes

Bloom Times: Late Summer to Fall

Bloom Colors: Pink, Purple, White

Deer Resistance: Some

Attracts Pollinators and Wildlife: Bees and Other Pollinators, Butterflies, Hummingbirds, Birds

Salt Tolerance: Unknown

Hardiness Zone: 6a, 6b, 7a, 7b

Physiographic Region: All Regions in NJ

Soil Characteristics

Soil Type: Loam, Organic, Sandy

Soil Moisture: Moist, Wet

Soil pH: Slightly Acidic, Neutral

Light Needs of Plant

Optimal Light: Partial Shade

Light Range: Full Sun, Partial Shade, Shade

Water Needs of Plant

Soil Moisture: Moist, Wet

Drought Tolerance: Low

Size and Growth Rate

Height: 3 ft - 6 ft ft

Spread: 2 ft - 3 ft ft

Growth Rate: Medium-fast