Species Purple Giant Hyssop
purple-blue flowers with green sepals and foliage

Purple Giant Hyssop

Agastache scrophulariifolia

Purple Giant Hyssop (Agastache scrophulariifolia) is a popular garden plant that boasts an attractive combination of height and color. Growing as tall as five feet, this hardy annual does well in full sun to partial shade. It produces long lasting spikes of light purple, fragrant flowers from mid-summer to early fall, and is a favorite of butterflies, hummingbirds, and bees. Its deep green leaves, serve as an attractive backdrop, making it a great addition to flower beds or borders. It's also an easy plant to care for, requiring little maintenance and able to tolerate extreme weather conditions. With its beauty and versatility, Purple Giant Hyssop is a winning choice for any garden.

Watering:

Average

Propagation:

Division,Cutting,Seed Propagation,Layering Propagation

Hardiness Zone:

5

Flowers:

Purple Flowers

Sun:

Sun, Partial Shade

Soil:

Clay, Sand, Loam

Leaf:

Yes

Leaf Color:

green

Growth Rate:

Low

Drought Tolerant:

Yes

Care Level:

Medium

watering

Purple Giant Hyssop should be watered thoroughly once or twice per week depending on temperature and soil moisture. If the temperature rises, the plant should be watered more often. If the temperature stays low, then once per week should be sufficient. Soil should be allowed to dry out between watering sessions. If the soil is consistently wet, it can lead to root rot. During the summer months, it is a good idea to mulch the soil around the plant to help with water retention.

sunlight

Purple Giant Hyssop (Agastache scrophulariifolia) is a sun-loving plant that thrives in full sun. It prefers at least 6-8 hours of direct sunlight per day and should be planted in a location that receives direct sun for most of the day. During the hottest part of the day, the plant may benefit from some protection from the sun's rays, such as a partial shade cloth or tree branches. In the winter months, Purple Giant Hyssop can withstand some full shade, but it should receive at least 4-6 hours of direct sunlight.

pruning

Purple Giant Hyssop (Agastache scrophulariifolia) should be pruned back in early to mid spring once new growth has started. Prune back any dead or straggly stems and any flower spikes that have already bloomed. This will help to create a bushy and healthy plant with more compact growth and encourage more flowers. Flip the plant over and snip off any dead stems from the bottom of the plant as well. For best results, do not prune more than 1-third of the plant at any 1 time.

Season

Fall
Winter
Spring
Summer
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Starts Flowering

Agastache scrophulariifolia typically starts flowering in late spring or early summer, usually in May or June.

Starts Flowering

Agastache scrophulariifolia typically starts flowering in late spring or early summer, usually in May or June.

Hardiness Map