Purple Giant Hyssop sets soft plumes of the palest purple flowers that top out at 6 feet, soaring above most other plants in the garden. The individual blossoms open over a period of several weeks in the fall.

From seed, it is easy to grow, but be mindful that the first blooms will typically appear in the second year. With the purple giant hyssop, the best practice is to start seeds indoors about 8 weeks before the latest frost date in your location. When you’re ready to transplant outdoors, find a spot that gets plenty of direct sunlight. Plant in dry, sandy, light, rocky soil and water moderately. Be mindful that it does not like to be in a crowded area; leave lots of room for it to grow without competition.

Quick Growing Guide

Botanical Name: Agastache scrophulariifolia

Also Called: Figwort Giant Hyssop

En français: Agastache à feuilles de scrofulaire

Colour:

Blooms:

Water: Medium-Wet, Medium, Medium-Dry

Hardiness Zones:

Pruning Giant Hyssop

Pruning is an essential step in developing your hyssop for a fresh bloom and a healthy plant. To revitalise a purple giant hyssop plant, cut the stems to as low as 2 inches (5 cm) from the ground. The pruning scissors or knife must be sterilised. This task is best done in early spring.

Pollinators

The long bloom time, combined with high nectar content, makes this plant highly attractive to bees and butterflies, including the endangered Rusty Patched Bumblebee.

Birds feed on the seeds that follow.

Comments

Leave a Reply

More From Gardening Calendar

Fireweed

Fireweed for pollinators: discover the wild magenta willow plant with stunning blooms & its importance for pollinators. Visit North Carolina to witness Fireweed and its unique beauty, or learn more about its edibility, and its potential toxicity to animals.

Flat-Topped Aster

The flat-topped aster attracts a range of pollinators, many bees, wasps, beetles, flies, and butterflies. We present a quick growing guide.

Top 10 North American Gardens Worth Traveling For

Explore the Top 10 North American Gardens Worth Traveling For on a unique armchair tour with the OOSGC! Discover the history and design of the Chicago Botanic Garden, Dr. Sun Yat-Sen Classical Chinese Garden, and Reford Gardens, or explore other noteworthy gardens from Las Ponzas to the Tucson Botanical Gardens.

Canadensis Native Tree Project

Discover how urban expansion and encroachment are endangering our native trees in Ottawa. Learn about a successful project to cultivate local trees and join the fight for our tree canopy!