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

Bottle Gentian is a Garden Darling!

Discover the beautiful Bottle Gentian flower, with its dark blue closed petals that never open. Found in North America, this perennial will bloom in late summer and thrive with minimal care. Pollinated exclusively by bumblebees, it can handle cold weather and become a unique addition to any garden!

Making a Difference, One Bird at a Time

I enjoy every bird as it is taken out of the bag. It feels a little bit like Christmas each time the bander, professionally takes a bird out for processing. We revel in the beauty of an American Redstart or the grand beak of a Northern Flicker.

Foamflower Shows Well in Groups

Welcome wildlife to your garden with Foamflower! A great addition, this plant has green lobed leaves that turn deep purple in falls and produces masses of lightly-scented white star-shaped flowers. Deer resistant, easy maintenance and care – perfect for summer gardens!

Ikebana Workshop – Notes from the Old Ottawa South Garden Club

from Old Ottawa South Garden Club Join the Old Ottawa South Garden Club for a workshop on Ikebana—a traditional Japanese art of flower arrangement by Elizabeth Armstrong, Second Associate Master in the Ohara School. Learn about its history and create your own arrangement with help from Elizabeth and Patty McGaughlin. Next meeting on April 9th to learn about easy-care, hardy perennials and lazier gardener methods.