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

Orchids at the Vallarta Botanical Garden

Stop at this month's fascinating Myrmecophila galeottiana orchid to learn about its unique relationship with ants, then explore Vallarta Botanical Garden's great diversity of other orchids!

How To Grow and Care For Bougainvillea

Learn more about caring and protecting your Bougainvillea plants + originated from South American Brazil. Give your Bougainvillea the perfect care from soil to light and the best pest control.

Types of Garden Shrubs

Types of shrubs, there are two. Evergreen shrubs have year-round leaves. Deciduous bushes lose their leaves in the winter. We present ideas.

Winterberry Growth and Care

Winterberry holly leaves fall off in late fall and early winter, leaving a stunning display of brilliant red fruit in your garden. Read more.