Please make sure JavaScript is enabled.

Before You Leave…

Download the GardenTags App today and join 100,000+ gardeners getting FREE plant identification, garden management and more!

no thanks

 
Blue Giant Hyssop in the GardenTags plant encyclopedia

Agastache foeniculum syn. Agastache anethiodora ; Agastache anisata

 

Blue Giant Hyssop

An easy to grow clump forming plant with scented leaves and tall long flowering spikes of lilac blue flowers. In particularly hard winters they might have to be replaced the following year. Plant out after the last frost in the spring.

 
plant Features
  • Blue Giant Hyssop likes full sun

    Full sun

  • Blue Giant Hyssop likes very little water

    Very little water

  • Blue Giant Hyssop is a little frost hardy: 32f (0°c)

    A little frost hardy: 32F (0°C)

  • Blue Giant Hyssop likes moist and free draining

    Moist and free draining

 
plant information

Common name

Blue Giant Hyssop

Latin name

Agastache foeniculum syn. Agastache anethiodora ; Agastache anisata

type

Herb

family

Lamiaceae

ph

5.0 - 8.5 Acid - Neutral

  • Light

    Blue Giant Hyssop likes full sun

    Full sun

  • Frost

    Blue Giant Hyssop is a little frost hardy: 32f (0°c)

    A little frost hardy: 32F (0°C)

  • Soil

    Blue Giant Hyssop likes moist and free draining

    Moist and free draining

  • Water

    Blue Giant Hyssop likes very little water

    Very little water

Plant & bloom calendar

  •  
    Best time to plant
  •  
    When the plant will bloom

full grown dimensions

The size of a fully grown Blue Giant Hyssop is 0.50meters x 1.50meters 0.50 M 1.50 M

Agastache foeniculum syn. Agastache anethiodora ; Agastache anisata

An easy to grow clump forming plant with scented leaves and tall long flowering spikes of lilac blue flowers. In particularly hard winters they might have to be replaced the following year. Plant out after the last frost in the spring.


Flowering Season

From Early Summer TO Early Autumn

Upright spikes of small violet/blue flowers in summer and early autumn.

 

Planting Outdoors

From Early Spring TO Mid Spring

In spring plant container grown plants out in a well drained, sunny site after compost has been dug in.

 

Propagation by cutting

From Late Summer TO Mid Autumn

Semi hard wood cuttings are taken from the current years growth from late summer to mid autumn the bottom of the cuttings is hard and soft on the top. With a sharp knife take a cutting of about 14cms, remove lowest leaves, dip end into rooting hormone, and place round the edge of a pot filled with a suitable compost, water well, they must remain moist till rooted, place under glass but in semi shade.

 

Propagation by seed

From Early Spring TO Mid Spring

Sow seed under glass in spring.

 
Subscribe to GardenTags Premium to get personalised planting tasks and more for your entire plant collection
 
Gardeners who are growing this plant