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Agastache nepetoides (Yellow giant hyssop)

Beginner
skill rating
1 hour care
per year
1.8m
Max height
0.9m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Agastache nepetoides

Other names

Yellow giant hyssop

Genus

Agastache Agastache

Species

A. nepetoides - A. nepetoides is a vigorous, upright, herbaceous perennial with stout, square stems bearing ovate, toothed, dark green leaves and terminal spikes of tiny, whorled, yellow-green flowers from midsummer to early autumn.


Agastache nepetoides is: Deciduous

Habit

Upright

Flower

Yellow-green in Summer; Yellow-green in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn

How to care

Watch out for

Leaf spot , Crown rot , Powdery mildew , Rust Leaf spot , Crown rot , Powdery mildew , Rust

General care

Pruning

Cut back the faded flower-stems in autumn or leave for winter interest and cut back in spring.

Propagation

Sow seed at 13-18C in spring.

Propagation methods

Semi-ripe cuttings, Seed, Division


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Where to grow

Agastache nepetoides (Yellow giant hyssop) will reach a height of 1.8m and a spread of 0.9m after 2-5 years.

Suggested uses

Woodland, Wildlife, Wildflower, Cottage/Informal, City, Beds and borders

Cultivation

Prefers partial or dapple shade, ideally along a woodland edge, in fertile, moist but well-drained soil. Dislikes dry areas in full sun. If in full sun, soil should stay consistently moist.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Well-drained, Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade

Aspect

South, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Agastache nepetoides

Other names

Yellow giant hyssop

Genus

Agastache Agastache

Species

A. nepetoides - A. nepetoides is a vigorous, upright, herbaceous perennial with stout, square stems bearing ovate, toothed, dark green leaves and terminal spikes of tiny, whorled, yellow-green flowers from midsummer to early autumn.

Foliage

Deciduous

Habit

Upright


Colour

Flower

Yellow-green in Summer; Yellow-green in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn


How to care

Watch out for

Specific diseases

Leaf spot , Crown rot , Powdery mildew , Rust

General care

Pruning

Cut back the faded flower-stems in autumn or leave for winter interest and cut back in spring.

Propagation

Sow seed at 13-18C in spring.

Propagation methods

Semi-ripe cuttings, Seed, Division


Monthly care advice


Where to grow

Agastache nepetoides (Yellow giant hyssop) will reach a height of 1.8m and a spread of 0.9m after 2-5 years.

Suggested uses

Woodland, Wildlife, Wildflower, Cottage/Informal, City, Beds and borders

Cultivation

Prefers partial or dapple shade, ideally along a woodland edge, in fertile, moist but well-drained soil. Dislikes dry areas in full sun. If in full sun, soil should stay consistently moist.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Well-drained, Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade

Aspect

South, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 10, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3, Zone 2

Defra's Risk register #1

Plant name

Agastache nepetoides (Yellow giant hyssop)

Common pest name

tomato thrips

Scientific pest name

Ceratothripoides brunneus

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Thrips present in Africa; the Caribbean and parts of Asia; frequently intercepted in the UK. Can cause significant damage to tomatoes and other crops in countries where it is present. Europe wide PRA will consider its potential to establish and cause damage.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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This plant likes... Garden match
Soil types: Chalky, Loamy, Sandy Tell us...
Soil drainage: Well-drained, Moist but well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade Tell us...
Aspect: South, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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