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Isatis tinctoria (Woad)

Beginner
skill rating
1 hour care
per year
1.2m
Max height
0.45m
Max spread
1-2 years
To maturity

Plant details

Botanical name

Isatis tinctoria

Other names

Woad, Ash of Jerusalem, Dyer's weed, Dyer's woad, Jerusalem ash

Genus

Isatis Isatis

Species

I. tinctoria - I. tinctoria is an upright, tap-rooted, hairless or slightly hairy, short-lived perennial or biennial with oblong to lance-shaped, grey-green leaves and, in early summer, branched panicles of four-petalled, lightly fragrant, yellow flowers.


Isatis tinctoria is: Deciduous

Habit

Erect flower stem, Upright

Flower

Yellow in Summer

Foliage

Grey-green in Spring; Grey-green in Summer; Grey-green in Autumn

How to care

Watch out for

General care

Propagation

Site carefully as it will self-seed readily in favourable conditions.

Propagation methods

Seed


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Where to grow

Isatis tinctoria (Woad) will reach a height of 1.2m and a spread of 0.45m after 1-2 years.

Suggested uses

Beds and borders, Cottage/Informal, Wildflower, Wildlife

Cultivation

Grow in moderately fertile, moist but well-drained, preferably aneutral to alkaline soil in full sun. Will tolerate partial shade. I. tinctoria depletes the soil of nutrients so will not thrive if grown in the same position for more than two years.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East, 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

Isatis tinctoria

Other names

Woad, Ash of Jerusalem, Dyer's weed, Dyer's woad, Jerusalem ash

Genus

Isatis Isatis

Species

I. tinctoria - I. tinctoria is an upright, tap-rooted, hairless or slightly hairy, short-lived perennial or biennial with oblong to lance-shaped, grey-green leaves and, in early summer, branched panicles of four-petalled, lightly fragrant, yellow flowers.

Foliage

Deciduous

Habit

Erect flower stem, Upright


Colour

Flower

Yellow in Summer

Foliage

Grey-green in Spring; Grey-green in Summer; Grey-green in Autumn

General care

Propagation

Site carefully as it will self-seed readily in favourable conditions.

Propagation methods

Seed


Monthly care advice


Where to grow

Isatis tinctoria (Woad) will reach a height of 1.2m and a spread of 0.45m after 1-2 years.

Suggested uses

Beds and borders, Cottage/Informal, Wildflower, Wildlife

Cultivation

Grow in moderately fertile, moist but well-drained, preferably aneutral to alkaline soil in full sun. Will tolerate partial shade. I. tinctoria depletes the soil of nutrients so will not thrive if grown in the same position for more than two years.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East, West

Exposure

Exposed, Sheltered

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

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6

Defra's Risk register #1

Plant name

Isatis tinctoria (Woad)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci non-European populations

Type

Insect

Current status in UK

Absent

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

2

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

5

General biosecurity comments

Non-European populations of Bemisia tabaci pose an additional risk to European populations due to the potential for introducing non-European viruses.

Defra's Risk register #2

Plant name

Isatis tinctoria (Woad)

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci European populations

Type

Insect

Current status in UK

Absent

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

2

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

4

General biosecurity comments

The UK has a protected zone in place for this pest which helps to mitigate the risk of entry and establishment. An EFSA opinion is currently being discussed at the EU Annexes Working Group which recommends further strengthening of the regulation.

Defra's Risk register #3

Plant name

Isatis tinctoria (Woad)

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.

Type

Nematode

Current status in UK

Absent

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

2

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

4

General biosecurity comments

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

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, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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