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Impatiens glandulifera (Himalayan balsam )

Beginner
skill rating
5 hours care
per year
2m
Max height
1m
Max spread
1 year
To maturity
Low
Toxicity

Plant details

Botanical name

Impatiens glandulifera

Other names

Himalayan balsam , Indian balsam, Jumping jack, Policeman's helmet, Jewelweed, Impatiens roylei

Genus

Impatiens Impatiens

Species

I. glandulifera - I. glandulifera is a tall, vigorous annual with red-flushed stems bearing whorls of ovate to lance-shaped, toothed, mid- to bright green leaves and racemes of fragrant, nodding, hooded, purple, rose-pink, rarely white flowers from summer into autumn.


Impatiens glandulifera is: Deciduous

Habit

Upright

Toxicity

Regular consumption of large quantities of any part of this plant is toxic. A major weed problem.

Flower

Purple, White, Rose-pink in Summer; White, Purple, Rose-pink in Autumn

Foliage

Green in Spring; Green in Summer; Green in Autumn

How to care

Watch out for

Specific pests

Glasshouse red spider mite , Vine weevil , Aphids Glasshouse red spider mite , Vine weevil , Aphids

Downy mildew Downy mildew

General care

Pruning

A major weed problem. Deadhead before seeds develop. Remove annual at the end of the growing season. Restrict spread.

Propagation

Seeds require a period of cold stratification. Sow in a greenhouse in spring. Self-seeds readily in areas where the minimum temperature in no lower than 15C.

Propagation methods

Seed


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Where to grow

Impatiens glandulifera (Himalayan balsam ) will reach a height of 2m and a spread of 1m after 1 year.

Suggested uses

Cottage/Informal, City, Beds and borders, Woodland

Cultivation

Plant in a sheltered, partially shaded or sunny spot in any moist but well-drained soil. Easily tolerates heavy clay soil. Self-seeds readily. Spreads rapidly by exploding seed capsules and is considered a noxious weed in many countries.

Soil type

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

Soil drainage

Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, 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

Impatiens glandulifera

Other names

Himalayan balsam , Indian balsam, Jumping jack, Policeman's helmet, Jewelweed, Impatiens roylei

Genus

Impatiens Impatiens

Species

I. glandulifera - I. glandulifera is a tall, vigorous annual with red-flushed stems bearing whorls of ovate to lance-shaped, toothed, mid- to bright green leaves and racemes of fragrant, nodding, hooded, purple, rose-pink, rarely white flowers from summer into autumn.

Foliage

Deciduous

Habit

Upright

Toxicity

Regular consumption of large quantities of any part of this plant is toxic. A major weed problem.


Colour

Flower

Purple, White, Rose-pink in Summer; White, Purple, Rose-pink in Autumn

Foliage

Green in Spring; Green in Summer; Green in Autumn


How to care

Watch out for

Specific pests

Glasshouse red spider mite , Vine weevil , Aphids

Specific diseases

Downy mildew

General care

Pruning

A major weed problem. Deadhead before seeds develop. Remove annual at the end of the growing season. Restrict spread.

Propagation

Seeds require a period of cold stratification. Sow in a greenhouse in spring. Self-seeds readily in areas where the minimum temperature in no lower than 15C.

Propagation methods

Seed


Monthly care advice


Where to grow

Impatiens glandulifera (Himalayan balsam ) will reach a height of 2m and a spread of 1m after 1 year.

Suggested uses

Cottage/Informal, City, Beds and borders, Woodland

Cultivation

Plant in a sheltered, partially shaded or sunny spot in any moist but well-drained soil. Easily tolerates heavy clay soil. Self-seeds readily. Spreads rapidly by exploding seed capsules and is considered a noxious weed in many countries.

Soil type

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

Soil drainage

Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, 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 10, Zone 9, Zone 8, Zone 7, Zone 6

Defra's Risk register #1

Plant name

Impatiens glandulifera (Himalayan balsam )

Common pest name

Necrotic spot

Scientific pest name

Impatiens necrotic spot virus

Type

Virus or Viroid

Current status in UK

Present (Widespread)

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

2

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

3

General biosecurity comments

Pest of mainly ornamentals and vegetables; present in the UK; and covered by the EU listing of Tomato Spotted Wilt Virus. To be kept under consideration in light of a review of the EU listing.

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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Impatiens glandulifera (Himalayan balsam )

Impatiens glandulifera (Himalayan balsam )

www.shootgardening.co.uk/plant/impatiens-glandulifera

Impatiens glandulifera (Himalayan balsam )

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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 Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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