Is it safe to plant in my garden?

It is highly invasive and often illegal to plant in many areas, so check local regulations first.

Pull the plants before they set seed in late summer.

Plant guide

Himalayan balsam.

Impatiens glandulifera

Pronounced im-PAY-shenz glan-doo-LIF-er-uh

Also known as Himalayan balsam, Indian Balsam

Himalayan balsam — Photo by Kieran Roy Powell (CC BY) via iNaturalist

This is a tall, fast growing annual plant that produces beautiful orchid like flowers. It is well known for its explosive seed pods that scatter seeds over long distances. Please be aware that it is considered an invasive species in many parts of the world.

Another photo of Himalayan balsam — Photo by Alice Shanks (CC BY) via gbif

At a glance

Care level: Easy
Plant type: Annual
Light: Partial shade to full sun
Indoor light: Bright indirect
Water: Every 2 to 4 days
Mature size: 2 to 3 meters
Growth rate: Fast
Hardiness: USDA 7 to 10
Bloom time: Mid summer to early autumn

Care

Keep the soil consistently moist as this plant loves water. Watch for wilting during dry spells, which is a clear sign it needs a drink. Since it spreads aggressively, you should remove the seed heads before they burst to keep it contained.

Watering: Keep the soil damp at all times but avoid letting it sit in standing water.
Feeding: Apply a balanced liquid fertilizer once a month during the active growing season.
Pruning: Deadhead flowers regularly to prevent the plant from self seeding in your garden.
Repotting: As an annual, you typically do not need to repot this plant, but you can start fresh seeds each spring.
Soil: Moist, fertile, well draining soil
Soil pH: 6.0 to 7.5
Temperature: 5 to 30°C
Humidity: 60 to 90%
Drought tolerance: Low
Lifespan: Annual, completes its life cycle in one year.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Soil drying out too quickly.

Safety

People: The plant is generally considered non-toxic, but ingestion is not recommended.
Pets: This plant is generally considered non toxic to cats and dogs.
Children: The explosive seed pods can startle children, but they pose no significant physical danger.
Contact allergens: Handling the stems may cause mild skin irritation in sensitive individuals.
Airborne allergens: Pollen can be an irritant for those with severe hay fever.
Edibility: This plant is not considered edible and should be avoided.

How to identify it

Tall hollow reddish stems
Lance shaped serrated leaves
Pink to purple orchid like flowers
Explosive seed pods when ripe

Height: 1 to 3m
Spread: 0.6 to 1m
Leaves: green, bronze, deciduous
Flowers: pink, purple, white, 3 to 5cm
Fruit: green, brown, Autumn

Problems to watch for

Powdery MildewCommon
RustCommon
AphidsUncommon
Slugs and SnailsUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: seed
When to plant: Spring
Overwintering: The plant dies back completely after the first frost, leaving only seeds in the soil to germinate the following spring.
In containers: It grows well in large pots, but its rapid growth requires frequent watering.

Seed

Collect seeds from mature pods in late summer.
Sow seeds directly into moist soil in early spring.
Keep the soil consistently damp until germination.

Because this plant is so aggressive, it is best grown in a contained area or avoided entirely to protect native flora.

Grows well with

Ferns · They share similar requirements for shade and moisture.
Hostas · They provide a nice foliage contrast in damp garden spots.

Similar species

Busy Lizzie · A smaller, less invasive relative often used in containers.

Science

Family: Balsaminaceae
Genus: Impatiens
Order: Ericales
Class: Magnoliopsida
Native range: Western Himalayas
Conservation: This plant is considered highly invasive in many regions and should not be planted in the wild.

It thrives in damp, shaded environments and spreads rapidly along riverbanks.

Value to wildlife: nectar source
Pollinators: bees, butterflies, moths
Uses: ornamental, pollinator garden

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 5/9
Light: 5/9
Temperature: 5/9
Moisture: 8/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Is it safe to plant in my garden?: It is highly invasive and often illegal to plant in many areas, so check local regulations first.
How do I control it?: Pull the plants before they set seed in late summer.

Where the name comes from

The name Impatiens refers to the impatient nature of the seed pods which burst at the slightest touch, while glandulifera describes the glands on the leaves.

Good to know

It is commonly known as Himalayan Balsam.
It can grow up to 3 meters in a single season.
The plant was introduced to the UK as an ornamental in the 1800s.
It is one of the tallest annual plants in the world.

Keep your himalayan balsam growing

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.