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Impatiens parviflora

Identity

Common name: Small balsam
Origin: Central Asia
Plant type: Herbaceous
Life cycle: Annual
Code of conduct: Annex I (consensus list)
Invasive status (ISEIA protocol): Watch list
Main ornemental function: Mixed border

Description

Erect herb up to 30 -70 cm tall. Flowers pale yellow. Seeds contained in capsule up to 2 cm long. I. partiflora can be distinguish from the native I. noli-tangere by its smaller flowers.

Spread

I. parviflora only spread by seeds. One individual can produce up to 10 000 seeds, but the number is highly variable depending on the habitat type invaded and the population density. Seeds are expelled at a few meters from the plant by explosion of the capsule. Cultivated for ornament. Escaped from botanical gardens.

Habitat

I. parviflora can invade woods from distubed areas (clearcuts or along roadways) where seeds easily germinate. It prefers moist, nutrient-rich and shaded habitats

Impact

Species classified B3 in Belgium. Listed as an invasive species in France. Widespread in Belgium, where the species can form dense populations. Reduction of plant richness and outcompetition of the native congeneric I. noli-tangere were suggested in the literature but have not been demonstrated. Detailed impact on native vegetation is still poorly understood but seems to be rather The impact of I. parviflora is less documented than an other invasive balsam, the Himalayan balsam (Impatiens glandulifera). For more information, click here

Recommendation

Do not plant, do not buy this species.

Possible native alternative

Main ornemental function

Mixed border

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