Family: Urticaceae
Origin, Description & Uses:
Laportea aestuans, commonly known as West Indian nettle, is a fast-growing, herbaceous plant native to tropical regions of the Americas and now found throughout many warm regions of the world, including parts of Hawaiʻi. It grows upright, typically reaching a few feet tall, with soft green leaves and stems covered in fine stinging hairs that can cause a sharp, irritating rash upon contact. The plant produces small, inconspicuous flowers followed by numerous tiny seeds that are easily spread by wind, water, or human activity. West Indian nettle is most often found in disturbed areas such as roadsides, gardens, and agricultural lands. It is not commonly cultivated due to its irritating properties, though some related species have been used traditionally for fiber or medicinal purposes.
Risks & Threats:
West Indian nettle is naturalized on Hawaiʻi Island and is potentially naturalizing on Kauaʻi and Oʻahu, indicating its ability to spread and establish in new areas. It possesses several traits that are cause for concern, including rapid growth, prolific seed production, and a strong ability to colonize disturbed environments. These characteristics allow it to compete with and potentially displace native vegetation, contributing to the degradation of sensitive tropical island ecosystems. Its stinging hairs can also discourage access for land management and recreation. Because of these risks, Laportea aestuans could detrimentally impact Hawaiʻi’s ecosystems if left unmanaged. It is recommended to avoid planting or spreading this species and instead choose low-risk or native alternatives that help protect and support local biodiversity.
High Risk Traits:
- Native to tropics
- Naturalized in Florida; Hawaiʻi (naturalized), Kauaʻi & Oʻahu (potentially naturalizing)
- Major agricultural weed (banana orchards)
- Shade tolerant
- Tolerates wide soil pH range
- Annual (short generation time)
- Dispersed unintentionally (trafficked areas) and by water
- Prolific seed production (>1000/m²)
- Host for nematodes and aphids
Low Risk Traits:
- Not an environmental weed
- Narrow climate versatility
- No spines, burrs, or toxicity
- No bird, external animal, or intentional dispersal
