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Longleaf Willow Primrose
Botanical name: Ludwigia longifolia
Noxious Weed Category: Class 3
Special note: Please contact Council to report a sighting.
Photo: Paul Marynissen
Dispersal
Seed explosion from capsule into water and spread by birds.
Control
Manual:
- First carefully remove any seed heads and bag them securely in plastic bags.
- Best incinerated, avoid further seed spread.
- Care should be taken not to inadvertantly spread seed attached to clothing.
- Seedlings can be hand pulled, but larger plants will re-shoot unless the majority of the many long embedded roots is removed.
- Discarded plants left lying on soil may take root.
- Always follow up the control of Ludwigia longifolia by rechecking the plant for any regrowth and the area for any new seedlings.
See Manual Weed Control Techniques.
Chemical: Please contact your local control authority for advice on chemical control.
Similar species
Ludwigia peruviana which has similar flowers and seed capsules to Ludwigia longifolia, is already a serious aquatic noxious weed in Sydney North. Ludwigia peruviana has lanceolate and finely haired leaves.