Hypericum androsaemum is an erect perennial shrub to 1.5m. Slender reddish stems with opposite leaves, Flowers produced in spring-summer have five yellow petals with numerous stamens. Seeds are produced in pulpy, black capsules. Seed is spread by birds, foxes, machinery and in soil and garden refuse. Highly invasive in cool moist forest environments. Tolerates deep shade and open sunny environments with sufficient moisture.
Manual control
Seedlings can be hand pulled if all the roots can be removed. Use a trowel or knife to loosen the soil first.
From SGLN’s 2017 weed guide.
Herbicides must be applied at the appropriate rate as specified on the label and all safety precautions followed. If chemical control is necessary near drainage lines or streams, use extreme caution as the effects on aquatic life can be devastating even in minute amounts. Always seek expert advice.
Chemical control notes from SGLN’s 2017 weed guide
Cut and paint with Glysophate or Vigilant Gel. When to spray; spring when it is emerging and leaves are new. Foliar spray with Tordon 75D add Pulse penetrant. Always check the herbicide label before use. Keep in mind that there are restrictions on the use of herbicide in watercourses.
These notes are from 2017, and some information, particularly herbicide information, may be out of date. Please ask local suppliers and do your own research in selecting herbicides if choosing chemical control.
Family, origin, type, plant instead, control methods and the note above are from SGLN’s pocket guide Common weeds of South Gippsland (2026).
