What does it look like?
Agapanthus grows as clumps of arching, strap-like green leaves with a watery sap. It has thick, long, white rhizomes (roots), and produces purplish-blue or white flowers on top of tall stalks during summer. The seeds are held within a 3-sided capsule that is about 5cm long.
Agapanthus flourishes in coastal, frost-free (or lightly frosted), temperate climates and is commonly cultivated in public and private gardens. It grows wild in urban areas, on roadsides, coastal cliffs, stream edges and forest margins.
Why is it a problem?
Agapanthus tolerates a wide range of soil types and growing conditions, forming dense monocultures that exclude native plants and modify plant communities.
Strong, fleshy roots spread underground to create large clumps and it can also re-grow from root fragments. Plants mature quickly, producing large numbers of seeds (up to 4,000 per flower head) that germinate readily.
Removal of the bulb-like base of the plant by hand is effective. A trowel or spade may be required for deeper bulbs or larger infestations.
- Cut and stump treat with Vigilant® gel
Two or three repeat applications will be necessary at 6-8 week intervals for effective control.