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Agapanthus is an introduced species that whilst beautiful has run rampant in NZ. It is one of the most difficult to kill plants due to its waxy leaves and dense underground rhizomes system (aka roots).
Identify the problem Agapanthus (Agapanthus praecox) is a weed when it spreads into the wild from gardens. It was introduced because of its attractive clumps of long leathery green leaves and purple, blue or white stalked flowers. It is easy to grow and hardy, but this also makes it weedy in the wild.
Agapanthus forms dense clumps with rhizomatous roots that make it difficult to eradicate. It is a prolific seed producer and spreads easily.
How to solve the problem As mentioned above, agapanthuses are incredibly tough to kill due to their dense rhizome/root system that is difficult to dig out and stop resprouting. In addition, they have waxy, shiny leaves that tend to make products like herbicides/weed killers slide off before they have a chance to work. While it might take time, it is still possible to get rid of agapanthus successfully.
Option 1 - Spray with Weed Weapon Rapid Action Ready to Use spray or Weed Weapon Extra Strength Concentrate mixed with Dye & Stick).Ensure all parts of each plant are treated and that all plants in the colony are treated. We recommend treating four times over the spring/early summer period to successfully kill off the colony.Be sure to use Weed Weapon Extra Strength Concentrate. Do not mix the ready to use spray with dye and stick as it dilute the pre-mixed spray making it less effective.
Option 2 - Cut down the agapanthus plants and immediately paint the stump with a thick layer of Weed Weapon Invade Gel. We recommend trimming back and re-treating the stump four times over the spring period to ensure the product is absorbed into all the rhizomes/roots.
Option 3 - Dig out plants and dispose of all root fragments at a transfer station. Be sure to remove every last rhizome/root structure to prevent them regrowing.
Read our Simple 1-2-3 Step Guide to Successful Agapanthus Removal for more tips and advice
Did you know? 
Helpful tips Weed Weapon Extra Strength and Weed Weapon Rapid Action work best when applied in warm sunny conditions when rain is not expected within 2 hours.
Read our Simple 1-2-3 Step Guide to Successful Agapanthus Removal for more tips and advice
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