Lifted a garden pot and found this flat, dark purple blob. It looks like a slimy piece of liver with a pale border and is totally smooth. It’s frighteningly ugly. What is this thing?

If you discover a New Zealand flatworm in your garden, it’s important to act quickly to prevent them from spreading. Carefully capture the flatworm using a pair of gloves or a tool, taking care not to let it escape back into the soil. Place it in a sealed container for further inspection or disposal.
Document the sighting by taking photographs and noting the location and conditions of the discovery. This information can be useful for tracking their spread and informing local environmental authorities or garden clubs, who may be monitoring flatworm populations.
8. Humane (And Effective) Ways To Kill Or Contain Flatworms
While it may be necessary to eliminate New Zealand flatworms to protect your garden, it’s important to do so humanely. One effective method is to place them in a container and freeze them, which is considered a humane way to euthanize them. Alternatively, you can contact local pest control experts for guidance on appropriate methods.
Containing flatworms involves reducing their preferred habitats by lifting pots and stones regularly and maintaining dry conditions whenever possible. By making the environment less hospitable, you can discourage their presence in your garden.
9. Protecting Your Garden: Prevention Tips And Pot-Lifting Checks
To prevent New Zealand flatworms from establishing in your garden, regularly inspect under pots and other garden items for signs of their presence. Consider using elevating stands for pots to reduce the cool, dark environments they prefer.
Maintaining a well-drained garden with minimal debris can also help deter flatworms. Additionally, introducing predatory insects that naturally control flatworm populations can be an ecological solution to preventing infestations.
10. How Widespread Is The Problem In Your Area?
The invasive land flatworm Arthurdendyus triangulatus has repeated sequences in the mitogenome, extra-long cox2 gene and paralogous nuclear rRNA clusters | Scientific Reports
The distribution of New Zealand flatworms varies widely, with some regions experiencing more significant problems than others. In the UK and parts of Europe, they have become a notable invasive species, particularly in areas with mild, moist climates.
Checking with local gardening clubs, environmental agencies, or online forums can provide insight into how widespread the issue is in your area. Staying informed about regional infestations can help you take proactive measures to protect your garden.
11. When To Report Sightings And Where To Get Expert Help
Reporting sightings of New Zealand flatworms can be crucial for managing their spread and understanding their impact on local ecosystems. If you discover one, contact your local environmental or agricultural authority to report the sighting.
Many regions have dedicated hotlines or online portals for reporting invasive species. Additionally, reaching out to local gardening clubs or university extension programs can connect you with experts who can provide advice and support in managing flatworm populations in your garden.

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