NEWS: 7th May 2026
Garden centre plant mistaken for wild garlic prompts warning over invasive species risks
Homeowners should be vigilant about invasive garden plants commonly found in UK garden centres after a South Wales homeowner mistakenly believed a fast-spreading species was wild garlic. Though it can be used as a tasty addition to recipes – it is highly invasive and toxic to dogs if ingested.
The plant, Three-cornered garlic (Allium triquetrum) also known as Three-cornered leek, is widely available in UK garden centres for around £2.45 and is often confused with snowdrops and daffodils due to its similar appearance, though it has a distinctive garlic-like scent when in bloom.
However, it is listed under Schedule 9 of the Wildlife and Countryside Act 1981, meaning it is illegal to cause it to spread in the wild and is deemed as ‘controlled waste’. Homeowners are responsible for preventing its spread beyond their property and ensuring it is disposed of correctly. Failure to do so can result in fines of up to £5,000.
Misidentification of invasive plants remains common, as several species continue to be sold in garden centres without clear (or any) labelling. Getting it wrong can be costly if you unknowingly introduce an invasive plant into your garden. Invasive plants can quickly spread, taking over flower beds, and lawns, and out-competing native plants and flowers.
Jack Taylor, from South Wales, said he spent a year believing a patch in his garden was wild garlic.
The plant’s strong garlic scent also led to confusion within his family, with his father-in-law taking bulbs home and keeping them in a separate pot in his own garden – unaware the plant was invasive and could cause serious problems if it spread.
He only recently found out it was an invasive plant after they sought advice from Environment Controls, who confirmed the plant was not wild garlic but an invasive non-native species capable of spreading rapidly through underground bulbs.
Jack Taylor said: “We genuinely thought we had a garden full of wild garlic. It smelled so strong that when my father-in-law visited, he took some bulbs home to share with friends. We had no idea it was an invasive plant. It was a shock finding out there are rules about it and you can actually get fined if it spreads.”
While the plant is legal to purchase, it is classified as controlled waste. Disposing of it incorrectly in council green waste bins or fly-tipping can cause it to spread onto neighbouring properties.
Jennifer Holmes from Environment Controls has first-hand experience of this plant, and says: “Three-cornered garlic is commonly mistaken for wild garlic due to its intoxicating garlic aroma when flowering – especially in sunlight. However, this is a highly invasive plant and is toxic to dogs if ingested. It’s also very difficult to completely eradicate and any efforts to do so by homeowners come with the threat of it returning if any fragments are left behind, but also serious issues about how to dispose of the dug up plants. It arrived in the UK in 1759 but was first spotted in the wild in 1849 after it escaped from horticulture – since then it has become highly invasive. As a homeowner who has experienced Three-cornered garlic first hand I’m aware of the difficulty of completely eradicating this invasive plant – it really is one for our team of experts to deal with. If you do wish to enjoy its pretty flowers and garlic aroma my best advice is – keep it potted up on a patio so it doesn’t have a chance to grow through the pot into soil. As a caution to dog-owners this plant is toxic if your dog munches on it (typically it looks like grass) so if you do have it in your garden it’s best to get rid of it.”
How to identify Three-cornered garlic
This invasive plant is often mistaken for snowdrops or young daffodils, but here are it’s defining characteristics:
- Short to medium tufted plant.
- Floppy, triangular leaves.
- White flowers are bell shaped, 10 – 18mm long with a strong green stripe going down the middle of each petal.
- Flowers form in an umbrella format from each central stem.
The plant spreads via underground bulbs, meaning even small fragments left in soil can regrow once established.
Help is at hand
Professional removal is recommended, this typically involves herbicide treatment or excavation.
If you suspect you have Three-cornered garlic, use our free identification service for a rapid response from one of our invasive plants experts, or get in touch with the team below.