Invasive wild garlic dominating riverside flora

Water of Leith is overcome with the three cornered leek (Allium triquetrum) a kind of wild garlic. In the last five years it has come to dominate the riverbanks in April and May. Though pretty it is highly invasive and very difficult to eradicate. It was brought over to the UK from the Mediterranean, and it is an offence under Schedule 9 of the Wildlife and Countryside Act in England and Wales to plant or otherwise cause to grow this species in the wild. It is not clear what the rules are in Scotland.

It can be used for cooking but there have been cases of poisoning caused by over consumption by some mammals and dogs may be sensitive.

The Royal Horticultural Society’s answer to how to eradicate it from your garden is thus

“The three-cornered leek, Allium triquetrum, is rather a stubborn garden inhabitant once it takes up residence. The non-chemical method if the problem is just in a small area would literally be to dig up everything, including your garden plants, and start over. You would need to replace the soil to a spade's depth. This, of course, is not ideal, so you could try the chemical control approach. First, bruise the leaves with a gloves hand to make it easier for the chemical to be absorbed, and very carefully spray a glyphosate-based weedkiller such as Roundup or Tumbleweed just to the offending garlic. There is a also a Roundup 'spot' gel which may be easier to apply.”

It would be valuable to know what CEC Natural Heritage policy is to its eradication along the riverbanks.