Aye, this is the problem with a lot of invasive edibles. Too few people are interested in foraging and usually you can only eat so much foraged stuff.

If everyone went out with tubs, bags and baskets on their days off and did a bit of foraging to make their diets a bit more varied and healthy then we might be able to make a dent in things like Himalayan Balsam and American Signal Crayfish. Realistically though we’d just have to limit foraging of easier to identify and prepare plants and fungi from easier to access areas.