@Spirit of place , the thread had closed before I could answer your question about Japanese knotweed! I first became aware of it in 2019, due to an article I read in Slate, the writer (who lives in Brooklyn, NY) of the article was having a battle with it in their yard! I attended a workshop at The Brooklyn Botanic Garden that summer and it was a major discussion point. Frederick Law Olmsted's landscape firm was not only contracted to do Central Park, but also Prospect Park in Brooklyn, NY. And the success he gained from these projects led him to all sorts of states in the US, where he designed all sorts of municipal gardens, as well as many private gardens of some of the wealthiest families of that time period. In the late 1800's Japanese knotweed was considered quite the specimen plant, and was sold in seed catalogs and plant nurseries.....it originally was cultivated in The Netherlands, so we can thank them for that! It is considered an environmental threat in 42 of our 50 states - it either doesn't seem to grow in the arid Southwest or in a couple of gulf coast states or it was never introduced there.
I haven't read that it has been as destructive as people in England are finding it...probably because we are learning from their successes and mistakes in handling the issue. I have read that in Hudson, NY, along the Hudson River, it has become such a threat, that native species of plants are being wiped out and with that, native wildlife is being wiped out along with it. Not long ago, I read that they were using some sort of system that England has had some success with, something to do with grids that choke out the plants new growth. There have been a couple of lawsuits, as the article in Slate talks about, but nothing like what is happening in England, with people not being to get mortgages or insurance.
Last year, I read an article about how some well-known forager was leading expeditions in Central Park, promoting its use as a food source. Apparently, it tastes like rhubarb! Maybe Stephanie can get Maria to serve it to some of her guests?
The invasive plant that crossed an ocean to terrorize my backyard is coming for yours.
slate.com
New Yorkers rediscover nature around them amid rising concerns of food security, sustainability
nycitylens.com