Fallopia japonica, common name Japanese knotweed, is a tall, glorious, herbaceous perennial native to Eastern Asia. Here in North America it is very successful growing anywhere there is the least bit of water. It has been classified as an invasive species, and hated by many since it is very hard to remove once it becomes established. It has naturalized here and the question remains, when is it considered non-invasive?
I have to say I love Japanese Knotweed. We have lots of it on our property and it is well managed. We mow and pull it out manually. It is a abundant source of pollen in the late summer for bees, flies and small butterflies when other plants are starting to go to seed. Right now our yard is “buzzing”. Its an amazing sight and sound. One of my favorite parts of the summer.
This plant is incredible. It grows so fast you can hear it. Yes you read that correct. In the spring it pushed up the dead leaves on the ground as it grows and you can hear the shoots moving the leaves aside. One spring I am going to measure the growth daily. I’m guessing 2-3 inches in 48 hours. It grows fast. And its good eating. I prefer it over asparagus. The shoots have a lemony taste.
The leaves are broad and create shade and privacy. Managed right it will create a jungle in your yard that supplies wildlife such as birds, rabbits and mice with a place to forge, hide from predators such as fox and house cats.
And don’t forget the insects. Paper wasps such as Polisties use it for nest making, scraping the fibers off the old canes to make a paste for their nests. Then in the late summer early fall the thick crown of flowers provides pollen for many insects, mostly honey bees. The biodiversity in my yard is 10 fold because of these plants. I love them.