Pseudacorus can definitely be invasive in some settings, because it seeds readily and the seeds can float downstream. And the plants will certainly spread enthusiastically if they're happy. On the upside, masses are grown in industrial wastewater ponds to strip out nutrients, a task for which water hyacinth is also used if the climate is warm enough.
In the setting of a backyard pond, I used to have a lot of marginals and found them all to be invasive on that scale (sweet flag, iris, pickerel weed, horsetail, every size and form of cattail, etc.). Now my vertical features are pitcher plants - beautiful, winter hardy, noninvasive, and they eat a few bugs.
Bob
On Tuesday, May 11, 2021, 11:41:24 AM EDT, Jack & Val Myrick via pbs <pbs@lists.pacificbulbsociety.net> wrote:
Isn’t Iris pseudacorus considered an invasive on the USA West Coast? It pops up here and there in the stream running through our town.
It is also growing in the pond on the property where our co-op garden is located. Somehow, it shows up in our vegetable beds. I mistakenly let
it grow in our pollinator bed where it became a big, happy, clump which I am now trying to kill. I used to admire it.
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