How Can I Eliminate An Invasive Plant From A Steep Hillside? I Believe It’s Hyperium Calcynium.

Question

It has tubers that form 1- 1 1/2’ deep in rock and clay. It’s almost impossible to find and dig them all out. It’s been in place for decades so the patch is large. A landscaper told me that it was popular in the 1970’s but that something killed off most of it. He doesn’t know what did it.

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Answer 1

Since there may be quite a few restrictions on what methods you are permitted to use in your area, I would opt for a treatment that is without chemical means. Solarizing soil can be a very good way to do so.

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm

https://www.gardeningknowhow.com/edible/herbs/st-johns-wort/controlling-st-johns-wort.htm