Invasive Russian Sage
I have Russian Sage popping up all over in my garden, I try pulling out some of the new growth, but it seems pretty well established with large root and stems. Also wondering if all the roots will tend to kill off other plants. I have planted several taller flowering shrubs in the same bed, and it dies off within the first year.
Russian sage does spread by underground rhizomes. Usually the new shoots pop up within a few feet of the parent plant. If you'd like to keep the plant confined, you can dig out the new shoots and the lateral roots from which they arise. I know of no research that shows that Russian sage has an allelopathic effect on other plants similar to that of black walnut or quackgrass, but perhaps there is something to it that affects certain other plants.
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