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Covered with dust

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Free will is arguably the most celebrated character trait in our DNA. As such, we have fulfilled historic ambitions and continue to stretch the capacity of human existence.
Covered with dust

Herbicides and digging, the only way to tame Ruellia

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Dear Neil, I planted the tall version of purple ruellia a few years ago. It’s beautiful and takes no care. However, it’s spreading like wildfire. It even sends runners up underground into my planters, and it’s taking over my ground covers. I can’t imagine digging them all out. I do not use pesticides. Do you have any ideas?
Herbicides and digging, the only way to tame Ruellia