What are the pros? Vigorous, Pest-Free
What are the cons? Initial Germination Tricky
Once you overcome the hit or miss germination, this species is pretty much unstoppable. Its as hardy as Bocking Comfrey, and forms an ever-expanding clump with 2 foot long leaves that reaches 8-10 feet high. It does not form runners, but once it has completed a flowering cycle it is very possible to have volunteers pop up next summer within a 30 foot radius. Is it invasive? I'll put it this way - I placed a small piece of root in a dense bed of bee balm, and 2 years later it has laid waste to everything in a 4 foot wide circle. The leaves are stiffer, sturdier and less hairy than comfrey, and they trap almost all incoming sunlight. Still, it is one of my favorite plants. I have used it as a living fence around test gardens, and the deer have avoided it.
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