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Greg, have you found that your Kirengeshoma is doing okay surrounded by dead nettle as it is? Or have you had it planted there for long? I'm asking as I quite like yellow wax bells & wonder how 'tough' it is. Where I have my dead nettle growing, it seems to overtake everything else growing around it except for the very toughest plants.
Also, if you don't mind me asking all these questions, is this the average size of a 3 year K? Did you start yours from seeds or what? I'm hoping to travel to Korea next year & if Canadian & Korean laws allow it, I'd love to bring some seeds of unusual (for the west) plants back with me that are suitable for growing where I live (the Pacific Northwest - similar to Seattle's weather). No point in bringing anything back that wouldn't grow well here.
Thanks in advance for reading & (hopefully?) answering this!
Dear isom, Sorry for my delay in answering you. I haven't been active on DG for quite some time.
The Kirengeshoma doesn't seem to mind the nettles. I do try to keep the base of the plant free from them, but the nettles have overwhelmed it at times with no apparent negative effect on the plant. Based on that, and the fact that this plant is in deep shade, I have come to consider it a very tough plant.
I think this plant might be a little smaller than it might be if it got a little more sun, but it is one of the few plants that I have had success with in truly deep shade. It does produce flowers in the fall, so it is still getting enough sun for it to complete its reproductive cycle. I have seen some extremely large Kirengeshomas in Connecticut that got part shade; the owner told me that plants were over 10 years old.
As to growing the Kirengeshoma in BC, I don't see why not. The plants on the temperate eastern coasts of Asia seem to be perfectly suited to the temperate eastern coasts of Asia, but I think the slightly different climate pattern in BC would be favorable to the Kirengeshoma. If there were to be a problem with it, it would probably be too warm, but these temperate plants often grow just fine in Zone 8, so I would encourage you to give it a shot.