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Most gardeners will not be impressed by this but it's the first time I've had Helleborus niger survive for more than 12 months! Albeit I've kept it in its 3" tube in a tray so is kept moist through the summer. Helleborus niger 'Pink Flush' from Post Office Farm in Ashbourne, a most remarkable place,cheersfermi
Actually I don't find Helleborus niger at all easy - I think many UK gardeners don't, even though it's widely available. Maybe it dislikes wet winters here. Possibly it also needs quite a lime-rich environment? Anyway, I have never managed to keep it going in North Wales.
How old are the oldest clumps of your Helleborus x hybridus?Do you think they need to be divided from time to time, or can they grow for many decades?This is my biggest H.x hybridus, planted as a seedling ten years ago, and every year it just gets bigger and bigger. I'm wondering if there comes a time when it is "too" old, and starts to set back?Picture is from last May, now they are all under snow.
My oldest Helleborus x hybridus is only 5 years old, but as large as your beautiful yellow. It was an extremely vigorous seedling and it looked gigantic from the first year.This doesn't answer your question though. But I've seen very old H. x hybridus in a garden, maybe 20 years at least and they were doing perfectly well.I don't think they need to be divided like other perennials. But it would be interesting to hear what other people who have old specimens have to say on the subject.