I've had a hellebore growing in the same spot for 4 years now, never has done spectacular, but has got by and flowers every year. This spring it dutifully came up and after it's spring feed/water promply flopped over an died! It looked wilted like a very dehydrated/shocked plant, water did not correct this, and when I finally gave the lifeless stem a tug it came away easily and was rotted at the base.. I've not touched it except to give it it's spring dose of granular fertilizer which I watered in. What gives?