When I lived in Wilton Connecticut I had lots of Sanguinaria canadensis 'Multiplex'. I would faithfully divide clumps every three years or so, having been advised that this was a good thing to do since the sterile / non-seed producing tubers were vegetatively quite vigorous (something I found to be quite true.) There were so many that after a while I lined woodland paths in the garden paths with them. This garden had ideal conditions - five 100-year old white oaks for canopy shade, a gardener's holy grail of high organic soil that was moisture-retentive but free-draining. Much of my success could be attributed to the site, rather than my skill. And one Spring about 95% of the bloodroot wasn't there, never came up. Ever ready to assume guilt (I did / didn't do something) - except Dick Redfield in Scotland, Connecticut had exactly the same thing happen that very same year. And Dick was a superlative gardener. O.K. Bamboo around the world flowers and dies. But bloodroot and snowdrops? Is a mystery. Deer didn't eat them (besides, I had an electric fence.) They weren't planted in a soggy, boggy place. They'd been thriving for years and then - poof! they vanished. And that's what I love about gardening. It is the never-ending story with always more to learn. Judy in New Jersey where we're having a heat wave - it is 44.8 degrees Fahrenheit. The sunny side of our road has places clear of snow, but not mine.