That's interesting how they ended up spreading the Martagons like that. I suppose some of those loose scales I found (which were still buried) would have produced bulblets too. I think voles instinctively try to spread their food source much the same as squirrels bury acorns. I have watched them, studied them a lot--because I can't beat them. They're pretty intelligent creatures. I've been pretty lucky the past 2 or 3 years, but this year the record deep snow allowed the ground to thaw in spots under the mulch. By the looks of peoples yards in the area, the voles had a very good winter. There's damage in everyone's yard like the picture below of damage in mine. One poor guy's yard is tore up from end to end so horrific it makes almost make a person laugh out loud. Except it not funny.
Voles are not likely to touch conventional mouse or gopher poisons if they've got enough other food. Somebody told me to try soaking a potato in anti freeze that has a little Coca Cola added to it for sweetness. I might try putting some around the outer edges of the yard next winter.
Photos taken earlier this Spring is one of the 5 areas I have damaged.
