Those are my favorite crocuses, too Monsterosa! (I'm sorry, but that's how I read your name).
For years I've read about the spreading habits of snowdrops, crocus and scylla. I have yet to see it. I planted 5 snowdrops years ago and have 3 remaining. I have planted hundreds of crocus in my time and yet only have 3 very small clumps of yellow, striped and deep purple (nowhere near one another, either) to show for it. The scylla looks like it might finally be taking hold in the front bed, but it's iffy.
I can't only blame the squirrels (rats with bushy tails, I call 'em). IMO, it's the soil as well. Unfortunately, amending it also makes it much easier for the squirrels to dig up the bulbs/corms. Can't win.
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