Cleaning out the shed the other day, I found a bag of winter aconite tubers (Eranthis hyemalis). Christmas in July! I am not sure if they’ll be viable, having been out of the ground for so long, but I will certainly give them a go. I may soak them 24 hours to see if that helps. They’ll get an extra helping of compost just for being themselves.
I know this bag survived a hungry mouse or two that resided in my shed this year. Not that I recommend offering the tubers as mouse bait, but if you have garden rodents, know that they might eschew nibbling these in favor of, say, your bird seed.