I've got a new obsession -- a tiny little buttercup, Ranunculus ficaria
Here's the low down on what it needs: sun or shade, happiest in wet soils, but not picky. It is a spring ephemeral, meaning it pops up early, blooms its head off along with things like daffodils and tulips, and then vanishes underground for the rest of the year. Which, for people like me who try and cram too many plants into too little space, is a good thing.
The wild species forms a mass of shiny green leaves topped with bright, bright yellow flowers. Nice enough, but not too exciting. But never fear, the cultivars are amazing.
For foliage, try these black-and-silver leaves of 'Dusky Maiden'
If you prefer subtler flower color, the over-sized pale yellow blooms of 'Randal's White' are for you
The same goes for perhaps the very cutest of them all: 'Collarette'
You can get them all, of course, from my new employer, Arrowhead Alpines