I started these in a four inch pot in my pond about six years ago. The plant's rhizomes are now thicker that a tree trunk so I have to chop them back every year. No matter how much I chop off though, they always seem to come back in force.
One of the kids got a seed packet of pansies (or "Alice in Wonderland flowers" as my wife refers to them) last year. I threw them in a pot and didn't think about them much for the past 9 months. Now they're blooming like there's no tomorrow.
Seems appropriate that my first post is a photo of a sage. I have 40 or so different ones on the property (people keep bringing me new ones and I keep planting them). This is a Salvia Greggii (autumn sage) called "lipstick." The bees and hummingbirds love it.