It's interesting what you can find when you finally weed a long-neglected flower bed. This summer I've been gradually cleaning out the bed in our front yard. We're rarely in the front yard due to its proximity to the noisy four-lane street we live on, and with all the work to be done in the rest of the yard, the front is usually the last part I get around to.
To my pleasant surprise, cleaning out the weeds has uncovered a tiny pine forest. That first photo is of the granddaddy - over two feet tall, but usually completely obscured by a big stand of ornamental grass. The others are smaller (six inches or less) and were smothered by weeds. Instead of pulling up these seedlings (saplings?), I've decided to let them grow. The big one started growing last year and was able to survive the winter, so I want to see if the others survive as well.
I know that, left unchecked, all of these would eventually overwhelm the yard (I've heard that pines excrete acid into the soil to kill off other plant competitors), so if they survive until next year, I would like to replant these in some woods somewhere. Ideally they would be moved to land owned by someone I know, and where I could watch their progress over the years. But if I have to sneak these into a forest preserve, then so be it.