I planted a seed from a clementine a few months ago, put it in a cup. Had a bunch of clementines, ate'em, enjoyed'em. One of them had a seed, and I kept it. A little project for B1 and me. I put some marbles in the bottom, for drainage, then put soil atop, and then planted the seed. Wasn't sure what would happen, if anything, but I would periodically water the soil, had the little cup on the windowsill. A hope, a promise, new life, new love. That kind of thing.
I was pleased to see that yesterday, a seedling has sprouted -- a slender finger of green. I'm very, very pleased.