Last year for Arbor Day, we planted a windowsill orchard from seeds harvested from fruit in our refrigerator. Although we originally planted seeds from a lime, lemon, orange, pear and apple, we now have two apple trees, a pot of chives, and a bottle of carrots growing on our sill.
The lemon, and lime seeds never sprouted - I assume due to some act of genetic engineering, on the part of the fruit growers. The pear, and orange trees sprouted, but didn't survive long, either because the windowsill was too cold, or because of my very brown thumb. Either way, they were replaced somewhere along the way, by the chives, and another apple seed.
Our two little trees, while not big enough to go outside yet, are ready for larger pots. So, I was planning on repotting them with the children for Arbor Day, today. However, since we're experiencing a week of rain, hail, and snow (yes, more snow!), I think the transplanting, which I hope to do on the patio, will have to wait.
Instead, I found some interactive, Arbor Day, coloring pages, at Color.com. So we can mark the day, in a tree friendly fashion, that way.
It's great to be a homeschooler.