What to do with a hole in the ground

A ten year old boy, enthusiastic about planting seeds and seeming to be just plain happy to be alive: "Miss Lisa...I found a hole over there. Can I use the hand shovel to see what's under it?!" Very excited he digs a little deeper and comes running back over. "Um, can I, um, plant something there? Pleeeease?!". I must have looked doubtful because he said to me in a very committed voice, "I'll water it everyday at snack time! I'll come out here with a cup of water and water it everyday." How could I say no? So, as of yesterday we have a Carrot, I believe, trying to forge a life near our future garden sight, hugged up against a cinder block wall experiencing very little sun. I pray that that thing grows. If it doesn't we'll know that it wasn't due to lack of water!