a boy and his tomatoes

how could i discourage him from picking green tomatoes when he does it with such enthusiasm? besides, he ends up eating most of them raw, so they're not all going to waste.
really though, my red tomato harvest is much smaller than i had hoped. i was hoping to be able to can a lot for use this winter. oh well. maybe next year.
i figure he's cultivating an enjoyment and interest in growing and eating his own food. and really, that is more precious to me than having a higher yield this season.