When the basil plants get tall, it's time to make pesto (or dry it, but that's another story). These plants started out as living basil in the grocery store several months ago. The grocery store can be the source of many growable items (that's also another story). These have been growing inside hydroponically all winter. The plan was to start these from cuttings taken from the basil growing in the yard last season but the cold killed those plants before they could be taken. So the grocery store became the source.