During the past two weeks, corn has “exploded” in growth in many Ohio fields. Under favorable growing conditions corn plants can grow nearly three inches per day between V8 (i.e., the eight leaf collar stage) and V15. However, there is considerable variability in corn development across the state, between neighboring fields, and within fields. Most of this variation can be attributed to planting date differences. Corn planted in mid to late April is at or beyond V13 whereas corn planted in early to mid-June is usually at stages no later than V3-4.