An oak apple is a small, vaguely apple-shaped gall that forms on many types of oak trees due to chemicals injected by the larva of a gall wasp. But what is an oak orange? You'll find out my take on it here.
Parking at Irvine Regional Park is $3 on weekdays, $5 on weekends, and may be higher for holidays and special events. On Tuesdays between 9am and 1pm parking is free because of the Farmer's Market in Lot 3.