Those red jewels of the early summer harvest have arrived at Concord-area farms. Apple Hill and Rossview Farm both have opened for pick-your-own strawberry season. Of course, if you don’t feel like walking the rows yourself, you can purchase freshly-picked berries at the farmstands or area farmers markets. Apple Hill Farm Pick-your-own strawberries opened on June 14 and will be open Monday through Saturday, 8 a.m. to noon, as weather allows. The address of the strawberry field is 89 Hoit Road, Concord, which is different from the farm address. Cost is $3.50 per pound for pick-your-own, or $7 per quart...