Blackberry

Blackberries fruit the first year after planting. The fruit's green receptacle separates from the plant when the fruit is picked. The core should be small and soft. 

Pick in the morning when fruits and plants are dry and cool. Watch out for bees before you reach in. Carry the berries in shallow trays because they are easily crushed. They also are highly perishable, so keep picked berries in the shade and move them to a cool location as soon as possible.