How to choose the best:
Blackberry

Touch

A firm blackberry is best, and make sure to look out for any blackberries that seem wet or mushy at all.

See

Look for a deep color — from purplish to almost a black hue — without any visible white or green patches.

Some more details:

How to clean

To clean your berries, dunk them in a big bowl of cold water spiked with a tiny bit of vinegar, and then give them a good swirl, being careful not to crush any. After that, make sure to get them very very dry!

How to store

Keep your berries in the fridge, they'll turn quick if left out!

For longest-life, wash them before you put them away, and make sure that they're absolutely bone-dry first. Moisture is the enemy here.

When it's in season

Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.