Spring has sprung and summer is on the way. That means German grocery store produce aisles are changing. When produce is in-season you'll see a lot more of it, since it'll be cheaper and likely taste better. When something is out of season it's harder to find, often imported and you'll pay a premium. Here's a guide to what you kind for each season.
Spring and Summer:
Asparagus (scarece after July)
Eggplant
Green & Fava Beans
Broccoli
Swiss Chard
Leeks
Turnips
Strawberries
Blueberries
Raspberries
Cherries
Plums
Rhubarb
Watermelon
Berry season is great in Germany because most bakeries have already started rolling out their strawberry pastries and cakes. I would highly recommend grabbing an “Erdbeer Plunderstücke,” a delicious dish that has a croissant-like flakey crust with a mild pudding center and ripe strawberries on top. In the fall, there will be a switch from strawberry to apple-based treats.
Fall and Winter:
Chinese Cabbage (Pak Choi)
Collard Greens
Kale
Horseradish
Parsnips
Brussel Sprouts (I'm weeping. My favorite.)
Apples
Elderberries
Cranberries
Walnuts
Hazelnuts