Though not exhaustive, the following is an example list of veggies, herbs and flowers typically available in the Summer.
Tomatoes
Sweet Peppers
Hot Peppers
Cucumbers
Basil
Cilantro
Dill
Parsley
Sage
Okra
Summer Squash
Carrots
Potatoes
Sunflowers
Zinnias
Marigolds
Cosmos
Bee Balm
Beets
Swiss Chard
Eggplant
Garlic
Celosia
Lavender
Ground cherries
Oregano
Chives