If you squeeze the sides of a snapdragon blossom, it opens its little mouth and says “rawr rawr.” Or maybe that’s me. These flowers are edible, though flavor ranges from bland to bitter. Probably best as a garnish. In Missouri, the plant will stay green through November.
To keep the ground cool while the seeds are germinating, shade it by placing a board over your rows, raising it off the ground with two flowerpots or bricks. Or use shade cloth or even sheer curtains to help keep the plants cool. When the seedlings emerge, remove the board, then mulch the ground with a half-inch of grass clippings or straw. Add more mulch once the seedlings are 1 to 2 inches tall.
It seems a shame to relegate food plants to second place in the garden. They aren’t as tidy as ornamentals, but they were bred to produce bountiful crops, but they can also look very good, and many of them can fit in well in a mixed border.