How does your garden grow?

With rows of mystery plants
Because I didn't label them
And pretty herbs all in a row.

No, they're actually not "mystery" plants, as we do have an app with what is planted in the garden and where, but for a quick, "Mom, what is that plant?"  A simple, "It's a veggie!" will have to suffice. 

 There are actually plants up in every square, but some are hard to see at the moment.

Want to venture a guess what this plant is?

(Pictures taken April 28th.)