Make sure to buy heat tolerant lettuce like I said. One day of hot weather can send some into bolting. I said I’d tell you when I found bolt resistant stuff. Buying some other varieties at 10 cents is prudent for quantity and variety, but having resistant varieties get you something later. Some of the cheap ones will be the bolt resistant varieties too.
You can get these at Walmart for about $1 each.
Lettuce:
Salad Bowl Leaf
Burpee Bibb Butterhead
Rosalita Romaine
The Burpee Gourmet Blend with (Prize Leaf, Royal Oak,Salad Bowl, Red Salad Bowl, Mighty Red Oak)
Radish:
Cherry Belle - It’s the fastest growing and least likely to bolt. Plant some right away, with other varieties. You should plant small amounts a week apart for at least a month.
Peppers:
Carnival Mix Bell Pepper Burpee - It’s a mix of 5 varieties in different colors.
I plant the first radishes where warm weather crops like peppers will be planted. The radishes will be out when the peppers go in. By planting later crops of lettuce and radishes under tall crops they can last longer. I actually use leaf lettuce as a living mulch on tall crops. The cool weather crops can go in after the August heat wave passes, for a fall crop.
I see what you decided on but I still will add the following.
You can plant peas in the early spring and Then plant bush beans in the spot for a fall harvest.
A bush cucumber with disease resistance would work out good in the plot, if you eat cukes. They will literally stay in a spot smaller than 3 foot in diameter. They grew well with my peonies. They grow great when planted to hang over a terrace, not that you have a terraced garden. I try to include stuff like this so others reading this get ideas.
This year I’m going to try potatoes again if things work out, and hope to experiment with a few space space saving maximize production methods.