Cane, there really are some things you can plant now.
Peas.
Try planting some Alaska Peas for shelling or for dry. They'll grow a couple feet tall in two months. Alaska is a good strong little variety. I put a few in just for garden munchies. After I have them producing for a couple weeks I'll remove most of them and put more bush Beans where they were.
Summer Radishes
Another quick one to plant before other things that can finish in time to put something else in.
Lettuce
Practically any variety is good for a quick early picking, and if you want, you can plant a patch just for your Chickens. Not sure if they still have it, but Shumway's seeds used to have a variety of Lettuce just for Chickens. Oh heck, I never grew that variety, but the way they described it, my guess is that it was simply a mix of similar leaf Lettuces that was not especially selected for bolt resistance, just quick leaf growth.
Kale, Kohlrabi
That Lacinato Dinosaur Kale is tough for planting almost any time, and Kohlrabi is always fun to grow. It is so cool to actually discover the best planting window for something like Kohlrabi. I grew some in Montana, my first try, and got those nice above ground bulbs. Then I started picking them to munch on. I discovered that they seem to be made in layers, lol. The skin, aaah, ok, edible, barely. Just inside the skin, ok, kind of tough. Chew through and swallow. Then, that sweet and really good nice and deep layer! Smooth texture, me like, yummmz! Then there is a central heart. Ya know, my guess is that would be good too, probably if it was put into soup or mashed and mixed with potatoes or in some recipe. That heart center is smaller or bigger depending on when it is picked I guess.
You might try finding the right window for turnip planting.
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Meantime Cane, peruse through the local around here seed company. They are super enviro green organic rainbows and flowers in their hair...Here's their compost crops page. They also have a forage crops page...
http://www.bountifulgardens.org/departments.asp?dept=5