Good stuff, Ray.
There are ways of being sneaky and hiding your secrets right out in plain sight.
1. Try to mix ornamental and edible plants together. Long blooming ornamentals will give constant color and will attract the eye away from your edibles. They'll also attract pollenators.
2. Stay away from rows. Plant things like lettuce is little "drifts" -- space filling, but not large areas. From a
permaculture perspective, you don't want monoculture-y rows where bad bugs just march down the row of broccoli and ravish it like submarine sailors on shore leave at a buffet restaurant --- you are trying to confuse the bad bugs by making it difficult to find all the tasty things all in one place.
3. Obviously tall plants like corn, okra or tomatoes will stand out and be easily identified, but cabbage, beets, carrots, lettuce, etc. are easily tucked in and among the other plants. So veggie selection is important. I start my cabbages indoors in Feb., and them transplant them to pots in March. They go into the garden when they are about 6" tall or so -- usually in April. I tuck them in here and there --- but never two
side by side.
4. You mentioned herbs. Herbs are nice. In zone 8A, you
should be able to grow thyme, low creeping rosemary, chives, oregano, savory . . . all plants that will remain relatively low -- under 6" or so . . . and in your zone, they'll grow year-round. Mint is invasive as all hell. Say no to mint --- a firm loud no. Any good nursery will have a variety of herbs for a buck or two for a 2" pot. Don't crowd them -- they'll want to spread out a bit, and if you use them regularly, you'll want to let them grow enough so you don't hurt the plant when you harvest.
5. Peppers are a nice ornamental plant that give and give and give. I grow serranos, jalapenos, and arbol as ornamental plants. They can be clipped back to keep them lower (perhaps not 12", but I keep mine below 2 feet). When the chilies are green, you don't notice them, but as they hang on the plant and turn red, they are a nice little dash of color against the dark green leaves of the plant. I'm in zone 9b, and my chilis will regularly grow 2 years -- sometimes 3. When they get too tall, off with their heads. They'll bush out.
6. Comfrey makes a nice ornamental plant. Bocking 14. Give it enough space, as they'll spread about 3 feet across. Once it is established, you can regularly chop and drop it for fertilizer and mulch. If you planted it on the front of your berm, it could be a visual barrier to hide other stuff behind. Fennel might also fall into this category, although it gets very tall -- 4 feet or so. Fennel self-seeds like crazy, so it can be a pain if you don't keep tabs on it.
7. Large vining plants probably will not work for you (pumpkins, gourds), but less aggressive vines like cucumbers or even watermelon (slightly larger, but I really like the look of the leaves and vines) might be trained to go where you want them to go. You could tug the vines around and tuck them around a corner or behind a visual barrier.
8. Keep your spacing generous. If the plants are spaced apart and don't look too crowded, they will not look messy. One or three beets, spaced 10 inches from one cabbage, spaced a ways away from a marigold bush, which is 18 inches from your rosemary plant . . . it looks nice. If stuff is crowded, it will compete for sunlight, causing it to grow up and get leggy. The goal is to make it look like a flower bed, not a commercial production farm.
9. A uniform mulch laid-down between plants will visually unify the space. I love
wood chips and use them all over, but finding a nice uniform looking batch of chips can be difficult. I've never payed for them (EVER). You kind of have to take what you get when a tree trimmer agrees to dump a load of them on the driveway. If you wished, you could order 2 or 3 (or 4) yards of a nice, uniformly sized wood chip mulch and lay those down between the plants. It'll
save water, keep weeds down,
feed the soil, become a worm nursery, and all sorts of other wonderful things. As chips sit in the sun, the fade to a lovely light brown color. Don't use
straw or anything else that looks messy. You can use finished
compost as a mulch. Keep your pile in the back, and then cart it to the front yard and lay it down as needed.
10. Not too much nitrogen. While it will help your plants grow rapidly and turn dark green, N will also make them leggy and prone to flop over. Too much N will give you long vines and branches, but no appreciable increase in harvest. You might want to mulch with
coffee grounds, evenly spreading them around throughout the growing season. This will look good and will also provide all the N your plants need.
11. Consider starting small. A new 3' x 8' "flower bed" that is 60/40 flowers/veggies the first year will look nice and isn't threatening. Then slightly expand it a foot or two in either direction next year, with a 50/50 mix of ornamentals to edibles. By year 3, your neighbors will see you working in it and won't think twice about it, even though it may now be 35/65 flowers to veggies. Cut some flowers for your neighbors.
12. Promptly pull out anything that gets overgrown, is dying, or has passed beyond its peak. Zucchini plants get big and floppy and powder mildew'y. Stuff like that is a poor choice for a front yard garden. Plant it in the back yard. You mentioned asparagus -- not a good choice, as it only bears for a short time, and then you've got to let it grow out. It's a messy plant that grows 4 feet tall or more, flops all over, and really doesn't give you much production for the space it requires. It looks bad for 6 months before you finally get to hack it back for the winter. If you don't let it grow like that (or clean it up too quickly) you won't get any reasonable production next season.
13. Taking out a small tree -- like, how small? Is the trunk less than 2 inches in diameter? Just dig it out. Stick a spade through the
roots on one side, bend it over and yank it out. Many trees will sucker off the roots left in the ground, so you'll be digging up those roots forever. I'd stay away from using an herbicide (and be careful with that word around here --- there are anti-Round-Up forces waiting to pounce). Herbicide can leach through the plant, down to the roots and are pumped out through the
root exudates. Seriously. You'll render your soil toxic for a couple of years that way. The half-life of Round-Up is far greater than anything they'll tell you on the side of a bottle. Girdling it would kill the tree buy may not kill the roots, in which case it will just sucker from below the girdling (depending upon the tree).
If the tree is larger -- trunk 4" or more, you'll have a bit of work ahead of you to dig it out. In our area, we've got day laborers standing on the corners who will work pretty hard for $8 an hour. I'd hire 2 of them and give one a pick and the other a shovel.
I hope some of that helps.