Wow, Jason, thanks for a great reply! I had not even thought of using plants to breakup the compact driveway (and some gravel; maybe a few inches of crushed rock)!
"...oilseed radishes for biological tilling. They throw big roots down deep, then die and decompose, leaving holes. This was a key part of how Fukuoka rehabilitated his orchards."
Maybe I ought to do a mix of annual produce and as you have suggested what Fukuoka did... cuz, I'm impatient! And I doubt that even the angriest of starving pigs would be all that nosy about rummaging through a driveway most entirely void of life. Maybe I ought to envite Paul over to help dig it all up with this old rusty shovel I have... you know, cuz he's a giant who does those sorts of things with ease and joy.
As for drainage, its pretty decent. What we see in the pics is mostly (what I call) spring sweat which tends to dry out by August. I am more concerned about how much soil I ought to use (about as much as in a
raised bed, I figure; 6-8"), and about the quite compact gravel getting in the way of root systems - as far as the perennial shrubs go. The other generic garden crops I am not too worried about as they tend to have fairly shallow roots. Because this is the highest part of the
land, I thought what I might do is keep piling giant rhubarb leaves etc. (any other suggestions for this?) to make a thick soil get thicker and thicker and thicker like that guy did in that
video I saw not too long ago (guy sticks in a five foot pole into his earth and makes the pole disappear)... or I could keep dumping more soil from the magic soil faery
yard, with the obvious disadvantage of $$$.
Anyone suggest how many dump-truck loads I might need (2-3), and relative cost for that sort of impulsive action?
Thanks again!