Aaron,
You may add on a fourth Capri to your 'collection'....
The last picture shown by MacArthursPark, the one with that thick skirt of trash, looks to me to be that fourth Caprifig and that trash may be sufficiently fertile and aerated to invite rooting from some of those upright branches. The sizable figs appearing on the wood look wild
Looking now on these new pictures it seems to me that a good deal of figs were already established long ago there, along that creek, on both banks, well before the concrete was brought in.
This is typical in our fields and birds, rats, lizards, etc do like these protected areas to rest, eat,.. and being in a fig wasp ridden country will certainly drop thousands of fig fertile seeds all over
That 'concrete skin' has to be necessarily not too thick and no match to robust fig roots growing underneath...
The cement top skin kept the soil sufficiently moist/hot and the roots kept developping fast and gaining momentum, until the day they push out, opening cracks through which the so called root 'suckers' popped up and here you have a fig raising from the concrete.
In ideal conditions fig roots are silent bulldozers !! Planting in ground, pay attention and get them away from the foundations of your house.
Who would imagine.. LA encircled by caprifigs, figs and wasps !?
A very interesting thread !
Francisco