Ionel, well, that's an amazing experiment. Once a month isn't nearly enough, even to set up a system. But....if you use native vetches and clovers, get seeds from them growing at the side of the road when they turn into seed pods, end of summer, you can throw those out and the local critters will not eat them, you know that the local rainfall will make them work. Try to use as many as possible, let them grow and ramble, and let the seeds fall to the ground and start over again. Collect some and spread them wider and wider. Work on improving your soil with these vetches and clovers.
If you know you have ground water that is near the surface, maybe where wild blackberries are growing, you might consider some really drought tolerant vines, like grapes, and plant them where the berries are, although clear out some berries first. Then mulch them with a minimum of 2 hands depth of mowed weeds, soak them deeply, and that might hold them between your visits.
What kind of water access do you have? Well? spring?
Look out for dandelions, they will compete with your vetches and clovers, and I've never found them to be helpful, and I have a very rural place. Use the natives there, they are your best bet for surviving on their own.
Last edited by sweetpea; 12-06-2012 at 12:49 PM.
"Life flows on within you and without you"...George Harrison
Coastal California, USA, Mediterranean climate - no summer rain, a little frost mid-winter