Dry farmed cucumbers?

While walking around a field that we spread wood chips on, I ran across some volunteer cucumbers growing.

It is October and it never rains in the summertime, so these cucumbers germinated and grew with no rain and no irrigation, amazing.  Also they are deep green and very healthy.  The cucumbers in our greenhouse died several weeks ago from powdery mildew.  Yet these "field" cukes have no powdery mildew.  Maybe a deer ate a large cucumber we threw away and deposited the seeds in a pile of fertilizer?

Seeing how well these volunteer cukes look, I will try to see how to plant a large bed of dry farmed cucumbers, next year.

Same cukes as above.  Notice the "planting" of cukes on the right is water deprived.

Our greenhouse cukes died and dried up a few weeks ago due to powdery mildew.