No watering balcony garden

In my climate we have spring and fall rains, but there's a period of time in summer where evapotranspiration exceeds precipitation (i.e. everything dries unless watered). I decided to do a 3 crop rotation (I'm on crop 2 of 3) of potatoes, millet, potatoes; but no watering. Pictures speak 1000 words.  My millet seed was mostly bad (bulk grain section of a super market) but I got 1
live proso millet. The potatoes were harvested with decent yields. The millet in the sun and to give you an idea of how dry it is, the sage in the ground in the front was beginning to wilt. The back yard (the background) is a watered low spot, so yeah,  it's green.

In short,  millet and potatoes have met my approval for low maintenance balcony gardening.