abandoned my garden last few years & the only surviver is the Chard & Beet hybrid, it won the famine drought hardest plant award.
the giant leaf Chard & Sugar Beet cross pollinated & now just keeps growing without water, the large root keep the leafs growing for years.
plus Chard is high in Quercetin, Nitrogen, Sulfur, Potassium, Vitamin C.
its the best one, and grow Alfalfa all around it to keep the soil Nitrogen feeding the soil without fertilizer.