Chard, Perpetual Spinach Type, "Erbette"
Not all chards are the familiar "Swiss" or "silverbeet" type, with broad ribs and glossy leaves. The perpetual spinach types have small stems, and softer, more tender leaves. They look and taste much like spinach, without the more mineral taste and tougher texture that chard often has. They are more heat-resistant than spinach, and make a deep taproot that gives them tremendous vitality and drought-resistance. I have seen these live for several years in the garden, pumping out tender green leaves even through the summer, with very minimal care. Not quite as hardy as kale, but faster-growing and more heat tolerant, Perpetual Spinach Chards produce more greens in a small space than anything else I know.