Perpetual Spinach Swiss Chard Seeds 2202 Heirloom Vegetable. While this plant is a member of the chard family, it actually tastes and looks more like a spinach. It is very longstanding in the garden and rarely bolts to seed through the growing season. When planted early it will provide tasty, succulent greens from late spring right through the summer and into the fall. Prolific and very hardy.