The swollen stems of kohl rabi 'Purple Delicacy' look as if they've just landed from outer space, but this architectural vegetable is a real delicacy. The purple-flushed globe has a taste similar to the sweet, crunchy heart of a broccoli stem, and can be eaten as a crisp raw ingredient in salads or cooked like turnips.
Kohl rabi grows best in firm, fertile soil in full sun and needs consistent watering to avoid woody or split stems. Keep the area weed-free and mulch to retain moisture.
It’s important to harvest the swollen stems while they’re still young and tender - about the size of a golf ball to a tennis ball, as they can turn tough and unappetizing if left too long. Cut the stem at the base with a sharp knife, and use the leaves too if still fresh, as they’re edible and similar to kale. Regular picking encourages steady cropping.