Plant Profile: Brassica oleracea (Acephala Group)

The term "Brassica," derived from Latin, translates to cabbage. Within the Acephala group, you'll find kale, collards, and borecole (a type of kale), all of which thrive in cooler weather and are often referred to as winter greens. These plants closely resemble wild cabbage and are typically sown in the fall to provide visual interest throughout the winter and into spring.

Kale stands out as one of the most nutritious vegetables available, offering a low-calorie option that is rich in essential vitamins and minerals, including an impressive 200% of the daily recommended intake of vitamin C in just one serving. It can be cultivated in home gardens, arranged in rows, grown in containers, or even utilized as a decorative element in landscaping. For optimal growth, kale requires 12 to 18 inches of spacing, although it can be planted as closely as 6 inches apart if harvested while still young. When grown in containers, a minimum pot size of 6 gallons with a depth of at least 8 inches is recommended.

Among the edible varieties in the Acephala group, 'Blue Curled Scotch' is both nutritious and flavorful, making it suitable for salads and stir-fries. Another notable variety is 'Lacinato,' which offers a sweeter and milder flavor compared to other kale types. 'Georgia Southern' is a popular collard cultivar known for its large leaves and minimal bitterness.

These plants thrive in full sunlight and prefer rich, loamy, moist, well-drained soil. They flourish in cooler temperatures and may require some afternoon shade to endure the summer heat.

Once established, these plants face few pest issues after a frost, with flea beetles being a notable exception. These pests survive the winter as adults in plant debris and can become active in early spring. During unseasonably warm winter spells, they may also target kale and other crucifers. For the sweetest leaves, it’s best to harvest after the first frost. To promote ongoing growth, pick the larger leaves while allowing the central leaves to continue developing.

Cultivars with colored foliage are typically regarded as ornamental rather than edible.

In terms of pests and diseases, cabbage worms, cabbage loopers, flea beetles, slugs, aphids, and caterpillars can pose threats to plant health. Additionally, diseases such as leaf spot and black rot may occur.

For quick identification tips and further details on cultivating, purchasing, and preparing kale, refer to the resources available.