‘Rocky’ is a fast-growing, wild-type arugula that grows in a compact rosette form. Wild arugula has a slightly stronger, more complex flavor than regular arugula, and is perennial in USDA zones 6—10. Its flavor can be described as peppery or mustardy with a hint of nuttiness. Most often eaten raw in salads, arugula can also give pizzazz to pizza or be enjoyed simply steamed.
Botanical Name: Diplotaxis tenuifolia
Days to Maturity: 40–50 days
Native: Asia and Europe
Hardiness: Frost-tolerant perennial in USDA zones 6–10
Plant Dimensions: 8″–10″ tall at maturity
Variety Information: 2″–6″ soft, green leaves. Wild arugula has more deeply-lobed leaves than common arugula. Edible flowers are yellow.
Attributes: Good for Containers
When to Sow Outside: RECOMMENDED. 2 to 4 weeks before your average last frost date, when soil temperature is at least 40°F; ideally 50°–70°F. Successive Sowings: Every 3 weeks until 4 to 6 weeks before your average first fall frost date. Mild Climates: Sow in fall for winter harvest.
When to Start Inside: Not recommended.
Days to Emerge: 10–15 days
Seed Depth: ¼
Seed Spacing: A group of 3 seeds every 6″
Row Spacing: 6″
Thinning: When ½” tall, thin to 1 every 6″
Harvesting: For the mildest, best-tasting baby greens, pick leaves when 2″-4″ long. Pick individually or cut off the plant at ground level. For the best flavor, harvest before plant begins to flower, unless you plan to eat the flowers.