Vegetables

Lactuca sativa 'Black Seeded Simpson'**'

Black Seeded Simpson Lettuce

UnknownMediterranean

At a Glance

TypeVegetable
Habitrosette-forming
Foliagedeciduous
Height8-12 inches
Width8-12 inches

Overview

Lactuca sativa 'Black Seeded Simpson' is a popular loose-leaf lettuce cultivar prized for its exceptional tenderness and reliable performance in home gardens. This heirloom variety produces large, light green leaves with deeply ruffled and frilled edges that form an open, non-heading rosette typically reaching 8-12 inches in both height and spread. The leaves are thin, delicate, and have a mild, sweet flavor with excellent crisp texture when young, making them ideal for fresh salads and sandwiches. The distinguishing feature of this cultivar is its black seeds, which give the variety its name and help differentiate it from similar loose-leaf lettuces. The leaves emerge as bright green with prominent white midribs and develop increasingly ruffled margins as they mature. Unlike heading lettuces, Lactuca sativa 'Black Seeded Simpson' allows for continuous harvest by picking outer leaves while the center continues to produce new growth, making it an excellent choice for cut-and-come-again harvesting throughout the growing season.

Native Range

Lactuca sativa originates from the Mediterranean region and western Asia, where wild lettuce species can still be found growing naturally in rocky soils and disturbed areas. The cultivar 'Black Seeded Simpson' was developed in the United States during the 19th century and has become a cherished heirloom variety among American gardeners.

Suggested Uses

Lactuca sativa 'Black Seeded Simpson' excels in vegetable gardens, raised beds, containers, and window boxes where space efficiency is important. This variety is particularly well-suited for succession planting every 2-3 weeks to ensure continuous harvests throughout the growing season. The attractive, deeply ruffled foliage makes it an excellent choice for ornamental edible gardens and as an attractive edging plant in decorative kitchen garden designs. Perfect for cut-and-come-again harvesting systems and ideal for fresh salads, sandwich garnishes, and culinary applications where tender, mild-flavored greens are desired.

How to Identify

Lactuca sativa 'Black Seeded Simpson' can be identified by its loose, non-heading growth habit with light green, deeply frilled and ruffled leaves that form an open rosette. The leaves display prominent white midribs contrasting against the light green foliage and have a thin, tender texture that distinguishes them from more robust lettuce varieties. When the plant goes to seed, it produces distinctive black seeds rather than the white or light-colored seeds common in many other lettuce varieties. The plant maintains a low-growing, spreading habit and completely lacks the tight head formation characteristic of iceberg or butterhead lettuces.

Appearance

Bloom Information

summer when bolting in hot weather

Detailed Descriptions

Foliage Description

light green with white midribs

Growing Conditions

Sun Requirements

full sun to partial shade

Soil pH

6.0-7.0

Water & Climate

Water Needs

moderate to high

Frost Tolerance

hardy

Time to Maturity

45-50 days

Care & Maintenance

Care Guide

Lactuca sativa 'Black Seeded Simpson' requires consistent moisture and cool growing conditions for optimal leaf quality and tenderness. Water regularly to maintain evenly moist but not waterlogged soil, as drought stress will cause the leaves to become bitter and trigger premature bolting. Apply a balanced fertilizer at planting time and supplement with nitrogen-rich fertilizer every 2-3 weeks during active growth to maintain vigorous leaf production. Mulch around plants to retain soil moisture and keep the root zone cool, which is essential for preventing early bolting. In hot summer weather, provide afternoon shade or use shade cloth to maintain leaf quality and extend the harvest period.

Pruning

Lactuca sativa 'Black Seeded Simpson' does not require traditional pruning, but regular harvesting serves a similar function in maintaining plant health and productivity. Remove outer leaves by cutting them cleanly at the base when they reach 4-6 inches in length, always leaving the central growing point intact to ensure continued leaf production. Promptly remove any damaged, yellowing, or insect-damaged leaves to maintain overall plant health and appearance. When flower stalks begin to emerge, pinch them out immediately to prevent bolting and keep leaves tender, though this technique only provides temporary relief during hot weather conditions.

⚠️ Toxicity Warning

Lactuca sativa 'Black Seeded Simpson' is completely non-toxic and safe for human consumption at all stages of growth. The leaves are commonly eaten fresh in salads or lightly cooked in various culinary applications. All parts of the plant are generally safe for most household pets, though consuming large quantities may occasionally cause mild digestive upset in sensitive animals.

Planting Guide

Planting Methods & Timing

Planting Method

both

Indoor Start

4 weeks before last frost

Direct Sow Timing

early spring, 2-4 weeks before last frost date

Days to Maturity

45–50 days

Plant Spacing

6 inches

Companion Planting

Good Companions

carrots
radishes
chives
garlic
onions
herbs
spinach
arugula

Avoid Planting With

fennel
sunflowers
large brassicas