Annuals

Lactuca sativa 'Red Oak Leaf'

Red Oak Leaf Lettuce

AsteraceaeMediterranean

At a Glance

Typeannual
Habitrosette-forming
Foliageannual
Height6-8 inches
Width8-10 inches

Growing Zones

USDA Hardiness Zones

2a - 9b
Zone 2a
Zone 2b
Zone 3a
Zone 3b
Zone 4a
Zone 4b
Zone 5a
Zone 5b
Zone 6a
Zone 6b
Zone 7a
Zone 7b
Zone 8a
Zone 8b
Zone 9a
Zone 9b
These zones indicate the coldest temperatures this plant can typically survive.
Frost Tolerancehardy

Overview

Lactuca sativa 'Red Oak Leaf' is a distinctive loose-leaf lettuce cultivar renowned for its deeply lobed, oak-shaped foliage and striking burgundy-red coloration. This non-heading variety forms compact rosettes of tender leaves that reach 6-8 inches in height with a spreading habit of 8-10 inches across. The leaves display pronounced indentations that closely resemble oak foliage, creating an elegant architectural form as the plant matures. The most remarkable feature of Lactuca sativa 'Red Oak Leaf' is its vibrant reddish-bronze pigmentation, which is most intense along the leaf margins and tips, gradually transitioning to deep green toward the base and prominent midrib. The leaves maintain a smooth, slightly glossy texture throughout the growing season and remain tender and delicate even as they reach full size. Unlike crisphead varieties, this cultivar produces continuously harvestable outer leaves while the center continues generating new growth, significantly extending the productive harvest period and making it an excellent choice for cut-and-come-again harvesting.

Native Range

Lactuca sativa originates from the Mediterranean basin and western Asia, where wild lettuce species still grow naturally in rocky soils, disturbed sites, and open woodlands. The specific cultivar 'Red Oak Leaf' was developed through selective breeding programs during the mid-20th century, building upon the genetic diversity of these ancient Mediterranean populations.

Suggested Uses

Lactuca sativa 'Red Oak Leaf' excels in vegetable gardens, raised beds, and container plantings where its colorful foliage provides both culinary and ornamental value. The attractive burgundy-red leaves make it suitable for edible landscaping and decorative kitchen gardens, particularly as border plantings or mixed with herbs and flowers. Ideal for succession planting every 2-3 weeks to ensure continuous harvests throughout the growing season. Works well in window boxes and patio containers for easy access, and the compact size makes it perfect for small-space gardening and urban growing situations.

How to Identify

Lactuca sativa 'Red Oak Leaf' can be readily identified by its distinctive deeply lobed leaves that closely mimic the shape of oak foliage, combined with characteristic burgundy-red coloration concentrated along the leaf edges and tips. The leaves form a loose, open rosette without developing a central head, distinguishing it from butterhead and romaine types. Key identifying features include the smooth leaf texture, tender consistency, and the gradual color transition from deep red margins to green bases with prominent light-colored midribs. The compact, low-growing habit and continuous production of new leaves from the center further distinguish this variety from other red lettuce cultivars.

Appearance

Bloom Information

summer when plant bolts due to heat stress or day length triggers

Detailed Descriptions

Flower Description

pale yellow

Foliage Description

burgundy-red margins transitioning to deep green at base with prominent light-colored midribs

Growing Conditions

Sun Requirements

full sun to partial shade

Soil pH

6.0-7.0

Water & Climate

Water Needs

consistent moderate moisture with even soil hydration

Frost Tolerance

hardy

Time to Maturity

45-55 days

Care & Maintenance

Care Guide

Lactuca sativa 'Red Oak Leaf' requires consistent moisture and well-draining, fertile soil enriched with organic matter for optimal growth and color development. Maintain even soil moisture through regular watering, as drought stress triggers premature bolting and results in bitter-tasting leaves. Apply a balanced fertilizer every 2-3 weeks during the growing season, or incorporate well-aged compost into the planting area before sowing. In regions with hot summers, provide afternoon shade or use shade cloth to prevent heat stress and maintain leaf quality. Mulch around plants with organic material to retain soil moisture and suppress weeds while keeping the crown area clear to prevent fungal issues and rot.

Pruning

Lactuca sativa 'Red Oak Leaf' benefits from regular harvesting rather than traditional pruning techniques. Cut or carefully pinch individual outer leaves at the base when they reach 4-6 inches in length, allowing the growing center to continue producing fresh foliage. Remove any yellowing, damaged, or insect-affected leaves promptly to maintain plant health and prevent disease issues. If flower stalks begin to emerge from the center, pinch them out immediately to prevent bolting and extend the productive harvest period. Harvest in the early morning when leaves are crisp and fully hydrated for the best flavor and texture.

⚠️ Toxicity Warning

Lactuca sativa 'Red Oak Leaf' is completely non-toxic and safe for human consumption at all growth stages. All parts of the plant are edible, though the tender leaves are the primary harvest. The cultivar is generally safe around pets and children, with no known adverse effects from consumption. As with all lettuce varieties, wash leaves thoroughly before eating to remove any soil particles or potential contaminants.

Planting Guide

Planting Methods & Timing

Planting Method

direct sow

Indoor Start

4 weeks before last frost

Direct Sow Timing

early spring through fall, avoiding extreme summer heat periods

Days to Maturity

45–55 days

Plant Spacing

8 inches

Companion Planting

Good Companions

carrots
radishes
chives
garlic
onions
tomatoes
basil
cilantro
dill
marigolds

Avoid Planting With

fennel
large brassicas that may shade lettuce
tall sunflowers
corn
Lactuca sativa 'Red Oak Leaf' (Red Oak Leaf Lettuce) - Identification & Care Guide | PlantRef