Wall Lettuce (Lactuca muralis)

Wall Lettuce

Lactuca muralis

It carpets shaded stone walls with dainty yellow blooms, a quiet wild beauty. Biennial herbaceous wildflower; common name: wall lettuce.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Tolerates full shade to partial sun; prefers dappled or indirect light to prevent leaf scorch in hot weather
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Watering Water when the top 2 cm of soil is dry; avoid overwatering to prevent root rot in poorly drained soil
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Temperature Hardy to mild frosts; thrives in cool temperate conditions, avoid prolonged temperatures above 28°C
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Characteristics

  • Leaf: Basal rosette of oblong to lanceolate leaves with toothed margins; stem leaves are smaller and clasping the stem
  • Flower: Small yellow composite flower heads (1–2 cm wide) arranged in loose branching panicles
  • Stem: Slender, green, slightly hairy branching stems
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Care Guide

Watering

Keep soil evenly moist during active growth periods

Fertilization

Diluted organic feed once every 4 weeks. Use low-nitrogen feed to avoid promoting leggy, weak stem growth

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours, dilute 1:20 for root drench to support flowering and foliage health
Pruning
  • Remove spent flower heads to encourage prolonged blooming through the growing season
  • Trim back leggy stems in mid-summer to promote bushier, more compact growth
  • Clear dead foliage in late autumn to reduce fungal overwintering risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No known toxic effects; young leaves are edible in small quantities

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Garden Uses & Culture

Culture: N/A

Usage: Edible young leaves for fresh salads; ornamental ground cover for shaded rockeries