Canyon Dock (Rumex hymenosepalus)

Canyon Dock

Rumex hymenosepalus

Broad fleshy leaves hold desert resilience, a hardy western native. Herbaceous perennial; common names: Canyon Dock, Wild Rhubarb.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerant of intense desert sunlight and high UV exposure
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Watering Water deeply but infrequently; allow soil to dry completely between waterings to prevent root rot
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Temperature Hardy to -10°C; tolerant of high desert temperatures up to 38°C with adequate drainage
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Characteristics

  • Leaf: Basal rosette of large, ovate to lanceolate leaves with wavy margins; fleshy, blue-green texture
  • Flower: Dense branching panicles of small greenish-white to reddish tiny flowers
  • Stem: Erect, sturdy reddish-green flowering stems rising above the basal rosette
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Care Guide

Watering

Water deeply every 7-10 days during active growth; reduce frequency if soil retains moisture

Fertilization

Apply diluted compost tea once monthly. Use low-nitrogen, organic feeds to support foliage growth without promoting leggy stems

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solids to avoid pest attraction
Pruning
  • Remove spent flower stalks after blooming to redirect energy to foliage growth
  • Trim yellowing or damaged basal leaves to maintain a tidy rosette
  • Divide overcrowded clumps every 2-3 years in early spring to improve air circulation
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no documented adverse effects

Humans: Contains low levels of oxalate crystals; mild oral or gastrointestinal irritation if large quantities are ingested raw

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Garden Uses & Culture

Culture: N/A

Usage: Edible young leaves (cooked to reduce oxalate content); traditional medicinal use by Indigenous Southwestern tribes