How to Grow Red Rock Cress
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Red Rock Cress
Arabis coccinea
flowerRed Rock Cress is a low-growing alpine perennial native to rocky mountain habitats, prized for its vibrant crimson to scarlet flowers that bloom in dense clusters. This hardy, drought-tolerant plant forms compact mounds of small leaves and is ideal for rock gardens, alpine troughs, and well-drained border edging. It attracts pollinators and adds early spring color to xeric landscapes.
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Example Red Rock Cress timeline · Pittsburgh, PA (Zone 6b)
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Plant Red Rock Cress
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Red Rock Cress blooms
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Red Rock Cress dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8; prefers cooler climates and well-drained sites
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Germination & Seedling
2-3 weeksTiny seedlings emerge with cotyledons and first true leaves appearing. Plants are delicate and need consistent moisture without waterlogging.
Provide bright light indoors; maintain 60-70°F; use well-draining seed mix; reduce watering frequency once true leaves appear
Vegetative Growth
4-6 weeksSmall rosettes of narrow, hairy leaves develop in tight mounds. Plant builds root system and establishes compact form.
Thin seedlings to proper spacing; harden off before transplanting outdoors; maintain good air circulation; avoid excess moisture around foliage
Flowering
4-6 weeksDense clusters of tiny, bright red to scarlet flowers appear on short racemes above the foliage. Blooms typically appear in spring (April-May in northern zones).
Deadhead spent flowers to encourage continued blooming; reduce watering during bloom period; provide well-drained location; avoid high-nitrogen fertilizer
Seed Development
3-4 weeksAfter flowering, seed pods (silicles) develop. Foliage may look tired; some varieties self-seed readily.
Allow some flowers to mature for seed collection if desired; cut back after flowering to promote compact form and prevent excessive self-seeding
Dormancy
3-4 monthsIn winter, plants enter dormancy with foliage remaining but growth minimal. Alpine plants are extremely cold-hardy.
Ensure excellent drainage to prevent winter rot; minimal watering; no fertilizing; provide winter protection only in extreme conditions (mulch carefully to avoid crown rot)
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove debris; use copper barriers; encourage ground beetles; apply diatomaceous earth around plants
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Ensure good air circulation; avoid overhead watering; apply sulfur or neem oil if needed; remove affected foliage
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Most critical issue—provide excellent drainage; avoid overwatering; use well-draining soil mix; improve air flow around plants
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Remove damaged leaves; use row covers on young plants; apply neem oil or insecticidal soap if infestation is severe
Uses
Early Pollinator Source
WildlifeRed Rock Cress provides crucial nectar and pollen for early spring insects, including bees, butterflies, and other pollinators emerging after winter dormancy. [source]
Alpine & Rock Garden Design
CraftThe plant's compact form, low mounding growth, and vibrant flowers make it a cornerstone of rock gardens, alpine troughs, and xeriscape designs. [source]
Cut Flower Arrangement
HouseholdThe delicate red flower clusters add color and texture to spring bouquets and can be cut when blooms are fresh and fully open. [source]
Edible Flowers
CulinaryLike other Arabis species, Rock Cress flowers are technically edible with a mild, slightly peppery flavor and can garnish salads, though primarily grown for ornament. [source]
Traditional Alpine Herbal Use
MedicinalSome alpine cultures have traditionally used Arabis species in folk remedies, though modern medicinal applications are limited and largely undocumented. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Rock Cress is not harvested for fruit or vegetables. Enjoy the blooms in the garden; cut sprigs for fresh bouquets in early spring when flowers are fully open. For seed collection, allow flowers to mature, then collect dried seed pods in late spring and store in cool, dry location.
Fun Facts
- 🌱 Arabis coccinea is native to high-altitude rocky areas and was named 'coccinea' for its brilliant scarlet color, derived from the Latin word for 'scarlet' (coccineus).
- 🌱 This species is sometimes confused with Arabis blepharophylla (alpine rock cress), but A. coccinea is hardier and better suited to colder zones.
- 🌱 Rock Cress is a member of the Brassicaceae (mustard) family, meaning it shares genetic relatives with broccoli, cabbage, and other cruciferous vegetables.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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