Rock Cress
arabis collina
Also known as: ["Wall Cress","Rock Wall Cress"]
Overview
A low-growing perennial herb native to rocky slopes and cliffs, valued for its small, fragrant white flowers.
Benefits & Perks
["long-flowering","drought tolerant","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Brassicales |
| Family: | Brassicaceae |
| Genus: | Arabis |
| Botanical Name: | Arabis collina |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: rock gardens, alpine troughs, or raised beds
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"–15–30°C"}
- Hardiness: {"zones":"4–8"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, loamy soil with added organic matter; can tolerate rocky or sandy soils.
Maintenance Level
- Maintenance Level: low
- Toughness Level: moderate
- Pruning Frequency: Annually in early spring or after flowering; light pruning can be done as needed.
- Pruning Intensity: Moderate; remove up to one-third of the plant if overgrown, but avoid heavy pruning in late summer.
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade; 6–8 hours of direct sunlight per day, with some afternoon shade in hot climates.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight; protect from harsh afternoon sun; adjust placement based on seasonal light changes.
Care Requirements
Care Difficulty
easymoderate
Sunlight
full sun to partial shade
Rotate plant for even light exposure; use sheer curtains to filter intense light; monitor for signs of sunburn.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly but infrequently; ensure soil dries between waterings; avoid overhead watering.
Soil
well-draining, sandy loam with some organic matter
pH: Slightly acidic to neutral (pH 6.0–7.0).
Avoid heavy clay soils; ensure pots have drainage holes; test soil pH periodically.
Temperature
Prefers cool to moderate temperatures, ideally 50–70°F (10–21°C); tolerates cold but avoid extreme heat.
Avoid sudden temperature fluctuations; protect from frost; maintain consistent humidity.
Fertilizing
every 4–6 weeks during spring and summer
Apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup; reduce feeding in dormancy.
Propagation
Methods
Stem cuttings or division; stem cuttings are more common for home growers.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Apply rooting hormone.
- Plant in medium.
- Maintain humidity.
- Wait for roots.
Best Time: Early spring or late summer when the plant is actively growing.
Environment
High humidity (70–90%), indirect light, and consistent warmth (65–75°F or 18–24°C).
Medium
Well-draining potting mix with perlite or sand; can also root in water initially.
Hormone
Rooting hormone is recommended to improve success rates.
Timeline
Roots typically develop in 3–6 weeks; new growth may take an additional 2–3 months.
Tools Needed
Pruning shears, rooting hormone, small pots, plastic bags or propagator, misting bottle.
Quick Tips
Use healthy, non-flowering stems; keep soil consistently moist but not waterlogged; provide bottom heat if possible.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips for bushier growth; cut just above a leaf node or bud; remove dead or crossing branches.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or diseased parts.
Tools
Pruning shears, sharp scissors, disinfectant (e.g., rubbing alcohol).
Checklist
Disinfect tools; prune during dormancy or active growth; remove dead/diseased parts; shape as desired.
Repotting Guide
Best Season
Early spring before new growth begins.
Pot Size
Increase pot size by 1–2 inches in diameter; ensure good drainage holes.
Method
Remove plant gently; trim roots if necessary; place in a new pot with fresh soil; water lightly.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for rejuvenation and fresh soil.
Checklist
Choose appropriate pot; prepare new soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust for season.
How to Apply Water Properly
Water at the base of the plant, ensuring moisture reaches the root zone; allow excess water to drain away; water in the morning to reduce evaporation.
Watering Schedule Tips
Water deeply once the top inch of soil is dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or sand for drainage; incorporate compost for fertility; use mulch to retain moisture.
Temperature Stress Management
Signs of Temperature Issues
Wilting, leaf scorch, or stunted growth in excessive heat; leaf drop or root rot in cold, damp conditions.
Cold Stress
Low temperatures can slow growth and cause root damage if soil remains waterlogged.
Solution: Ensure well-draining soil; protect roots with mulch; move potted plants to a sheltered location during freezes.
Hot Stress
Excessive heat can lead to dehydration, leaf burn, and reduced flowering.
Solution: Provide shade during peak heat; increase watering frequency; use mulch to retain soil moisture.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer type; dilute correctly; apply during active growth; avoid winter feeding.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength; fertilize every 4–6 weeks during the growing season (spring to early summer); avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicArabis collina is not known to be toxic to cats. There are no documented cases of adverse effects from ingestion.
⚡ Toxic If:
if eaten
Dogs
Non-toxicArabis collina is not known to be toxic to dogs. There are no documented cases of adverse effects from ingestion.
⚡ Toxic If:
if eaten
Humans
Non-toxicArabis collina is not known to exhibit toxic properties to humans. It is generally considered safe for consumption in small quantities.
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Does Arabis collina attract pollinators?
A: Yes, it is known to attract bees and butterflies with its fragrant flowers.
Q: Is Arabis collina suitable for rock gardens?
A: Yes, it thrives in rocky, well-drained environments typical of rock gardens.
Q: How often should Arabis collina be watered?
A: It is drought-tolerant and requires minimal watering, especially once established.
Quick Reference
| Family: | Brassicaceae |
| Care: | easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
Get Expert Care Tips
Download the Plantious app for personalized care reminders and plant identification!
Google Play App Store
