Rock Everlasting
helichrysum rupestre
Also known as: ["Rock Strawflower","Stone Everlasting"]
Overview
A low-growing, mat-forming perennial with silvery-gray foliage and bright yellow, daisy-like flowers that persist long after blooming.
Benefits & Perks
["long-flowering","deer resistant","wildlife attractant (bees, butterflies, birds)","drought tolerant","low maintenance"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Helichrysum |
| Botanical Name: | Helichrysum rupestre |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: rock gardens, slopes, or containers in full sun
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–30°C"}
- Hardiness: {"zones":"7–10"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining
- Soil Type: Well-draining, sandy loam with added organic matter
Maintenance Level
- Maintenance Level: low
- Toughness Level: high
- Pruning Frequency: Light pruning every 2–3 months during growing season; major pruning annually after flowering.
- Pruning Intensity: Moderate
Care Details
Ideal Sunlight Coverage:
Full sun (6–8 hours of direct sunlight per day); tolerates partial shade but may become leggy with insufficient light.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight if moved from shade; protect from harsh afternoon sun in hot climates; ensure good air circulation to prevent sunburn.
Care Requirements
Care Difficulty
easymoderate
Sunlight
full sun
Rotate plant weekly for even light exposure; use sheer curtains to filter intense midday sun; place outdoors in spring/summer for optimal light.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly until it drains from the bottom, avoid frequent shallow watering, and ensure the soil dries out between waterings to prevent root rot.
Soil
well-draining, rocky or sandy soil
pH: Slightly acidic to neutral (pH 6.0–7.0)
Avoid heavy clay soils; ensure pots have drainage holes; top-dress with compost annually.
Temperature
Prefers mild temperatures between 60–75°F (15–24°C); can tolerate cooler temperatures down to 50°F (10°C) but avoid frost.
Avoid sudden temperature changes; protect from drafts; maintain consistent temperatures during active growth.
Fertilizing
every 4–6 weeks during spring and summer
Fertilize only when actively growing; flush soil occasionally to prevent salt buildup; use a low-nitrogen formula for flowering plants.
Propagation
Methods
Stem cuttings
Step-by-Step Propagation Guide
- Take 4–6 inch cuttings.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in moist medium.
- Maintain humidity.
Best Time: Spring or early summer when the plant is actively growing
Environment
Warm (65–75°F), high humidity (70–80%), and bright indirect light
Medium
Well-draining mix of perlite and peat moss or cactus potting mix
Hormone
Recommended to use rooting hormone for faster root development
Timeline
Roots typically form in 3–6 weeks; new growth may appear in 2–3 months
Tools Needed
Pruning shears, rooting hormone, small pots, perlite, peat moss
Quick Tips
Use healthy, non-flowering stems; keep soil consistently moist but not waterlogged; provide bottom heat for faster rooting.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips for bushiness; cut back leggy stems to a healthy bud; remove dead or diseased growth.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or overgrown stems.
Tools
Pruning shears, clean scissors
Checklist
Use clean tools; prune during active growth; remove dead/damaged stems; shape as desired.
Repotting Guide
Best Season
Spring, before active growth begins
Pot Size
One size up (e.g., from 4-inch to 6-inch pot); ensure good drainage holes.
Method
Remove plant gently; trim roots if necessary; place in a slightly larger pot with fresh, well-draining 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 size; use fresh soil mix; trim roots if crowded; water lightly after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water deeply; ensure proper drainage; avoid overhead watering.
How to Apply Water Properly
Water directly at the root zone, ensuring even moisture distribution without saturating the soil. Water early in the morning to minimize evaporation and allow foliage to dry before nightfall.
Watering Schedule Tips
Water deeply once every 7–10 days during active growth in spring and summer; reduce frequency to every 2–3 weeks in fall and winter, allowing soil to dry completely between waterings.
Soil Improvement
Add perlite or coarse sand to improve drainage; incorporate compost for fertility; ensure soil is loose and airy.
Temperature Stress Management
Signs of Temperature Issues
Wilting, yellowing leaves, or stunted growth in cold; scorching or leaf drop in excessive heat.
Cold Stress
Low temperatures slow growth and can cause root damage or leaf drop if prolonged below 50°F (10°C).
Solution: Move to a warmer location or indoors during cold spells; use frost cloth for outdoor protection; ensure good drainage to prevent cold soil.
Hot Stress
Excessive heat can lead to dehydration, leaf scorch, or wilting, especially if combined with intense sunlight.
Solution: Provide afternoon shade; increase watering frequency; use mulch to retain soil moisture; improve air circulation.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during growing season; avoid over-fertilizing; flush soil periodically.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength every 4–6 weeks during spring and summer; avoid fertilizing in fall and winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicHelichrysum rupestre is not known to be toxic to cats. It does not pose a significant risk if ingested in small quantities.
⚡ Toxic If:
Generally non-toxic
Dogs
Non-toxicHelichrysum rupestre is not known to be toxic to dogs. It does not pose a significant risk if ingested in small quantities.
⚡ Toxic If:
Generally non-toxic
Humans
Non-toxicHelichrysum rupestre is not known to have significant toxic effects on humans. It is generally considered safe for handling and consumption in typical amounts.
⚡ Toxic If:
Generally non-toxic
Frequently Asked Questions
Q: Does Helichrysum rupestre attract pollinators?
A: Yes, it attracts bees, butterflies, and other pollinators with its bright yellow flowers.
Q: Is this plant suitable for rock gardens?
A: Yes, it thrives in rocky, well-drained soils and is ideal for rock gardens.
Q: How often should I water Helichrysum rupestre?
A: Water sparingly, as it is drought-tolerant and prefers dry to medium conditions.
Quick Reference
| Family: | Asteraceae |
| Care: | easy |
| Light: | full sun |
| Water: | every 7–10 days during activ |
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