Hairy Sunflower
helianthus hirsutus
Also known as: ["Hairy Sunflower"]
Overview
A robust perennial sunflower species native to North America, characterized by hairy stems and leaves.
Benefits & Perks
["wildlife attractant (bees, butterflies, birds)","drought tolerant","aesthetic foliage"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Helianthus |
| Botanical Name: | Helianthus hirsutus |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: garden bed in open area with good air circulation
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"10–35°C"}
- Hardiness: {"zones":"5–9"}
- 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 poor soils but thrives with enrichment.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: Light pruning can be done anytime; major pruning in late winter or early spring before new growth begins.
- Pruning Intensity: Light to moderate; avoid heavy pruning unless necessary to control size or shape.
Care Details
Ideal Sunlight Coverage:
Full sun (6–8 hours of direct sunlight daily); tolerates partial shade but may produce fewer flowers.
Sunlight Tolerance Tips:
Acclimate plants gradually if moving from shade to sun; protect from intense midday sun in hot climates; ensure good air circulation to prevent mildew in humid conditions.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
full sun to partial shade
Rotate plants for even growth; use shade cloth in extreme heat; avoid placing in drafty areas.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly but infrequently; ensure proper drainage; avoid wetting foliage to prevent fungal issues.
Soil
well-draining, loamy soil with moderate organic content
pH: Slightly acidic to neutral (pH 6.0–7.0).
Ensure good drainage; enrich with organic matter; avoid compacted soil.
Temperature
Prefers warm temperatures (65–85°F or 18–29°C); can tolerate brief periods below 50°F (10°C) but thrives in warmth.
Monitor temperature extremes; adjust watering and light accordingly; protect from sudden temperature shifts.
Fertilizing
every 4–6 weeks during growing season
Apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup; stop fertilizing before winter 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 below a leaf node.
- Remove lower leaves.
- Dip in rooting hormone (optional).
- Plant in moist medium.
- Maintain humidity.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm (70–75°F or 21–24°C), humid, and bright but indirect light; protect from drafts.
Medium
Well-draining potting mix (e.g., perlite and peat moss blend) or water for initial rooting.
Hormone
Rooting hormone is optional but recommended for faster root development.
Timeline
Roots typically develop in 2–4 weeks; new growth may appear in 6–8 weeks.
Tools Needed
Pruning shears, rooting hormone, small pots, well-draining medium, plastic wrap or propagator.
Quick Tips
Use sharp, clean tools to prevent infection; maintain consistent moisture; provide gentle warmth for faster rooting.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips to encourage branching; cut above a leaf node or bud; remove dead or crossing stems.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or diseased parts; focus on removing spent flowers to promote reblooming.
Tools
Pruning shears, sharp knife, gloves.
Checklist
Use clean tools; prune dead or damaged growth; shape as needed; remove spent flowers.
Repotting Guide
Best Season
Early spring before active growth begins.
Pot Size
Choose a pot 1–2 inches larger in diameter than the current one.
Method
Remove plant gently; trim any circling roots; place in a slightly larger pot with fresh, well-draining soil; water thoroughly after repotting.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for container-grown plants to refresh soil and provide space.
Checklist
Select appropriate pot size; prepare fresh soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water deeply; ensure drainage; avoid overhead watering.
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 early in the morning to minimize evaporation and fungal growth.
Watering Schedule Tips
Water deeply once the top inch of soil is dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add compost or well-rotted manure for fertility; incorporate perlite or sand for drainage; mulch to retain moisture and suppress weeds.
Temperature Stress Management
Signs of Temperature Issues
Yellowing leaves or stunted growth in cold; wilting or leaf scorch in excessive heat.
Cold Stress
Slows growth; may cause leaf drop or damage to tender tissues; increases susceptibility to pests and diseases.
Solution: Move potted plants indoors or to a sheltered location; apply a thick layer of mulch to insulate roots; avoid overwatering in cold conditions.
Hot Stress
Leaves may wilt, curl, or scorch; flowers may drop prematurely; growth may slow.
Solution: Provide shade during peak heat; increase watering frequency; use mulch to retain soil moisture; ensure good air circulation.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during active growth; avoid winter feeding; flush soil periodically.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength every 4–6 weeks during the growing season (spring and summer); avoid fertilizing in fall and winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicHelianthus hirsutus is not considered toxic to cats. It does not pose a risk of poisoning or adverse effects when ingested by felines.
⚡ Toxic If:
if eaten
Dogs
Non-toxicHelianthus hirsutus is not considered toxic to dogs. There are no known adverse effects associated with ingestion by canines.
⚡ Toxic If:
if eaten
Humans
Non-toxicHelianthus hirsutus is not considered toxic to humans. It does not produce any known compounds that are harmful when ingested in typical amounts.
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Helianthus hirsutus toxic to pets?
A: There is no reliable information available regarding its toxicity to pets.
Q: How tall does Hairy Sunflower grow?
A: It typically reaches heights of 3 to 6 feet.
Q: Does it require full sun?
A: Yes, it thrives in full sun conditions.
Quick Reference
| Family: | Asteraceae |
| Care: | moderate |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
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