Common Ragweed
ambrosia artemisiifolia
Also known as: ["Hay Fever Weed","Short Ragweed"]
Overview
A widespread annual herb known for its highly allergenic pollen, which is a major cause of hay fever in late summer and fall.
Benefits & Perks
["wildlife attractant (bees, butterflies, birds)","drought tolerant","low maintenance"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Ambrosia |
| Botanical Name: | Ambrosia artemisiifolia |
Plant Characteristics
Basic Information
- Category: Herbs & Weeds
- Suitable Location: open fields, meadows, or disturbed areas
- Suitable For:
- Is Weed: No
- Allergenicity: high
Environmental Needs
- Climate: {"temperatureRange":"5–35°C"}
- Hardiness: {"zones":"3–9"}
- Misting: rarely required
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, loamy soil with organic matter; can tolerate poor soils.
Maintenance Level
- Maintenance Level: very low
- Toughness Level: very high
- Pruning Frequency: As needed, typically every 2–3 months or after flowering.
- Pruning Intensity: Moderate; remove up to one-third of growth if necessary.
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade; 6–8 hours of direct sunlight per day; adjust for intense summer sun.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight; protect from harsh midday sun to prevent scorching; adjust placement based on indoor/outdoor conditions.
Care Requirements
Care Difficulty
very easyeasy
Sunlight
full sun to partial shade
Rotate plant for even growth; provide shade during peak summer hours; monitor for sunburn.
Watering
every 7–10 days, allowing soil to dry between waterings
Water thoroughly but infrequently; ensure soil dries between waterings; avoid overwatering.
Soil
well-drained, sandy loam
pH: Slightly acidic to neutral (pH 6.0–7.0).
Avoid heavy clay soils; ensure good drainage; amend with organic matter if needed.
Temperature
Prefers warm temperatures (65–85°F); tolerates mild frosts but thrives in moderate warmth.
Protect from frost; avoid sudden temperature swings; maintain moderate warmth.
Fertilizing
every 4–6 weeks during growing season
Fertilize sparingly; use balanced nutrients; stop in dormant periods.
Propagation
Methods
Stem cuttings or seeds; stem cuttings are more reliable for home growers.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Plant in medium.
- Keep moist and warm.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm, humid conditions with indirect light; maintain consistent moisture.
Medium
Well-draining potting mix with perlite or sand; can also root in water.
Hormone
Optional but recommended for faster rooting.
Timeline
Roots develop in 2–4 weeks; new growth appears in 6–8 weeks.
Tools Needed
Pruning shears, rooting hormone, small pots, well-draining mix.
Quick Tips
Use healthy, non-flowering stems; keep cuttings out of direct sun; maintain humidity.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips for bushier growth; cut just above a leaf node or bud.
Pruning Plan
Prune to maintain shape, encourage bushiness, and remove dead or diseased growth.
Tools
Pruning shears, sharp scissors, gloves.
Checklist
Sterilize tools; prune dead/damaged growth; shape as desired; clean up debris.
Repotting Guide
Best Season
Spring, before the active growing season begins.
Pot Size
Choose a pot 1–2 inches larger in diameter than the current one.
Method
Remove plant gently; trim roots if crowded; place in new pot with fresh soil; water lightly.
Suggestions
Repot every 1–2 years or when roots outgrow the container; beneficial for growth.
Checklist
Check root bound status; prepare new pot; use fresh soil; 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; ensure good aeration.
Temperature Stress Management
Signs of Temperature Issues
Wilting, yellowing leaves, stunted growth, or bud drop in extreme temperatures.
Cold Stress
Slows growth, may cause leaf drop, and can lead to root damage in prolonged cold.
Solution: Move to a warmer location; provide frost protection; reduce watering in cold periods.
Hot Stress
Leaf scorch, wilting, and reduced flowering due to excessive heat.
Solution: Provide shade during peak heat; increase humidity; water more frequently but avoid waterlogging.
Fertilizing Guide
Fertilizing Checklist
Check season; dilute fertilizer; apply to moist soil; avoid contact with foliage.
Fertilizing Method
Use a balanced liquid fertilizer diluted to half strength every 4–6 weeks during growing season; avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicCommon ragweed is generally non-toxic to cats. Similar to dogs, ingestion may cause mild gastrointestinal upset but is not considered harmful.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten or touched
Dogs
Non-toxicCommon ragweed is generally non-toxic to dogs. While ingestion may cause mild gastrointestinal upset, it is not considered harmful.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten or touched
Humans
Slightly ToxicAmbrosia artemisiifolia, commonly known as common ragweed, is primarily known for its allergenic pollen, which can cause significant respiratory issues in sensitive individuals. The plant's leaves may also cause mild skin irritation upon contact.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if touched or inhaled
Frequently Asked Questions
Q: Is Common Ragweed toxic to pets?
A: No, the plant itself is non-toxic to dogs and cats, though its pollen can cause severe allergic reactions in humans and animals.
Q: Why is Ragweed considered a weed?
A: It is classified as a weed due to its invasive growth habit and its role as a primary allergen source during late summer and fall.
Q: How can I control Ragweed in my garden?
A: Hand-pulling or using herbicides can help control it, but it is highly resilient and may require repeated efforts.
Quick Reference
| Family: | Asteraceae |
| Care: | very easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days, allowing so |
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