American Mountain Ash
sorbus americana
Also known as: ["American Mountain Ash","American Rowan"]
Overview
A deciduous tree native to North America, known for its clusters of white flowers in spring and bright red berries in fall.
Benefits & Perks
["long-flowering","wildlife attractant (bees, butterflies, birds)","seasonal color change"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Rosales |
| Family: | Rosaceae |
| Genus: | Sorbus |
| Botanical Name: | Sorbus americana |
Plant Characteristics
Basic Information
- Category: Trees
- Suitable Location: outdoor garden, adaptable to various soil types
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"–34–43°C"}
- Hardiness: {"zones":"3–7"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Moderate to fast-draining.
- Soil Type: Well-draining, loamy soil with organic matter; tolerates acidic to neutral pH.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: Annually in late winter or early spring before new growth begins.
- Pruning Intensity: Moderate; remove up to one-third of old growth if needed.
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 outdoor vs. indoor conditions.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
full sun to partial shade
Morning sun is ideal; provide shade during peak heat; rotate plant for even light exposure.
Watering
every 7–10 days during growing season, reduce in winter
Water thoroughly but infrequently; ensure proper drainage; adjust based on season and weather.
Soil
well-drained, loamy soil with moderate organic content
pH: Acidic to neutral (pH 5.5–7.0).
Ensure good drainage to prevent root rot; amend with organic matter for fertility; avoid heavy clay soils.
Temperature
Hardy in USDA zones 3–7; tolerates cold temperatures down to -30°F (-34°C); prefers cool summers.
Protect from late frosts; avoid placing near heat sources; monitor temperature extremes.
Fertilizing
every 4–6 weeks during spring and summer
Fertilize only when actively growing; dilute liquid fertilizer to half strength; stop fertilizing in fall.
Propagation
Methods
Seed propagation is most common; softwood cuttings can also be used.
Step-by-Step Propagation Guide
- Take cuttings in spring.
- Apply rooting hormone.
- Plant in medium.
- Maintain humidity.
- Transplant when rooted.
Best Time: Spring or early summer for cuttings; fall for seeds after fruit ripening.
Environment
Warm, humid conditions with indirect light for cuttings; consistent moisture for seeds.
Medium
Well-draining potting mix with perlite or sand for cuttings; sterile seed starting mix for seeds.
Hormone
Rooting hormone is optional but recommended for cuttings.
Timeline
Cuttings may root in 4–8 weeks; seeds can take several months to germinate and establish.
Tools Needed
Pruners, rooting hormone, pots, misting spray bottle, plastic wrap.
Quick Tips
Use fresh seeds for best germination; keep cuttings out of direct sun; maintain consistent moisture.
Pruning & Repotting
Pruning Guide
Method
Thinning cuts to open the canopy; heading cuts to shape branches.
Pruning Plan
Prune to maintain shape, remove dead wood, and encourage air circulation.
Tools
Pruning shears, loppers, saw for larger branches.
Checklist
Sterilize tools; remove dead or diseased wood; thin crowded areas; shape as needed.
Repotting Guide
Best Season
Early spring before active growth starts.
Pot Size
Increase pot size by 2–3 inches in diameter.
Method
Remove plant gently; trim roots if necessary; repot in fresh soil with good drainage; water lightly.
Suggestions
Repot only if the plant becomes root-bound or outgrows its container; typically every 2–3 years.
Checklist
Check root boundness; prepare new pot; trim roots; 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 early in the day to minimize 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 compost or peat moss for organic matter; mix in perlite or sand for drainage.
Temperature Stress Management
Signs of Temperature Issues
Leaf scorch in excessive heat; dieback in prolonged cold without protection.
Cold Stress
Leaves may turn brown or drop; growth may slow or stop; roots can freeze in poorly insulated soil.
Solution: Mulch heavily around the base; protect from harsh winds; avoid overwatering in cold weather.
Hot Stress
Wilting, leaf scorch, or premature leaf drop; reduced flowering or fruiting.
Solution: Provide shade during peak heat; increase watering; use mulch to retain soil moisture.
Fertilizing Guide
Fertilizing Checklist
Check growth stage; use appropriate fertilizer; apply sparingly; avoid late-season feeding.
Fertilizing Method
Use a balanced, slow-release fertilizer in early spring; avoid over-fertilizing, especially in late summer.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicSorbus americana berries are slightly toxic to cats if ingested. The tannins present in the berries can cause mild gastrointestinal upset, leading to discomfort. The physiological impact is typically limited to temporary symptoms.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicThe berries of Sorbus americana can be slightly toxic to dogs if ingested. The high tannin content may cause mild gastrointestinal irritation, leading to discomfort. The physiological impact is generally not severe but can cause temporary distress.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Non-toxicSorbus americana, commonly known as American mountain-ash, is generally considered non-toxic to humans. However, consuming large quantities of its berries may cause mild gastrointestinal discomfort due to their high tannin content. The physiological impact is typically limited to temporary digestive upset.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten in large quantities
Frequently Asked Questions
Q: Are the berries of Sorbus americana edible?
A: The berries are mildly toxic to humans but can be processed into jams or jellies after cooking.
Q: Does Sorbus americana attract wildlife?
A: Yes, it attracts birds, bees, and butterflies with its flowers and berries.
Q: How tall does Sorbus americana grow?
A: It typically grows to 15–25 feet in height.
Quick Reference
| Family: | Rosaceae |
| Care: | moderate |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during growi |
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