Oregon Ash
fraxinus latifolia
Also known as: ["Oregon Ash","Broadleaf Ash"]
Overview
A deciduous tree native to the Pacific Northwest, known for its broad leaves and attractive form.
Benefits & Perks
["shade tolerant","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Lamiales |
| Family: | Oleaceae |
| Genus: | Fraxinus |
| Botanical Name: | Fraxinus latifolia |
Plant Characteristics
Basic Information
- Category: Trees
- Suitable Location: outdoor garden in a spacious area with room for growth
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–35°C"}
- Hardiness: {"zones":"7–10"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogging; avoid heavy clay soils without amendments.
- Soil Type: Well-draining, loamy soil with organic matter; tolerates sandy or clay soils if amended for drainage.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: Annually in late winter or early spring before new growth begins; light pruning can be done as needed throughout the year.
- Pruning Intensity: Moderate; remove up to one-third of old growth if necessary, but avoid heavy pruning on mature trees
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 gradually if moving from shade to sun; protect from intense midday sun to prevent leaf scorch; adjust placement based on seasonal light changes.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
full sun to partial shade
Monitor leaf color for signs of sunburn; provide dappled shade during peak summer; rotate the plant for even light exposure.
Watering
every 7–10 days during active growth, less frequently in winter
Water thoroughly until it drains from the bottom; allow soil to dry between waterings; avoid overwatering, especially in winter.
Soil
well-drained, loamy soil with moderate organic content
pH: Slightly acidic to neutral (pH 6.0–7.0); adaptable to a range of soil pH levels.
Ensure good drainage; amend heavy soils with organic matter; test pH if growth issues arise.
Temperature
Hardy in USDA zones 7–10; prefers temperatures between 60–75°F (15–24°C); tolerates mild frosts but may suffer in extreme heat.
Monitor temperature extremes; adjust watering in response to heat; protect from frost in colder regions.
Fertilizing
every 4–6 weeks during spring and summer, none in fall and winter
Avoid over-fertilizing, which can burn roots; fertilize only when actively growing; water before applying fertilizer to prevent root damage.
Propagation
Methods
Softwood cuttings taken in late spring or early summer; seeds can also be sown in fall or spring after cold stratification.
Step-by-Step Propagation Guide
- Take 4–6 inch cuttings.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in moist medium.
- Keep humid and warm.
Best Time: Late spring to early summer for cuttings; fall or spring for seeds after stratification.
Environment
Warm, humid environment with indirect light; maintain consistent moisture until roots develop.
Medium
Well-draining potting mix with perlite or sand; rooting hormone can improve success rates.
Hormone
Recommended for cuttings to encourage root development.
Timeline
Cuttings may root in 4–8 weeks; seed germination can take several weeks to months.
Tools Needed
Pruning shears, rooting hormone, small pots, misting spray bottle, plastic bags for humidity.
Quick Tips
Use healthy, disease-free cuttings; maintain high humidity; avoid direct sunlight during rooting.
Pruning & Repotting
Pruning Guide
Method
Use clean cuts just above a bud or branch junction; remove crossing or rubbing branches; thin out dense growth to improve light penetration.
Pruning Plan
Prune to maintain shape, remove dead or diseased wood, and encourage healthy growth; focus on structural improvement and air circulation.
Tools
Pruning shears, loppers, saw (for larger branches), disinfectant for tools.
Checklist
Disinfect tools; prune during dormancy; remove dead/diseased wood; make clean cuts; avoid over-pruning.
Repotting Guide
Best Season
Early spring before active growth begins; avoid repotting during extreme heat or cold.
Pot Size
Increase pot size by 2–3 inches in diameter; ensure the new pot has drainage holes.
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 container-grown plants every 2–3 years or when roots fill the pot; outdoor trees generally do not require repotting.
Checklist
Choose appropriate pot size; prepare fresh soil mix; trim roots if needed; water after repotting; place in appropriate light.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water deeply; ensure proper drainage; adjust frequency seasonally.
How to Apply Water Properly
Water at the base of the plant, ensuring moisture reaches the root zone; water early in the morning to minimize evaporation; ensure excess water drains away to prevent waterlogging.
Watering Schedule Tips
Water deeply once the top 1–2 inches of soil are dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add compost or organic matter to improve structure; incorporate perlite or sand for drainage; avoid compacted soil.
Temperature Stress Management
Signs of Temperature Issues
Leaf scorch or wilting in excessive heat; leaf drop or dieback in prolonged cold; stunted growth in temperature stress.
Cold Stress
Low temperatures can cause leaf drop, slowed growth, and potential dieback of young shoots; may enter dormancy in colder climates.
Solution: Mulch around the base to insulate roots; protect from harsh winds; move container-grown plants to a sheltered location if temperatures drop below freezing.
Hot Stress
Excessive heat can lead to leaf scorch, wilting, and reduced vigor; may require more frequent watering in hot, dry conditions.
Solution: Provide afternoon shade; increase watering frequency; use mulch to retain soil moisture; ensure good air circulation.
Fertilizing Guide
Fertilizing Checklist
Use balanced fertilizer; apply in spring; dilute liquid fertilizers; stop in winter.
Fertilizing Method
Use a balanced, slow-release fertilizer in early spring; apply a diluted liquid fertilizer monthly during the growing season; reduce or stop fertilizing in fall and winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicCats may experience mild gastrointestinal symptoms if they ingest parts of Fraxinus latifolia. The plant is not highly toxic to cats, but caution is advised to prevent ingestion.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicIn dogs, ingestion of Fraxinus latifolia seeds or leaves can lead to mild gastrointestinal upset. The toxicity is generally low, but symptoms may occur if large amounts are consumed.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicFraxinus latifolia, commonly known as Oregon ash, contains compounds that can cause mild gastrointestinal distress if ingested in significant quantities. The toxic effects are generally not severe but can be problematic for sensitive individuals.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Fraxinus latifolia suitable for urban planting?
A: Yes, it can thrive in urban environments if planted in well-drained soil and given adequate space.
Q: Does Oregon Ash require regular pruning?
A: Pruning is recommended to maintain shape and remove deadwood, but it is not overly demanding.
Q: What are the primary uses of Oregon Ash?
A: It is valued for its timber, ornamental landscaping, and ecological benefits.
Quick Reference
| Family: | Oleaceae |
| Care: | moderate |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
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