White Fir
Abies concolor · California White Fir · Colorado Fir · Low's Fir · Rocky Mountain White Fir · Balsam Fir · White Silver Fir · Concolor FirUSDA | Grow Zone
3-7Outdoors all year in zones 3 to 7. Anywhere colder, keep it as a houseplant.
- Light
- Full sun to partial shade
- Water
- Deeply but infrequently
- Humidity
- 40-60%
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Intermediate
- Growth
- Slow
- Mature size
- 50-70 ft tall
- Pets
- Non-toxic to pets
Abies concolor, commonly known as White Fir, is a majestic evergreen tree native to western North America. Its soft, blue-green needles and conical shape make it a popular choice for landscapes and reforestation efforts.
Ask Vesper about White Fir
Ideal temperature
60-75°F is where it grows fastest.
Spacing and harvest
- Mature size
- 50-70 ft tall
- Plant apart
- 240-360 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Abies concolor prefers well-drained soil and should be watered deeply but infrequently.
During the growing season, water every 2-3 weeks, adjusting frequency based on rainfall. In winter, reduce watering significantly. Signs of over-watering include yellowing needles and root rot, while under-watering can cause needle drop and browning tips.
Light
This tree thrives in full sun to partial shade, ideally receiving at least 6 hours of direct sunlight daily.
It can tolerate some shade but may grow slowly in low light conditions. For optimal growth, place it in a location with morning sun and afternoon shade in hotter climates.
Soil
The ideal soil for Abies concolor is sandy loam or loamy soil with a pH range of 5.5 to 7.0.
It requires excellent drainage to prevent root rot, so consider using a potting mix designed for conifers or adding perlite to improve drainage.
Humidity
Abies concolor prefers moderate humidity levels, ideally between 40-60%.
To increase humidity, mist the foliage or place a humidifier nearby. Signs of low humidity stress include browning needle tips and needle drop.
Temperature
This fir tree thrives in temperatures between 60-75°F (15-24°C) and is hardy in USDA zones 3-7.
It can tolerate cold temperatures down to -30°F (-34°C) but may struggle in extreme heat above 90°F (32°C).
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or 20-20-20, applying it in early spring as new growth begins.
Fertilize every 4-6 weeks during the growing season. Signs of nutrient deficiency include yellowing needles and stunted growth.
Pruning
Prune Abies concolor in late winter or early spring before new growth begins.
Use sharp, clean pruning shears to remove dead or damaged branches and to shape the tree. Avoid heavy pruning, as this can stress the tree, and deadhead any spent flowers if applicable.
Repotting
Repot Abies concolor every 2-3 years or when the roots become pot-bound.
Choose a pot that is 1-2 inches larger in diameter than the current one. Signs it needs repotting include roots growing out of the drainage holes and slowed growth. To repot, gently remove the tree from its pot, loosen the roots, and place it in fresh soil.
Propagation
Abies concolor can be propagated by seeds or cuttings.
For seeds, collect them in late summer, stratify for 30 days, and plant in spring. For cuttings, take 4-6 inch stem cuttings in early summer, dip in rooting hormone, and place in a well-draining medium. Keep moist until roots develop, which may take several weeks.
When it's unhappy
Yellowing needles
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and reduce watering if necessary. Fertilize with a balanced fertilizer to address nutrient issues.
Browning needle tips
Why it happens
Low humidity or under-watering can lead to this issue.
How to fix it
Increase humidity around the plant and ensure consistent watering, especially during dry spells.
Root rot
Why it happens
Over-watering or poorly draining soil can cause root rot.
How to fix it
Ensure proper drainage and reduce watering frequency. If root rot is present, consider repotting with fresh soil.
Pests (e.g., aphids, spider mites)
Why it happens
Pests can infest the tree, particularly in dry conditions.
How to fix it
Inspect regularly and treat with insecticidal soap or neem oil as needed.
Needle drop
Why it happens
Environmental stress, such as rapid temperature changes or drought.
How to fix it
Maintain consistent care and monitor environmental conditions to reduce stress.
Care through the year
Spring
In spring, apply a balanced fertilizer as new growth begins. Monitor for pests and prune any dead branches.
Summer
Water deeply every 2-3 weeks, especially during dry spells. Keep an eye on humidity levels and mist if necessary.
Fall
Reduce watering as the tree enters dormancy. Prepare for winter by mulching around the base to protect the roots.
Winter
Limit watering during winter months, ensuring the soil remains slightly moist but not soggy. Protect the tree from harsh winds and extreme cold.
Toxicity & Safety
Abies concolor is non-toxic to pets and children. However, ingestion of large quantities of any plant material may cause mild gastrointestinal upset.
Good to know
Why are my Abies concolor leaves turning yellow?
Yellowing leaves on your White Fir can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if needed.
How often should I water my Abies concolor?
Water your White Fir deeply every 2-3 weeks during the growing season, adjusting based on rainfall. Reduce watering in winter.
What type of soil is best for Abies concolor?
Abies concolor thrives in sandy loam or loamy soil with a pH of 5.5 to 7.0. Ensure the soil has excellent drainage to prevent root rot.
How can I increase humidity for my Abies concolor?
You can increase humidity by misting the foliage regularly or placing a humidifier nearby. This helps prevent browning needle tips.
When is the best time to prune Abies concolor?
Prune your White Fir in late winter or early spring before new growth begins. This helps maintain its shape and remove any dead branches.
How can I propagate Abies concolor?
You can propagate White Fir by seeds or cuttings. Collect seeds in late summer and stratify them, or take stem cuttings in early summer.
What are common pests that affect Abies concolor?
Common pests include aphids and spider mites, especially in dry conditions. Regular inspection and treatment with insecticidal soap can help manage them.
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