Douglas fir.

En un coup d'œil

Niveau d'entretien

Facile

Type de plante

Conifer

Lumière

Full sun

Lumière en intérieur

Soleil direct

Arrosage

Tous les 7 à 14 jours

Taille adulte

200 feet

Croissance

Moyenne

Rusticité

USDA 4 à 7

Floraison

Mid to late spring

Entretien

Plant this tree in a spot with plenty of space for its eventual size. Keep an eye out for needle drop or yellowing which might suggest poor drainage. It is quite hardy once established in the ground.

Arrosage

Water deeply during the first few years until the root system is well established.

Engrais

Apply a balanced fertilizer once in early spring to support healthy growth.

Taille

Remove dead or damaged branches in late winter while the tree is dormant.

Rempotage

This tree is not suitable for container growth long term.

Sol

Well drained acidic soil

pH du sol

5.0 to 6.0

Température

-35 à 35°C

Humidité

40 à 80%

Résistance à la sécheresse

Moyenne

Durée de vie

Long lived, often 500 plus years

Parfum

Léger

Résistance aux chevreuils et lapins

Moyenne

Sécurité

Humains

The plant is generally non toxic, though ingestion of large quantities of needles may cause mild digestive upset.

Enfants

The sharp needles can poke small children, so keep them away from low hanging branches.

Allergènes de contact

Handling the needles may cause mild skin irritation in sensitive individuals.

Allergènes aéroportés

The pollen is a common airborne allergen during the spring release period.

Comestibilité

The needles are sometimes used for tea, but ensure you have correctly identified the species as some conifers are toxic.

Comment l'identifier

• Soft needles with two white underside bands
• Cones have distinct three pointed bracts
• Dark gray bark with deep fissures
• Pyramidal shape when young

Hauteur

20 à 70m

Envergure

6 à 10m

Feuilles

dark green, blue green, evergreen

Fleurs

yellow, red, 1 à 3cm

Fruits

brown, Autumn

Problèmes courants

• Swiss needle cast — A fungal infection that causes yellowing and premature dropping of needles.
• Douglas fir beetle — A bark beetle that can cause significant damage to stressed or weakened trees.

La cultiver

Multiplication

seed

Quand planter

Spring, Autumn

Hivernage

No special winter care is required as it is fully hardy in its native range.

En pot

It is not suitable for long term container growth due to its massive size.

Plant shade tolerant shrubs underneath to take advantage of the dappled light provided by the canopy.

Bonnes associations

• Cèdre rouge de l'Ouest — They often grow together in native forest ecosystems.
• Gaultheria shallon — This shrub thrives in the acidic soil conditions found beneath these trees.

Espèces similaires

• Tsuga heterophylla — It shares a similar native range and forest habitat.

Science

Famille

Pinaceae

Genre

Pseudotsuga

Ordre

Pinales

Classe

Pinopsida

Région d'origine

Western North America

Préservation

This species is widely distributed and not currently of conservation concern.

It thrives in cool, moist climates and often dominates forests by outcompeting other species for light.

Intérêt pour la faune

nesting site, seed source for birds, larval host plant

Pollinisateurs

abeilles

Utilisations

timber production, ornamental specimen, windbreak, christmas tree

Taxonomie vérifiée avec le GBIF.

Ce qu'on demande souvent

How fast does it grow?

It grows moderately fast, often adding 30 to 60 centimeters per year in good conditions.

Can I grow this in a small yard?

It is generally too large for small residential gardens and is better suited for large landscapes.

D'où vient le nom

The genus name Pseudotsuga means false hemlock, while the species epithet honors the Scottish botanist Archibald Menzies.

Bon à savoir

• It is one of the tallest tree species in the world.
• The cones have unique three pointed bracts sticking out from under the scales.
• It is the state tree of Oregon.
• The wood is highly valued for construction due to its strength.
• It can live for over 500 years in ideal conditions.