Getting it to bloom

Why won't my Blue Douglas Fir bloom? (and how to make it flower)

Also called Rocky Mountain Douglas Fir, Blue Rocky Mountain Fir, Interior Douglas Fir (Pseudotsuga menziesii var. glauca).

More about blue douglas fir

About Blue Douglas Fir

Pseudotsuga menziesii var. glauca · also called Rocky Mountain Douglas Fir, Blue Rocky Mountain Fir · flowering

Blue Douglas Fir is the cold-hardy inland variety of Douglas Fir, bearing blue-green to grey-green needles with a pleasant fragrance. More compact and cold-tolerant than the coastal variety, it forms a broadly pyramidal specimen tree with attractive pendulous cones. Not listed as toxic by the ASPCA; low-risk to pets.

Plant type: flowering

The reasons blue douglas fir isn't blooming

Almost every non-blooming blue douglas fir traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding blue douglas fir a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get blue douglas fir to flower

Maximise sun. Give blue douglas fir the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for blue douglas fir and get the feeding right with the blue douglas fir fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Blue Douglas Fir flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full blue douglas fir care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Blue Douglas Fir blooming — frequently asked questions

Why won't my blue douglas fir flower?

Blue Douglas Fir blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make blue douglas fir bloom?

Give blue douglas fir the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does blue douglas fir normally bloom?