Getting it to bloom

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

Also called Grand Fir, Giant Fir, Lowland White Fir, Vancouver Fir (Abies grandis).

More about grand fir

About Grand Fir

Abies grandis · also called Grand Fir, Giant Fir · flowering

Grand Fir is one of the fastest-growing and tallest of all true firs, native to the Pacific Northwest coast and interior valleys. Its flat, glossy dark-green needles emit a distinctive citrus-like fragrance when crushed. It adapts to lowland climates better than most Abies species and is widely used in UK forestry, Christmas tree production, and as a large landscape specimen.

Plant type: flowering

The reasons grand fir isn't blooming

Almost every non-blooming grand 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 grand 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 grand fir to flower

Maximise sun. Give grand 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 grand fir and get the feeding right with the grand 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

Grand 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 grand fir care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Grand Fir blooming — frequently asked questions

Why won't my grand fir flower?

Grand 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 grand fir bloom?

Give grand 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 grand fir normally bloom?