Getting it to bloom

Why won't my Korean Hornbeam bloom? (and how to make it flower)

Also called Korean Hornbeam, Turczaninow's Hornbeam (Carpinus turczaninowii).

More about korean hornbeam

About Korean Hornbeam

Carpinus turczaninowii · also called Korean Hornbeam, Turczaninow's Hornbeam · flowering

Korean Hornbeam is a deciduous tree prized as bonsai for its small, sharply serrated leaves, fine ramification, and brilliant orange-red autumn colour. An outdoor tree, it likes full sun to light shade and consistently moist, well-drained soil. It back-buds freely and takes pruning superbly, making it one of the most rewarding deciduous bonsai subjects.

Plant type: flowering

Watch for — Long internodes from over-feeding or shade: Excess nitrogen or low light produces leggy growth with widely spaced buds. Use restrained feeding and full light, and pinch new shoots to keep ramification tight.

The reasons korean hornbeam isn't blooming

Almost every non-blooming korean hornbeam 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 korean hornbeam 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 korean hornbeam to flower

Maximise sun. Give korean hornbeam 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 korean hornbeam and get the feeding right with the korean hornbeam 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

Korean Hornbeam 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 korean hornbeam care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Korean Hornbeam blooming — frequently asked questions

Why won't my korean hornbeam flower?

Korean Hornbeam 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 korean hornbeam bloom?

Give korean hornbeam 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 korean hornbeam normally bloom?