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Getting it to bloom

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

Also called Korean box, Korean boxwood (Buxus sinica var. insularis).

More about korean box

About Korean box

Buxus sinica var. insularis · also called Korean box, Korean boxwood · flowering

Korean box is one of the hardiest boxwoods available, tolerating temperatures as low as USDA Zone 4. It forms a compact, rounded mound of small, light green leaves that may bronze slightly in winter. Excellent for northern gardens, formal hedges, and edging where Japanese or common box are too tender.

Plant type: flowering

The reasons korean box isn't blooming

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

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

Feeding korean box 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 box to flower

  1. Maximise sun. Give korean box the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
  2. Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
  3. Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
  4. 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 box and get the feeding right with the korean box 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 box 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 box care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Korean box blooming — frequently asked questions

Why won't my korean box flower?

Korean box 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 box bloom?

Give korean box 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 box normally bloom?

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

What should I do with korean box after it flowers?

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.

What is the single biggest mistake stopping korean box flowering?

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

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