Getting it to bloom

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

Also called Koreanspice Viburnum (Viburnum carlesii).

More about korean spice viburnum

About Korean Spice Viburnum

Viburnum carlesii · also called Koreanspice Viburnum · flowering

Korean Spice Viburnum is a rounded, slow-growing deciduous shrub famed for intensely clove-scented spring flowers that open from pink-red buds into domed white clusters. Its dull green, slightly fuzzy leaves often flush wine-red in autumn. Easy and adaptable, it suits full sun to part shade in any moist, well-drained, fertile soil, rewarding gardeners with one of the most fragrant blooms in spring.

Plant type: flowering

Watch for — Aphids on new growth: Clustering aphids distort tender shoots and flower buds. Blast off with water or tolerate, as predators usually restore balance; treat only heavy infestations.

The reasons korean spice viburnum isn't blooming

Almost every non-blooming korean spice viburnum 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 spice viburnum 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 spice viburnum to flower

Maximise sun. Give korean spice viburnum 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 spice viburnum and get the feeding right with the korean spice viburnum 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 Spice Viburnum 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 spice viburnum care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Korean Spice Viburnum blooming — frequently asked questions

Why won't my korean spice viburnum flower?

Korean Spice Viburnum 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 spice viburnum bloom?

Give korean spice viburnum 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 spice viburnum normally bloom?