Getting it to bloom

Why won't my Coral Bark Maple bloom? (and how to make it flower)

Also called Coral Bark Japanese Maple, Sango Kaku Maple (Acer palmatum 'Sango-kaku').

More about coral bark maple

About Coral Bark Maple

Acer palmatum 'Sango-kaku' · also called Coral Bark Japanese Maple, Sango Kaku Maple · flowering

Coral Bark Maple is a spectacular Japanese maple cultivar grown primarily for its vivid coral-red young stems, which glow in winter sunlight when leaves have fallen. Spring leaves emerge bright yellow-green, turning soft gold in autumn. A year-round ornamental for borders and containers. Not toxic to pets.

Plant type: flowering

Watch for — Late frost damage: Emerging spring foliage is frost-sensitive; protect with fleece if late frost threatens after bud-break.

The reasons coral bark maple isn't blooming

Almost every non-blooming coral bark maple 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 coral bark maple 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 coral bark maple to flower

Maximise sun. Give coral bark maple 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 coral bark maple and get the feeding right with the coral bark maple 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

Coral Bark Maple 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 coral bark maple care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Coral Bark Maple blooming — frequently asked questions

Why won't my coral bark maple flower?

Coral Bark Maple 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 coral bark maple bloom?

Give coral bark maple 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 coral bark maple normally bloom?