Getting it to bloom

Why won't my Purple Japanese Barberry bloom? (and how to make it flower)

Also called Purple Japanese Barberry, Red Barberry, Japanese Barberry (Berberis thunbergii f. atropurpurea).

More about purple japanese barberry

About Purple Japanese Barberry

Berberis thunbergii f. atropurpurea · also called Purple Japanese Barberry, Red Barberry · flowering

A dense, spiny deciduous shrub grown primarily for its vivid deep-red to purple foliage, which intensifies in autumn before the leaves drop to reveal bright red berries. Small yellow flowers appear in spring. Highly adaptable and drought-tolerant once established. Note: Berberis is invasive in some US states — check local regulations before planting.

Plant type: flowering

The reasons purple japanese barberry isn't blooming

Almost every non-blooming purple japanese barberry 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 purple japanese barberry 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 purple japanese barberry to flower

Maximise sun. Give purple japanese barberry 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 purple japanese barberry and get the feeding right with the purple japanese barberry 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

Purple Japanese Barberry 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 purple japanese barberry care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Purple Japanese Barberry blooming — frequently asked questions

Why won't my purple japanese barberry flower?

Purple Japanese Barberry 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 purple japanese barberry bloom?

Give purple japanese barberry 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 purple japanese barberry normally bloom?