Getting it to bloom

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

Also called Japanese pieris, lily-of-the-valley shrub, andromeda (Pieris japonica).

More about japanese pieris

About Japanese Pieris

Pieris japonica · also called Japanese pieris, lily-of-the-valley shrub · flowering

Japanese pieris is a compact evergreen shrub grown for bronze-red new growth and drooping panicles of urn-shaped, lily-of-the-valley-like flowers in early spring. It needs moist, acidic, well-drained soil and dappled shade with shelter from cold wind. Slow-growing and tidy, every part is poisonous, so site it away from grazing pets and children.

Plant type: flowering

The reasons japanese pieris isn't blooming

Almost every non-blooming japanese pieris 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 japanese pieris 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 japanese pieris to flower

Maximise sun. Give japanese pieris 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 japanese pieris and get the feeding right with the japanese pieris 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

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

Japanese Pieris blooming — frequently asked questions

Why won't my japanese pieris flower?

Japanese Pieris 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 japanese pieris bloom?

Give japanese pieris 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 japanese pieris normally bloom?