Getting it to bloom

Why won't my Blue Bird Rose of Sharon bloom? (and how to make it flower)

Also called Blue Bird rose of Sharon, Blue Bird shrub althea, Blue Bird hardy hibiscus (Hibiscus syriacus 'Blue Bird').

More about blue bird rose of sharon

About Blue Bird Rose of Sharon

Hibiscus syriacus 'Blue Bird' · also called Blue Bird rose of Sharon, Blue Bird shrub althea · flowering

Hibiscus syriacus 'Blue Bird' is a classic cultivar of rose of Sharon renowned for its large, single, lavender-blue flowers with a contrasting deep red-purple eye, borne prolifically from late July through September. It shares the species' reliability, upright habit, and cold hardiness to USDA Zone 5, making it one of the most popular late-summer flowering shrubs in temperate gardens.

Plant type: flowering

Watch for — Japanese beetles: Beetles skeletonize the large flowers and foliage during summer; hand-pick at dawn and use neem oil or pyrethrin-based sprays as a deterrent — avoid beetle traps near the plant.

The reasons blue bird rose of sharon isn't blooming

Almost every non-blooming blue bird rose of sharon traces back to one of these, roughly in order of how common they are:

Pruned at the wrong time or too hard, removing the wood the flowers would have come from.
The plant is still too young or was cut back hard and is rebuilding rather than flowering.
Too little sun — most flowering shrubs need several hours of direct light to bloom well.
Excess nitrogen (often from lawn feed nearby) pushing leafy growth over flowers.
Drought or root stress at the bud-forming time, so buds abort.

Pruning blue bird rose of sharon at the wrong time and cutting off the wood that carries the flowers — the most common reason a healthy shrub never blooms.

The fix — how to get blue bird rose of sharon to flower

Prune at the correct time. Find out whether blue bird rose of sharon flowers on old or new wood, then prune only at the time that does not remove the flowering wood.
Protect the buds. Avoid hard cuts and protect developing buds from late frost and drought stress.
Give it sun and the right feed. Site it in good light and use a balanced or higher-potassium feed — not a high-nitrogen one — to favour flowers.
Let it mature. Give a young or hard-pruned plant a year or two to build flowering wood before expecting a full display.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for blue bird rose of sharon and get the feeding right with the blue bird rose of sharon 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

Blue Bird Rose of Sharon flowers in its established season — typically late spring through summer for a mature, correctly pruned plant — with the display improving year on year once it settles.

Post-bloom care so it flowers again

Deadhead (or leave seed heads where they protect buds), feed after flowering, and time any pruning to the plant's wood type so next year's flowers are not cut away.

For everything else this plant needs day to day, see the full blue bird rose of sharon care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Blue Bird Rose of Sharon blooming — frequently asked questions

Why won't my blue bird rose of sharon flower?

Blue Bird Rose of Sharon flowers on growth from a particular season — getting blooms depends on the plant being mature and on pruning at the RIGHT time so you don't remove the flowering wood. The most common reason it is not happening: Pruned at the wrong time or too hard, removing the wood the flowers would have come from.

How do I make blue bird rose of sharon bloom?

Find out whether blue bird rose of sharon flowers on old or new wood, then prune only at the time that does not remove the flowering wood. Avoid hard cuts and protect developing buds from late frost and drought stress.

When does blue bird rose of sharon normally bloom?