Getting it to bloom

Why won't my Star of Bethlehem bloom? (and how to make it flower)

Also called Common Star of Bethlehem, Nap-at-noon, Eleven-o'clock Lady (Ornithogalum umbellatum).

More about star of bethlehem

About Star of Bethlehem

Ornithogalum umbellatum · also called Common Star of Bethlehem, Nap-at-noon · flowering

Star of Bethlehem is a compact European and Middle Eastern Asparagaceae bulb producing clusters of bright white, star-shaped flowers with distinctive green stripes on the outer petals in spring. It naturalises easily but can become invasive. The ASPCA lists Ornithogalum as toxic to dogs, cats, and horses.

Plant type: flowering

Watch for — Invasiveness: Self-seeds prolifically and spreads via tiny bulblets; deadhead after flowering in controlled garden situations and avoid planting near natural habitats.

The reasons star of bethlehem isn't blooming

Almost every non-blooming star of bethlehem 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 star of bethlehem 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 star of bethlehem to flower

Maximise sun. Give star of bethlehem 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 star of bethlehem and get the feeding right with the star of bethlehem 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

Star of Bethlehem 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 star of bethlehem care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Star of Bethlehem blooming — frequently asked questions

Why won't my star of bethlehem flower?

Star of Bethlehem 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 star of bethlehem bloom?

Give star of bethlehem 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 star of bethlehem normally bloom?