Getting it to bloom

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

Also called Egyptian star flower, Egyptian star cluster, Star cluster, Pentas (Pentas lanceolata).

More about egyptian star flower

About Egyptian Star Flower

Pentas lanceolata · also called Egyptian star flower, Egyptian star cluster · flowering

Egyptian star flower (Pentas lanceolata) is a heat-loving Rubiaceae shrub grown for non-stop clusters of star-shaped pink, red, lilac or white blooms that draw butterflies and hummingbirds. It thrives in full sun, well-drained soil and warm temperatures. Not individually listed by the ASPCA, so treat as mildly toxic and verify with a vet.

Plant type: flowering

Watch for — Aphids and whiteflies: Cluster on tender new growth and flower buds, secreting sticky honeydew. Whiteflies are particularly troublesome indoors; knock back with water, insecticidal soap or neem.

The reasons egyptian star flower isn't blooming

Almost every non-blooming egyptian star flower 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 egyptian star flower 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 egyptian star flower to flower

Maximise sun. Give egyptian star flower 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 egyptian star flower and get the feeding right with the egyptian star flower 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

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

Egyptian Star Flower blooming — frequently asked questions

Why won't my egyptian star flower flower?

Egyptian Star Flower 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 egyptian star flower bloom?

Give egyptian star flower 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 egyptian star flower normally bloom?