Getting it to bloom

Why won't my Hooker's Inula bloom? (and how to make it flower)

Also called Hooker's Inula, Hooker Inula (Inula hookeri).

More about hooker's inula

About Hooker's Inula

Inula hookeri · also called Hooker's Inula, Hooker Inula · flowering

Hooker's Inula is a vigorous, spreading herbaceous perennial from the Himalayas, valued for its abundant pale yellow daisy flowers with very fine, almost thread-like ray petals giving a shaggy, elegant appearance. It forms spreading colonies in moist, fertile borders, blooming prolifically from late summer into autumn and attracting numerous pollinators.

Plant type: flowering

Watch for — Aphid colonies on flower buds: Aphids commonly colonise the flower stem tips and buds. Blast off with water or treat with insecticidal soap. The plant's spreading habit means a few aphids pose little long-term threat.

The reasons hooker's inula isn't blooming

Almost every non-blooming hooker's inula 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 hooker's inula 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 hooker's inula to flower

Maximise sun. Give hooker's inula 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 hooker's inula and get the feeding right with the hooker's inula 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

Hooker's Inula 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 hooker's inula care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Hooker's Inula blooming — frequently asked questions

Why won't my hooker's inula flower?

Hooker's Inula 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 hooker's inula bloom?

Give hooker's inula 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 hooker's inula normally bloom?