Getting it to bloom

Why won't my Italian aster bloom? (and how to make it flower)

Also called Italian aster, European Michaelmas daisy, Amellus aster (Aster amellus).

More about italian aster

About Italian aster

Aster amellus · also called Italian aster, European Michaelmas daisy · flowering

Italian aster is a stout, drought-tolerant herbaceous perennial native to dry meadows and scrub from southern Europe to western Asia. It produces large, lavender-violet daisy flowers with golden-yellow centres from late summer into autumn. Unlike most Symphyotrichum asters, it thrives on alkaline, well-drained soils and has excellent resistance to powdery mildew, making it a reliable and low-maintenance border plant.

Plant type: flowering

Watch for — Transplant shock and slow establishment: Italian aster dislikes root disturbance. Plant young pot-grown specimens in spring with minimal root disruption; avoid moving established plants. Flowering may be sparse in the first year.

The reasons italian aster isn't blooming

Almost every non-blooming italian aster 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 italian aster 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 italian aster to flower

Maximise sun. Give italian aster 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 italian aster and get the feeding right with the italian aster 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

Italian aster 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 italian aster care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Italian aster blooming — frequently asked questions

Why won't my italian aster flower?

Italian aster 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 italian aster bloom?

Give italian aster 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 italian aster normally bloom?