Getting it to bloom

Why won't my Echinops ritro bloom? (and how to make it flower)

Also called small globe thistle, Southern globe thistle (Echinops ritro).

More about echinops ritro

About Echinops ritro

Echinops ritro · also called small globe thistle, Southern globe thistle · flowering

Echinops ritro is a tough, sun-loving perennial grown for its perfectly spherical, steel-blue flower heads borne on stiff, branching stems above spiny, deeply cut grey-green foliage in mid to late summer. Drought-tolerant and a magnet for bees and butterflies, it suits gravel gardens, prairie and Mediterranean-style borders, and dries beautifully for everlasting arrangements.

Plant type: flowering

Watch for — Aphids: Colonies can gather on stems and buds, distorting growth. Dislodge with a jet of water or tolerate them, as the flowers attract many natural predators.

The reasons echinops ritro isn't blooming

Almost every non-blooming echinops ritro 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 echinops ritro 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 echinops ritro to flower

Maximise sun. Give echinops ritro 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 echinops ritro and get the feeding right with the echinops ritro 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

Echinops ritro 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 echinops ritro care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Echinops ritro blooming — frequently asked questions

Why won't my echinops ritro flower?

Echinops ritro 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 echinops ritro bloom?

Give echinops ritro 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 echinops ritro normally bloom?