Getting it to bloom

Why won't my Sulphur Clover bloom? (and how to make it flower)

Also called Sulphur Clover, Cream Clover, Pale-yellow Clover (Trifolium ochroleucon).

More about sulphur clover

About Sulphur Clover

Trifolium ochroleucon · also called Sulphur Clover, Cream Clover · flowering

Trifolium ochroleucon is a clump-forming perennial clover native to Europe and western Asia, grown as an ornamental for its rounded heads of cream to pale-sulphur-yellow flowers held above trifoliate leaves from early to midsummer. It thrives in full sun to dappled shade in well-drained, chalky or loamy soil of moderate fertility, and is particularly suited to dry meadow and pollinator garden schemes. The most important care fact is that it resents heavy, waterlogged soil, which causes root rot and crown death over winter. Trifolium ochroleucon is considered non-toxic to cats and dogs.

Plant type: flowering

The reasons sulphur clover isn't blooming

Almost every non-blooming sulphur clover 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 sulphur clover 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 sulphur clover to flower

Maximise sun. Give sulphur clover 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 sulphur clover and get the feeding right with the sulphur clover 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

Sulphur Clover 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 sulphur clover care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Sulphur Clover blooming — frequently asked questions

Why won't my sulphur clover flower?

Sulphur Clover 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 sulphur clover bloom?

Give sulphur clover 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 sulphur clover normally bloom?