Getting it to bloom

Why won't my Black Medick bloom? (and how to make it flower)

Also called Black Medick, Black Medic, Hop Clover, Nonesuch, Yellow Trefoil (Medicago lupulina).

More about black medick

About Black Medick

Medicago lupulina · also called Black Medick, Black Medic · flowering

Medicago lupulina is a low-growing annual or short-lived perennial legume native to grasslands, roadsides, and disturbed ground across Europe, Asia, and northern Africa, widely naturalised in North America and Australasia. It thrives in full sun on poor to moderately fertile, well-drained soils and, as a legume, fixes atmospheric nitrogen through root nodules — so avoid nitrogen-rich fertilisers. The tiny yellow clover-like flowers turn into distinctive black coiled seed pods that give the plant its common name. It is not considered toxic to cats or dogs.

Plant type: flowering

Watch for — Aphid infestation: Black bean aphid (Aphis fabae) and pea aphid (Acyrthosiphon pisum) can colonise soft new growth; natural predators usually control populations in wildflower settings — intervene with insecticidal soap only on serious infestations.

The reasons black medick isn't blooming

Almost every non-blooming black medick 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 black medick 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 black medick to flower

Maximise sun. Give black medick 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 black medick and get the feeding right with the black medick 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

Black Medick 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 black medick care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Black Medick blooming — frequently asked questions

Why won't my black medick flower?

Black Medick 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 black medick bloom?

Give black medick 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 black medick normally bloom?