Getting it to bloom

Why won't my Oxalis tetraphylla bloom? (and how to make it flower)

Also called four-leaf sorrel, iron cross plant, lucky clover (Oxalis tetraphylla).

More about oxalis tetraphylla

About Oxalis tetraphylla

Oxalis tetraphylla · also called four-leaf sorrel, iron cross plant · flowering

Oxalis tetraphylla is a bulbous wood sorrel grown for its distinctive four-leaflet clover leaves, each marked with a dark purple 'iron cross' band, topped by clusters of small rose-pink flowers in summer. The leaves fold at night and in bright sun. A tender perennial from Mexico, it grows from small bulbs and goes dormant after flowering or in cold conditions.

Plant type: flowering

Watch for — Sudden die-back / dormancy: Not death but normal dormancy after flowering or in heat. Cut back, keep bulbs cool and nearly dry, and growth resumes next season.

The reasons oxalis tetraphylla isn't blooming

Almost every non-blooming oxalis tetraphylla 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 oxalis tetraphylla 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 oxalis tetraphylla to flower

Maximise sun. Give oxalis tetraphylla 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 oxalis tetraphylla and get the feeding right with the oxalis tetraphylla 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

Oxalis tetraphylla 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 oxalis tetraphylla care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Oxalis tetraphylla blooming — frequently asked questions

Why won't my oxalis tetraphylla flower?

Oxalis tetraphylla 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 oxalis tetraphylla bloom?

Give oxalis tetraphylla 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 oxalis tetraphylla normally bloom?