Getting it to bloom

Why won't my False shamrock bloom? (and how to make it flower)

Also called purple shamrock, love plant, wood sorrel (purple) (Oxalis triangularis).

About False shamrock

Oxalis triangularis · also called purple shamrock, love plant · flowering

False shamrock is a Brazilian tuberous perennial with deep purple triangular leaves that fold up at night, and small pink flowers. Easy and forgiving but mildly toxic to pets due to oxalic acid. Tubers cycle through dormancy.

Oxalis triangularis, a tuberous wood-sorrel native to Brazil, grown for its deep-purple triangular trifoliate leaves that arise from small scaly underground tubers.

Plant type: flowering

Sources: libguides.nybg.org, aspca.org

The reasons false shamrock isn't blooming

Almost every non-blooming false shamrock 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 false shamrock 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 false shamrock to flower

Maximise sun. Give false shamrock 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 false shamrock and get the feeding right with the false shamrock 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

False shamrock 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 false shamrock care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

False shamrock blooming — frequently asked questions

Why won't my false shamrock flower?

False shamrock 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 false shamrock bloom?

Give false shamrock 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 false shamrock normally bloom?