Getting it to bloom

Why won't my Silver Shamrock bloom? (and how to make it flower)

Also called Silver Shamrock, Chilean Oxalis, Pink Oxalis (Oxalis adenophylla).

More about silver shamrock

About Silver Shamrock

Oxalis adenophylla · also called Silver Shamrock, Chilean Oxalis · flowering

Oxalis adenophylla is a compact, bulbous perennial native to the rocky screes and grasslands of the Chilean and Argentinian Andes, where it experiences cold winters and dry summers. It forms attractive clumps of silvery-grey, fan-shaped leaves made up of up to 22 small leaflets, and bears cup-shaped lilac-pink flowers in late spring. The most important care fact is excellent drainage: the whiskery corms will rot quickly in heavy, waterlogged soil, especially over winter. This plant is toxic to cats and dogs.

Plant type: flowering

The reasons silver shamrock isn't blooming

Almost every non-blooming silver 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 silver 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 silver shamrock to flower

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

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

Silver Shamrock blooming — frequently asked questions

Why won't my silver shamrock flower?

Silver 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 silver shamrock bloom?

Give silver 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 silver shamrock normally bloom?