Getting it to bloom

Why won't my Purple Saxifrage bloom? (and how to make it flower)

Also called Purple Saxifrage, Purple Mountain Saxifrage (Saxifraga oppositifolia).

More about purple saxifrage

About Purple Saxifrage

Saxifraga oppositifolia · also called Purple Saxifrage, Purple Mountain Saxifrage · flowering

Saxifraga oppositifolia is one of the world's most northerly flowering plants, native to arctic and high-alpine zones across Europe, North America, and Asia, typically growing in rock crevices and scree on calcareous substrates. It forms dense, prostrate mats of tiny paired leaves that are smothered in purple to magenta flowers as early as February in mild sites. The key care requirement is outstanding drainage combined with a cool root run — it dislikes summer heat and must not sit in wet soil. Saxifraga species are considered non-toxic to cats and dogs.

Plant type: flowering

The reasons purple saxifrage isn't blooming

Almost every non-blooming purple saxifrage 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 purple saxifrage 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 purple saxifrage to flower

Maximise sun. Give purple saxifrage 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 purple saxifrage and get the feeding right with the purple saxifrage 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

Purple Saxifrage 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 purple saxifrage care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Purple Saxifrage blooming — frequently asked questions

Why won't my purple saxifrage flower?

Purple Saxifrage 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 purple saxifrage bloom?

Give purple saxifrage 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 purple saxifrage normally bloom?