Getting it to bloom

Why won't my Roborowsky's Sage bloom? (and how to make it flower)

Also called Roborowsky's sage (Salvia roborowskii).

More about roborowsky's sage

About Roborowsky's Sage

Salvia roborowskii · also called Roborowsky's sage · flowering

Salvia roborowskii is an annual or biennial herb native to a wide area encompassing Tibet, Sikkim, and five provinces in China, where it grows on wet stream banks, hillside grasslands, and disturbed ground at elevations of 2,400–3,600 m. It produces erect, much-branched, sticky-hairy stems to 90 cm bearing whorls of small lemon-yellow flowers. As an annual or biennial, it must be resown each season in most temperate gardens; it is not frost-hardy enough to overwinter reliably outdoors in the UK or most of North America. The ASPCA lists sage (Salvia) as non-toxic to cats and dogs.

Plant type: flowering

The reasons roborowsky's sage isn't blooming

Almost every non-blooming roborowsky's sage 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 roborowsky's sage 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 roborowsky's sage to flower

Maximise sun. Give roborowsky's sage 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 roborowsky's sage and get the feeding right with the roborowsky's sage 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

Roborowsky's Sage 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 roborowsky's sage care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Roborowsky's Sage blooming — frequently asked questions

Why won't my roborowsky's sage flower?

Roborowsky's Sage 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 roborowsky's sage bloom?

Give roborowsky's sage 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 roborowsky's sage normally bloom?