Getting it to bloom

Why won't my Many-spiked Sage bloom? (and how to make it flower)

Also called Many-spiked Sage, Fuzzy Blue Sage (Salvia polystachya).

More about many-spiked sage

About Many-spiked Sage

Salvia polystachya · also called Many-spiked Sage, Fuzzy Blue Sage · flowering

Salvia polystachya is a tall herbaceous perennial native to the high-altitude cloud forests and volcanic slopes of central Mexico south through Central America to Panama, typically at 1,500–3,000 m elevation. Its name means 'many spikes', describing the dense clusters of slender flower spikes bearing small violet-blue flowers that peak in late summer and autumn, making it a vital nectar source for migrating hummingbirds and butterflies. Full sun and sharply drained soil are the key requirements; plants can reach 2–3 m in a single growing season in warm climates. The ASPCA does not specifically list this species, but the Salvia genus is not a known toxic group; keep away from pets as a precaution.

Plant type: flowering

Watch for — Stem breakage: The brittle hollow stems are prone to snapping in wind; site plants in a sheltered spot among other vegetation or provide loose staking before flowering spikes elongate.

The reasons many-spiked sage isn't blooming

Almost every non-blooming many-spiked 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 many-spiked 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 many-spiked sage to flower

Maximise sun. Give many-spiked 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 many-spiked sage and get the feeding right with the many-spiked 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

Many-spiked 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 many-spiked sage care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Many-spiked Sage blooming — frequently asked questions

Why won't my many-spiked sage flower?

Many-spiked 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 many-spiked sage bloom?

Give many-spiked 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 many-spiked sage normally bloom?