Getting it to bloom

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

Also called Gentian sage, Spreading sage (Salvia patens).

More about gentian sage

About Gentian Sage

Salvia patens · also called Gentian sage, Spreading sage · flowering

Salvia patens is a tuberous-rooted herbaceous perennial native to the highlands of central Mexico, celebrated for its exceptionally large (up to 5 cm), hooded flowers in the most vivid gentian-blue of any sage species. In frost-prone gardens it is grown as a half-hardy perennial — tubers can be lifted and stored dry like dahlias, or the plant treated as a tender perennial in a frost-free greenhouse. Full sun and well-drained, humus-rich soil are the key requirements; the most important care fact is to lift tubers before frost in Zones 7 and below, or provide a deep dry mulch in borderline areas. According to the ASPCA, sage (Salvia spp.) is listed as non-toxic to cats, dogs, and horses.

Plant type: flowering

The reasons gentian sage isn't blooming

Almost every non-blooming gentian 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 gentian 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 gentian sage to flower

Maximise sun. Give gentian 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 gentian sage and get the feeding right with the gentian 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

Gentian 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 gentian sage care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Gentian Sage blooming — frequently asked questions

Why won't my gentian sage flower?

Gentian 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 gentian sage bloom?

Give gentian 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 gentian sage normally bloom?