Getting it to bloom

Why won't my May Night Salvia bloom? (and how to make it flower)

Also called May Night salvia, May Night sage (Salvia nemorosa 'Mainacht').

More about may night salvia

About May Night Salvia

Salvia nemorosa 'Mainacht' · also called May Night salvia, May Night sage · flowering

May Night is a compact, clump-forming hardy perennial sage prized for dense spikes of deep indigo-violet flowers from late spring into summer. The 1997 Perennial Plant of the Year, it thrives in full sun and lean, well-drained soil, draws bees and butterflies, and rebounds with a second flush after a hard deadheading shear.

Plant type: flowering

Watch for — Sparse rebloom: Spent spikes left in place halt new buds. Shear plants back by a third after the first flush to trigger a strong second bloom.

The reasons may night salvia isn't blooming

Almost every non-blooming may night salvia 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 may night salvia 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 may night salvia to flower

Maximise sun. Give may night salvia 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 may night salvia and get the feeding right with the may night salvia 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

May Night Salvia 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 may night salvia care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

May Night Salvia blooming — frequently asked questions

Why won't my may night salvia flower?

May Night Salvia 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 may night salvia bloom?

Give may night salvia 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 may night salvia normally bloom?