Getting it to bloom

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

Also called Muir's Sage, Cape Sage, Wild Sage, Vicks Sage (Salvia muirii).

More about muir's sage

About Muir's Sage

Salvia muirii · also called Muir's Sage, Cape Sage · flowering

Salvia muirii is a small, twiggy, evergreen shrub endemic to the southern Cape coast of South Africa, native to rocky coastal scrub between the Cape of Good Hope and Mossel Bay. It produces intense blue flowers from mid-summer to autumn and bears leathery, grey-green leaves that when crushed release a distinctive menthol-like scent reminiscent of Vicks VapoRub. The most important care fact is providing sharp drainage and full sun; once established, it is highly drought tolerant and frost hardy for a South African shrub. The genus Salvia is listed as non-toxic to cats, dogs, and horses by the ASPCA.

Plant type: flowering

Watch for — Legginess with age: Plants become woody and open-centred after 3–4 years; prune lightly after flowering each year to maintain compact, bushy habit and delay the need for replacement.

The reasons muir's sage isn't blooming

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

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

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

Muir's Sage blooming — frequently asked questions

Why won't my muir's sage flower?

Muir'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 muir's sage bloom?

Give muir'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 muir's sage normally bloom?