Getting it to bloom

Why won't my Black Lily Magnolia bloom? (and how to make it flower)

Also called black lily magnolia, dark purple magnolia, purple tulip magnolia (Magnolia liliiflora 'Nigra').

More about black lily magnolia

About Black Lily Magnolia

Magnolia liliiflora 'Nigra' · also called black lily magnolia, dark purple magnolia · flowering

Magnolia liliiflora 'Nigra' is a compact deciduous shrub bearing exceptionally deep wine-purple, multi-petalled flowers with pale interiors. Blooming in mid-spring and often reflowering sporadically into summer, it is one of the most intensely coloured magnolias available. It suits small gardens and provides a long ornamental season.

Plant type: flowering

Watch for — Frost damage to flowers: The dark flowers open early and are vulnerable to late frosts. Situate the plant where spring sunshine is delayed (north- or east-facing aspect) to keep buds closed until frost risk has passed.

The reasons black lily magnolia isn't blooming

Almost every non-blooming black lily magnolia 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 black lily magnolia 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 black lily magnolia to flower

Maximise sun. Give black lily magnolia 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 black lily magnolia and get the feeding right with the black lily magnolia 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

Black Lily Magnolia 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 black lily magnolia care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Black Lily Magnolia blooming — frequently asked questions

Why won't my black lily magnolia flower?

Black Lily Magnolia 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 black lily magnolia bloom?

Give black lily magnolia 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 black lily magnolia normally bloom?