Getting it to bloom

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

Also called Many-flowered cornflag, Adam's rib, Pennants (Chasmanthe floribunda).

More about many-flowered cornflag

About Many-Flowered Cornflag

Chasmanthe floribunda · also called Many-flowered cornflag, Adam's rib · flowering

Many-flowered cornflag is a robust, winter-growing cormous perennial from South Africa with pleated, strap-like leaves and tall, one-sided spikes carrying many tubular orange flowers from late winter into spring. It is more floriferous and slightly larger than its close relative Chasmanthe aethiopica and has become naturalised — and in some regions invasive — in coastal California and Mediterranean-climate areas, where its rapid corm multiplication allows it to spread aggressively. In frost-prone gardens it requires lifting and dry summer storage or glasshouse protection. The corms contain bioactive compounds and should be treated as mildly toxic to pets as a precaution.

Plant type: flowering

Watch for — Invasive spread: In mild Mediterranean climates (coastal California, parts of Australia, New Zealand, and the Canary Islands) Chasmanthe floribunda spreads aggressively via rapidly multiplying corms and bird-dispersed seeds; remove spent flower heads before seed ripens and divide clumps every 2–3 years to limit spread.

The reasons many-flowered cornflag isn't blooming

Almost every non-blooming many-flowered cornflag 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-flowered cornflag 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-flowered cornflag to flower

Maximise sun. Give many-flowered cornflag 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-flowered cornflag and get the feeding right with the many-flowered cornflag 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-Flowered Cornflag 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-flowered cornflag care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Many-Flowered Cornflag blooming — frequently asked questions

Why won't my many-flowered cornflag flower?

Many-Flowered Cornflag 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-flowered cornflag bloom?

Give many-flowered cornflag 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-flowered cornflag normally bloom?