Getting it to bloom

Why won't my White Arrow Arum bloom? (and how to make it flower)

Also called White Arrow Arum, Spoonflower, White Arrow-arum (Peltandra sagittifolia).

More about white arrow arum

About White Arrow Arum

Peltandra sagittifolia · also called White Arrow Arum, Spoonflower · flowering

A native southeastern US wetland perennial prized for its snowy-white, scoop-shaped spathe and glossy arrow-shaped leaves. It thrives in boggy margins, shallow ponds, and rain gardens. Plant in consistently wet or waterlogged soil in full sun to partial shade; tolerates standing water. Minimal fertiliser needed in rich organic soils. Spreads slowly by offsets.

Plant type: flowering

Watch for — Failure to flower: Usually caused by insufficient light or soil too low in organic matter. Move to a sunnier position and enrich the growing medium with well-rotted compost.

The reasons white arrow arum isn't blooming

Almost every non-blooming white arrow arum 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 white arrow arum 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 white arrow arum to flower

Maximise sun. Give white arrow arum 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 white arrow arum and get the feeding right with the white arrow arum 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

White Arrow Arum 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 white arrow arum care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

White Arrow Arum blooming — frequently asked questions

Why won't my white arrow arum flower?

White Arrow Arum 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 white arrow arum bloom?

Give white arrow arum 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 white arrow arum normally bloom?