Getting it to bloom

Why won't my Pontederia cordata 'Alba' bloom? (and how to make it flower)

Also called White Pickerelweed (Pontederia cordata 'Alba').

More about pontederia cordata 'alba'

About Pontederia cordata 'Alba'

Pontederia cordata 'Alba' · also called White Pickerelweed · flowering

A white-flowered selection of native pickerelweed, bearing dense spikes of pure white blooms over glossy heart-shaped leaves all summer above shallow water. Loved by pollinators, it suits pond margins and bog gardens in full sun and spreads by rhizomes. Not individually ASPCA-listed, so treat with caution around pets despite the species' edible reputation.

Plant type: flowering

Watch for — Reversion or mixed colour: Seedlings around an 'Alba' plant may revert to blue; rogue out blue-flowered seedlings to keep the white planting pure.

The reasons pontederia cordata 'alba' isn't blooming

Almost every non-blooming pontederia cordata 'alba' 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 pontederia cordata 'alba' 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 pontederia cordata 'alba' to flower

Maximise sun. Give pontederia cordata 'alba' 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 pontederia cordata 'alba' and get the feeding right with the pontederia cordata 'alba' 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

Pontederia cordata 'Alba' 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 pontederia cordata 'alba' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Pontederia cordata 'Alba' blooming — frequently asked questions

Why won't my pontederia cordata 'alba' flower?

Pontederia cordata 'Alba' 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 pontederia cordata 'alba' bloom?

Give pontederia cordata 'alba' 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 pontederia cordata 'alba' normally bloom?