Getting it to bloom

Why won't my Amazon Moonflower Cactus bloom? (and how to make it flower)

Also called Witti's Moonflower, Amazon Cactus, Epiphytic Moonflower (Selenicereus wittii).

More about amazon moonflower cactus

About Amazon Moonflower Cactus

Selenicereus wittii · also called Witti's Moonflower, Amazon Cactus · flowering

Selenicereus wittii is a remarkable epiphytic cactus from the Amazonian floodplains of Brazil and Peru, where it grows pressed flat against tree trunks alongside rivers. Its flattened, ribbon-like green stems cling to surfaces, and it produces large, fragrant white flowers that open at night. An extraordinary collector's species requiring warm, humid conditions. Generally pet-safe as a true cactus.

Plant type: flowering

Watch for — Failure to bloom: Requires maturity (typically 3+ years on a proper support) and a slight reduction in watering and temperature in winter to initiate buds.

The reasons amazon moonflower cactus isn't blooming

Almost every non-blooming amazon moonflower cactus 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 amazon moonflower cactus 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 amazon moonflower cactus to flower

Maximise sun. Give amazon moonflower cactus 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 amazon moonflower cactus and get the feeding right with the amazon moonflower cactus 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

Amazon Moonflower Cactus 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 amazon moonflower cactus care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Amazon Moonflower Cactus blooming — frequently asked questions

Why won't my amazon moonflower cactus flower?

Amazon Moonflower Cactus 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 amazon moonflower cactus bloom?

Give amazon moonflower cactus 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 amazon moonflower cactus normally bloom?