Getting it to bloom

Why won't my Brassia 'Rex' bloom? (and how to make it flower)

Also called King Spider Orchid (Brassia Rex).

More about brassia 'rex'

About Brassia 'Rex'

Brassia Rex · also called King Spider Orchid · flowering

Brassia Rex is a vigorous, large-flowered hybrid spider orchid (B. verrucosa x B. gireoudiana) bred for big, star-shaped, yellow-green flowers heavily barred with chocolate brown, often carried many to a spike. Easy and forgiving for a Brassia, it wants bright indirect light, an airy bark mix, warmth, and high humidity, and is one of the best spider orchids for beginners.

Plant type: flowering

Watch for — Few or no flowers: Most often too little light. Brassia Rex is shy to bloom in dim conditions; brighten its position and ensure mature pseudobulbs are well grown before expecting spikes.

The reasons brassia 'rex' isn't blooming

Almost every non-blooming brassia 'rex' 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 brassia 'rex' 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 brassia 'rex' to flower

Maximise sun. Give brassia 'rex' 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 brassia 'rex' and get the feeding right with the brassia 'rex' 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

Brassia 'Rex' 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 brassia 'rex' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Brassia 'Rex' blooming — frequently asked questions

Why won't my brassia 'rex' flower?

Brassia 'Rex' 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 brassia 'rex' bloom?

Give brassia 'rex' 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 brassia 'rex' normally bloom?