Getting it to bloom

Why won't my Giant Sacaton Grass bloom? (and how to make it flower)

Also called giant sacaton, giant alkali sacaton (Sporobolus wrightii).

More about giant sacaton grass

About Giant Sacaton Grass

Sporobolus wrightii · also called giant sacaton, giant alkali sacaton · flowering

Giant sacaton (Sporobolus wrightii) is a large, fast-growing warm-season native bunchgrass of the American Southwest, forming a sturdy arching fountain of grey-green blades topped by tall, feathery flower plumes. Extremely drought- and heat-tolerant yet able to handle periodic flooding, it makes a bold architectural specimen or screen in sunny, low-water landscapes.

Plant type: flowering

The reasons giant sacaton grass isn't blooming

Almost every non-blooming giant sacaton grass 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 giant sacaton grass 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 giant sacaton grass to flower

Maximise sun. Give giant sacaton grass 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 giant sacaton grass and get the feeding right with the giant sacaton grass 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

Giant Sacaton Grass 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 giant sacaton grass care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Giant Sacaton Grass blooming — frequently asked questions

Why won't my giant sacaton grass flower?

Giant Sacaton Grass 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 giant sacaton grass bloom?

Give giant sacaton grass 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 giant sacaton grass normally bloom?