Getting it to bloom

Why won't my rice cutgrass bloom? (and how to make it flower)

Also called rice cutgrass, rice cut grass, false rice grass (Leersia oryzoides).

More about rice cutgrass

About rice cutgrass

Leersia oryzoides · also called rice cutgrass, rice cut grass · flowering

Rice cutgrass is a native North American wetland grass found along pond margins, stream banks, floodplains, and marshes. It spreads vigorously via rhizomes to form dense stands that stabilise saturated soils and provide vital wildlife habitat. An essential plant for wetland restoration and rain gardens. Its rough-edged leaves can lacerate bare skin — handle with care.

Plant type: flowering

The reasons rice cutgrass isn't blooming

Almost every non-blooming rice cutgrass 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 rice cutgrass 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 rice cutgrass to flower

Maximise sun. Give rice cutgrass 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 rice cutgrass and get the feeding right with the rice cutgrass 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

rice cutgrass 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 rice cutgrass care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

rice cutgrass blooming — frequently asked questions

Why won't my rice cutgrass flower?

rice cutgrass 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 rice cutgrass bloom?

Give rice cutgrass 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 rice cutgrass normally bloom?