Getting it to bloom

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

Also called Common saltmarsh grass, Sea poa, Seaside alkali grass (Puccinellia maritima).

More about common saltmarsh grass

About Common Saltmarsh Grass

Puccinellia maritima · also called Common saltmarsh grass, Sea poa · flowering

Puccinellia maritima is a fine-leaved, stoloniferous perennial grass native to the saltmarshes, mudflats, and tidal creeks of northwest Europe, including virtually all British and Irish estuaries. It forms the characteristic short turf of the upper and mid saltmarsh zone, tolerating regular tidal flooding and high salinity. The most important care fact is that it requires saline or brackish, periodically flooded, fine-textured soils — it will not persist in freshwater or freely drained garden conditions. Common saltmarsh grass is not listed as toxic by the ASPCA and is considered non-toxic to pets.

Plant type: flowering

The reasons common saltmarsh grass isn't blooming

Almost every non-blooming common saltmarsh 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 common saltmarsh 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 common saltmarsh grass to flower

Maximise sun. Give common saltmarsh 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 common saltmarsh grass and get the feeding right with the common saltmarsh 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

Common Saltmarsh 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 common saltmarsh grass care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Common Saltmarsh Grass blooming — frequently asked questions

Why won't my common saltmarsh grass flower?

Common Saltmarsh 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 common saltmarsh grass bloom?

Give common saltmarsh 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 common saltmarsh grass normally bloom?