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Fertilising guide

How to fertilise Quaking Grass (Briza media)— schedule & NPK

Also called quaking grass, trembling grass, doddering dillies.

More about quaking grass

About Quaking Grass

Briza media · also called quaking grass, trembling grass · flowering

Quaking grass is a dainty, cool-season perennial grass famous for its heart-shaped, locket-like flower spikelets that dangle on hair-fine stems and tremble with the slightest breeze. Forming low tufts of blue-green foliage, it suits wildflower meadows, gravel gardens and naturalistic borders. The papery, shimmering seedheads dry beautifully and are prized for cut and dried arrangements.

Growth habit: Low, tufted, semi-evergreen clump of fine blue-green foliage sending up slender, wiry stems hung with delicate, nodding, locket-shaped flower spikelets that quake in the breeze.

What fertiliser quaking grass actually wants — and why

Quaking Grass is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for quaking grass: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed quaking grass, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For quaking grass:

Needs no feeding and actually prefers lean soil; fertiliser produces lax, floppy growth and fewer of the prized dancing seedheads. Skip feeding entirely in average ground. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

The dormant-season rule matters more than the exact interval: skip feeding entirely when quaking grass is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for quaking grass

Half strength is the safe default for quaking grass — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

Feeding always goes onto already-damp soil, never dry roots — water quaking grass first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the quaking grass watering schedule.

Signs you are over-feeding quaking grass

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for quaking grass:

Signs you are under-feeding quaking grass

If the symptoms point at watering, light or roots rather than nutrition, the full quaking grass care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of quaking grass with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

Organic vs synthetic feeds for quaking grass

Organic options

A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.

Synthetic / liquid feeds

A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising quaking grass — frequently asked questions

What fertiliser does quaking grass need?

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Quaking Grass is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

How often should I feed quaking grass?

Needs no feeding and actually prefers lean soil; fertiliser produces lax, floppy growth and fewer of the prized dancing seedheads. Skip feeding entirely in average ground. Needs no feeding and actually prefers lean soil; fertiliser produces lax, floppy growth and fewer of the prized dancing seedheads. Skip feeding entirely in average ground. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

What strength of feed for quaking grass?

Half strength is the safe default for quaking grass — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding quaking grass look like?

Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding quaking grass year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.

Should I flush the soil of quaking grass?

Flush the pot of quaking grass with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

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