Repotting guide

When & how to repot Greater Quaking Grass (Briza maxima)

Also called greater quaking grass, big quaking grass, rattlesnake grass.

More about greater quaking grass

About Greater Quaking Grass

Briza maxima · also called greater quaking grass, big quaking grass · flowering

Greater quaking grass (Briza maxima) is a self-seeding cool-season annual prized for nodding, locket-shaped spikelets that shimmer and rattle in the breeze. Grown in full sun on lean, well-drained soil, it forms a loose tuft of fine green blades topped by airy panicles that ripen from green to straw, excellent fresh or dried for arrangements.

Mature size: 45-60 cm tall and 20-30 cm wide (18-24 in tall)

How to tell greater quaking grass needs repotting

Repotting on a calendar is less reliable than reading the plant. For greater quaking grass, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot greater quaking grass

Every 2–3 years, into bone-dry mix. Greater Quaking Grass's growth habit — loose, upright clumping annual grass with slender arching stems carrying pendulous, heart-shaped spikelets that dangle and tremble on thread-fine stalks. — sets the pace. Greater quaking grass (Briza maxima) is a self-seeding cool-season annual prized for nodding, locket-shaped spikelets that shimmer and rattle in the breeze. Grown in full sun on lean, well-drained soil, it forms a loose tuft of fine green blades topped by airy panicles that ripen from green to straw, excellent fresh or dried for arrangements.

What size pot to step greater quaking grass up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Greater Quaking Grass stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot greater quaking grass

Spring or summer, while greater quaking grass is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting greater quaking grass

Repot dry. Do not water greater quaking grass for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty lean, free-draining sandy or gritty loam ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set greater quaking grass at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep greater quaking grass completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for greater quaking grass

Greater Quaking Grass wants lean, free-draining sandy or gritty loam. Thrives on poor, low-fertility soil with sharp drainage; pH-adaptable from slightly acid to alkaline. Rich, heavy or wet soils produce lush leaves at the expense of the prized seed heads. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting greater quaking grass — frequently asked questions

How often should you repot greater quaking grass?

Every 2–3 years, into bone-dry mix for greater quaking grass. Repot greater quaking grass every 2–3 years into a snug pot of lean, free-draining sandy or gritty loam, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does greater quaking grass need?

When is the best time of year to repot greater quaking grass?

Should you water greater quaking grass after repotting?

No — not straight away. Repot greater quaking grass into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise greater quaking grass after repotting?

Not immediately. Wait about 3 weeks after repotting greater quaking grass. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.