Garden flowers

Feather grass

StipaPoaceae
Also: Mexican feather grass, Pony tail grass, Stipa, Nassella, Giant feather grass, Golden oats, Stipa gigantea
Mexican feather grassPony tail grass, Nassella

Mexican feather grass

The single most damaging mistake is treating this like Miscanthus and cutting it back hard in spring — this genus is groomed by combing, not cutting, and a hard cut often kills it outright rather than rejuvenating it.

Full sun Water: little H4down to −10 °C 40–60 cm tall · 40–60 cm wide In a pot: yes
Flowering · UK
Flowering · Northern Italy
Flowering · Central Italy
Flowering · Southern Italy and islands

Care

Light

Needs full sun and good drainage to thrive.

Water

Very drought-tolerant once established; dislikes winter wet far more than it dislikes cold.

Soil

Free-draining, poor-to-average soil. Struggles and often rots in heavy, wet clay over winter — improve drainage before planting if in doubt.

Pruning

Never cut back hard. Comb through the clump with gloved fingers in spring to pull out dead, brown blades — this genus does not reshoot reliably from a hard cut and can be killed outright by one.

Feeding

No feeding. These are dry-meadow grasses and a fertile soil gives lax, floppy growth with far less of the fine, moving texture they are grown for.

Propagation

Divide in spring, or lift the self-sown seedlings that appear round the parent — these seed themselves generously, sometimes to the point of nuisance, so free plants are rarely in short supply.

Month by month

Months change with the climate: in southern Italy tomatoes go out two months earlier than in England.

  1. MarchComb through with fingers to remove dead blades; do not cut back hard. how ›
  2. JuneEnjoy the fine flowering plumes moving in the slightest breeze. how ›
  3. OctoberLeave standing for winter texture and light. how ›

Months based on climate: UK. Your choice stays on this device.

  1. MarchComb through with fingers to remove dead blades; do not cut back hard. how ›
  2. JuneEnjoy the fine flowering plumes moving in the slightest breeze. how ›
  3. OctoberLeave standing for winter texture and light. how ›

Months based on climate: Northern Italy. Your choice stays on this device.

  1. FebruaryComb through with fingers to remove dead blades; do not cut back hard. how ›
  2. MayEnjoy the fine flowering plumes moving in the slightest breeze. how ›
  3. OctoberLeave standing for winter texture and light. how ›

Months based on climate: Central Italy. Your choice stays on this device.

  1. FebruaryComb through with fingers to remove dead blades; do not cut back hard. how ›
  2. MayEnjoy the fine flowering plumes moving in the slightest breeze. how ›
  3. NovemberLeave standing for winter texture and light. how ›

Months based on climate: Southern Italy and islands. Your choice stays on this device.

Common problems

Hard cutting back kills or badly weakens the plant

How to spot it. Little or no regrowth after being cut back hard, the way a deciduous grass like Miscanthus would be treated.

What to do. Never cut back this type — comb out dead blades by hand instead.

Rotting crown in wet winter soil

How to spot it. A soggy, brown collapse at the base of the plant over a wet winter.

What to do. Improve drainage, or grow in a raised position or gritty soil from the outset.

Self-seeding

How to spot it. Seedlings appearing throughout the border.

What to do. This genus self-seeds readily and can become a bit weedy; remove unwanted seedlings while small if this isn't wanted.

Giant feather grassGolden oats, Stipa gigantea

Giant feather grass

Like the finer Stipa types, this one is combed and tidied rather than cut back hard — only the spent flower stems are properly cut out, at the base. The evergreen leaves stay in place year-round.

Full sun Water: little H4down to −10 °C 1.8–2.5 m tall · 60–100 cm wide In a pot: no
Flowering · UK
Flowering · Northern Italy
Flowering · Central Italy
Flowering · Southern Italy and islands

Care

Light

Needs full sun for strong, upright flower stems.

Water

Regular watering while young; drought-tolerant once well established.

Soil

Free-draining soil; tolerates poor or dry soil well once established, and actually flowers more sturdily in lean conditions.

Pruning

Comb and tidy the evergreen basal foliage in spring rather than cutting it hard back. Cut out the previous year's old flower stems individually at the base, usually in late winter, once they've lost their appeal.

Feeding

A light feed at the spring cut-back if the soil is poor, and nothing otherwise. The tall flowering stems are the feature here, and they stand up better on a lean soil.

Propagation

Divide in mid-spring once new growth is clearly moving, never in autumn — a division made into cold wet soil usually rots before it roots.

Month by month

Months change with the climate: in southern Italy tomatoes go out two months earlier than in England.

  1. MarchComb through the base to remove dead foliage. how ›
  2. AprilCut out the previous year's old flower stems at the base. how ›
  3. JuneEnjoy the tall, oat-like flower heads catching the light and moving in the wind. how ›

Months based on climate: UK. Your choice stays on this device.

  1. MarchComb through the base to remove dead foliage. how ›
  2. AprilCut out the previous year's old flower stems at the base. how ›
  3. JuneEnjoy the tall, oat-like flower heads catching the light and moving in the wind. how ›

Months based on climate: Northern Italy. Your choice stays on this device.

  1. FebruaryComb through the base to remove dead foliage. how ›
  2. MarchCut out the previous year's old flower stems at the base. how ›
  3. MayEnjoy the tall, oat-like flower heads catching the light and moving in the wind. how ›

Months based on climate: Central Italy. Your choice stays on this device.

  1. FebruaryComb through the base to remove dead foliage. how ›
  2. MarchCut out the previous year's old flower stems at the base. how ›
  3. MayEnjoy the tall, oat-like flower heads catching the light and moving in the wind. how ›

Months based on climate: Southern Italy and islands. Your choice stays on this device.

Common problems

Cutting the whole plant back hard

How to spot it. No regrowth, or a badly disfigured plant, after being sheared like a deciduous grass.

What to do. Comb the foliage instead of cutting; only remove old flower stems individually, at the base.

Flopping flower stems

How to spot it. Floppy, lax flower stems that don't stand upright.

What to do. Usually from soil that's too rich or over-fed — avoid feeding and grow in lean soil for the sturdiest stems.

Popular varieties

Stipa ‘Pony Tails’AGM45–60 cm × 45 cm · June–AugustJune–AugustMay–AugustMay–August · Mexican feather grass

Questions

Feather grass: is it hardy?

H4: Hardy through an average UK winter. It survives down to −10 °C.

Can it grow in a pot?

Mexican feather grass: Does very well in a pot with sharp drainage, e.g. with extra grit mixed into the compost. Giant feather grass: Possible in a very large container, but this genus is really at its best with room to spread out in open ground.

Feather grass: when do you prune it?

Mexican feather grass: Never cut back hard. Giant feather grass: Comb and tidy the evergreen basal foliage in spring rather than cutting it hard back. In the calendar for UK, pruning falls in April.

Feather grass: when does it flower?

In the climate of UK it flowers in June–August.

When do you feed it?

Mexican feather grass: No feeding. These are dry-meadow grasses and a fertile soil gives lax, floppy growth with far less of the fine, moving texture they are grown for. Giant feather grass: A light feed at the spring cut-back if the soil is poor, and nothing otherwise. The tall flowering stems are the feature here, and they stand up better on a lean soil. Feeding months, UK: April.