How to Grow Feather Reed Grass
Calamagrostis × acutiflora
Calamagrostis is a strongly upright, clump-forming grass that provides year-round structure. Plant in spring or autumn in sun to part shade and almost any soil. Cut back hard to 10 cm in late February before new growth emerges. One of the most reliable and low-maintenance ornamental grasses.
Yearly Lifecycle
Care Essentials
No feeding required. Calamagrostis thrives in average to poor soil. Avoid rich conditions which can cause flopping.
Watch For
- Rust (occasional in humid summers)
- Centre die-back in old clumps (divide to rejuvenate)
- Flopping if overfed or in too much shade
Track your Feather Reed Grass care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Full sun to partial shade
Performs best in full sun where the upright habit is strongest. Tolerates up to half-day shade but may flop slightly in deeper shade.
💧 Watering
Low once established
Drought-tolerant once the root system is established. Water regularly in the first growing season; after that, rainfall is usually sufficient in the UK.
🌱 Fertilizing
None required
Do not feed. Rich soil or added fertiliser causes soft, floppy growth that collapses the upright stems — lean conditions produce the best structure.
✂️ Pruning
Cut to 10 cm in late February
Remove all old stems in a single hard cut to about 10 cm above ground before new shoots emerge. This is the only significant annual maintenance task.
❄️ Overwintering
Fully hardy, no protection needed
Hardy to at least -20°C. The standing stems and seedheads provide valuable winter structure and wildlife habitat — leave them undisturbed until the February cut.
Growing Tips
Cut back once, cut back hard
Reduce all stems to 10 cm in late February before new shoots appear. Cutting too late into emerging growth weakens the plant and spoils the spring display.
Poor soil is a feature, not a flaw
Calamagrostis performs best in average to lean soils. Rich, fertile ground encourages soft, floppy growth that ruins the upright habit.
Leave the seedheads standing
The golden-buff flower plumes persist well into winter and look spectacular with frost. Resist tidying up until late February.
Divide every 4–5 years
When the centre of the clump starts to die out and open up, lift the whole plant in spring, discard the woody centre, and replant vigorous outer sections.
Pests & Diseases
Pest Aphids
Identification: Clusters of small soft-bodied insects on stems and flower heads, often with sticky honeydew residue.
- Blast off with a strong jet of water.
- Encourage natural predators such as ladybirds and lacewings.
- Apply a systemic insecticide containing imidacloprid as a last resort.
Pest Vine Weevil
Identification: Adult beetles notch leaf edges at night; cream C-shaped grubs in the root zone cause sudden wilting.
- Apply pathogenic nematodes (Steinernema kraussei) to moist soil in August–October.
- Inspect and remove grubs by hand when dividing clumps.
- Drench soil with acetamiprid-based vine weevil killer in late summer.
Pest Slugs
Identification: Irregular ragged holes in young emerging shoots in spring; silvery slime trails visible at ground level.
- Apply copper tape around container margins or use wool pellets as a barrier.
- Scatter iron phosphate-based slug pellets around the base in early spring.
- Use metaldehyde pellets sparingly away from ponds and wildlife.
Disease Grass Rust Puccinia spp.
Symptoms: Orange, yellow, or brown powdery pustules on leaf blades and sheaths, primarily in summer.
Treatment: Remove and bin (do not compost) affected leaves. Improve air circulation by dividing overcrowded clumps.
Prevention: Avoid overhead watering; plant at correct spacing to encourage airflow.
Disease Crown Rot Fusarium spp.
Symptoms: Yellowing and death of individual shoots from the base upwards; soft, discoloured crown tissue with a musty smell.
Treatment: Improve drainage immediately. Lift and divide the clump, discarding any soft or discoloured crown sections.
Prevention: Plant in free-draining soil or raise the crown slightly above surrounding soil level. Never waterlog.
Log Feather Reed Grass in your garden — track growth, care, and harvests year after year
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