Description

Acorus gramineus ‘Pusillus’ is the dwarf form of Japanese Sweet Flag, prized for its fine, grass‑like foliage and extremely compact, tidy habit. Perfect for small ponds, container water gardens, and refined marginal planting, this miniature clump‑forming perennial adds texture, movement, and subtle fragrance when the leaves are brushed.

Its neat size makes it ideal for softening edges, filling gaps, and adding structure without overwhelming smaller spaces. A reliable, hardy performer that thrives in shallow water or consistently moist soil.

Key Features

• Ultra‑compact dwarf variety
• Fine, grass‑like foliage for texture and movement
• Aromatic leaves with a clean, sweet scent
• Perfect for small ponds and container water gardens
• Hardy, low‑maintenance, and long‑lived
• Excellent for naturalistic and contemporary planting schemes

Planting & Positioning

• Planting depth: 0–3 cm above crown
• Position: Full sun to part shade
• Ideal for: Small ponds, container ponds, bog gardens, marginal edges
• Growth habit: Very compact clump‑forming perennial
• Flowering period: May–July (small, subtle spadix)

Care & Maintenance

• Very low maintenance
• Trim away old foliage in early spring
• Divide every 2–3 years to maintain shape
• Fully hardy across the UK

Technical Data

• Botanical name: Acorus gramineus ‘Pusillus’
• Growth rate: Slow–medium
• Supplied as: Bare‑root or potted (depending on stock)
• Wildlife value: Good (shelter, structure, filtration)
• Native status: Non‑native ornamental species

Companion Plant Suggestions

• Mazus reptans ‘Blue’ – low, spreading blue flowers complement the fine foliage
• Myosotis scorpioides ‘Snowflake’ – delicate white blooms brighten the planting base
• Ophiopogon japonicus – contrasting dark green tufts for texture
• Lysimachia nummularia ‘Aurea’ – golden trailing foliage adds colour contrast

FAQ 

Is Acorus gramineus ‘Pusillus’ suitable for very small ponds

Yes — it is one of the best compact marginals for small ponds and container water gardens.

Does it spread aggressively

No — it forms tight, tidy clumps and is easy to manage.

Is it fully hardy

Yes — it is fully hardy across the UK.

Can it grow in normal garden soil

Yes — as long as the soil stays consistently moist, it thrives in bog gardens and wet borders.