Acorus calamus, also known as Sweet Flag, is a lovely aquatic plant that is a common sight in many Irish ponds. Its unique yellow-green sword-like leaves can add a tropical vibe to any water feature, and its subtle, pleasant fragrance can fill the air around it. Although it does produce flowers, they are often overlooked, as the main appeal of this plant lies in its striking foliage. Acorus calamus is a great addition to any pond or water garden, as it helps to oxygenate the water and provides habitat for fish and other aquatic creatures.

Why we like it:

• Acorus calamus is a hardy plant that can thrive in a range of conditions, making it suitable for many different types of ponds and water features.
• Its unique appearance adds a touch of interest and texture to any water garden.
• It is a low-maintenance plant that requires minimal care once established.

What to know:

• Acorus calamus prefers to grow in full sun to partial shade, and in water that is between 15 and 30 cm deep.
• It can be grown in soil or in a container filled with aquatic compost.
• Although it is a hardy plant, it may struggle in extremely cold temperatures or if the water in the pond freezes over completely.
• Acorus calamus can be divided every 2-3 years to keep it healthy and vigorous.
• It blooms in late spring to early summer, producing small yellow-green flowers on a spike.

Height and Spread:

• Acorus calamus typically grows to a height of 60-90 cm and spreads to a width of 30-45 cm when fully grown.