Calamagrostis Grasses – Elegant Ornamental Options for NZ Gardens

The Best Calamagrostis Grass In New Zealand

Calamagrostis grass, a member of the Poaceae family, is a popular ornamental grass that graces many gardens and landscapes. Known for its striking foliage and feathery plumes, Calamagrostis spp. offers both beauty and functionality. If you're in New Zealand and considering adding this versatile plant to your garden, you're in the right place!

Understanding Calamagrostis Grass

What is Calamagrostis?

Calamagrostis, commonly known as feather reed grass, is a perennial grass that grows in clumps. It is native to temperate regions of the Northern Hemisphere and is known for its upright, narrow growth habit. The grass typically blooms from late spring to early summer, producing tall flower spikes that turn into feathery seed heads.

Benefits of Calamagrostis Grass

Calamagrostis grass is favoured for several reasons:

• Visual Appeal: Its tall, slender form and feathery plumes add texture and movement to garden designs.
• Low Maintenance: It requires minimal care once established.
• Drought Tolerance: This grass adapts well to various soil conditions and can withstand dry spells.
• Wildlife Friendly: The grass provides habitat and food for various insects and birds, promoting biodiversity.

Popular Calamagrostis Varieties in New Zealand

Calamagrostis Karl Foerster

This is perhaps the most well-known variety of Calamagrostis. 'Karl Foerster' is celebrated for its upright form and resilience. It grows up to 1.8 metres tall and features dark green leaves with striking golden flower spikes that persist into winter. This variety is perfect for adding vertical interest to borders and mixed plantings.

Calamagrostis Overdam

Calamagrostis 'Overdam' is a striking ornamental grass prized for its variegated foliage. It has green leaves with cream-white margins and grows as a bold, upright clump. Pinkish-green flower plumes rise above the foliage in summer, maturing to a soft tan that persists through winter.

Planting and Caring for Calamagrostis Grass

Ideal Growing Conditions

Calamagrostis grass is adaptable but flourishes best with a well-drained, fertile soil. It grows well in full sun but can handle partial shade. It has moderate water needs but can endure periods of drought once established.

Planting Tips

• Planting in early spring or autumn is optimal.
• Allow at least 60 cm between plants to accommodate their mature size.
• Plant at the same depth as the pot it came in to ensure proper root development.

Maintenance

• Cut back the old foliage to about 15 cm above the ground in late winter or early spring before new growth begins.
• Apply garden fertilizer in spring to encourage healthy growth.
• Divide clumps every three to four years to maintain vigour and prevent overcrowding.

Do You Cut Back Calamagrostis?

Yes, you can cut back Calamagrostis. The best time to cut back Calamagrostis is in the late winter or early spring. This will remove any dead or damaged foliage and encourage new growth. To cut back Calamagrostis, simply use a sharp pair of shears or a scythe to cut the plants back to the ground. Be careful not to cut into the new growth.

Does Calamagrostis spread?

Calamagrostis grasses can spread slowly over time through their rhizomes, which are underground stems that send out new shoots. However, they are not known to be invasive and are relatively easy to control. If you are concerned about Calamagrostis spreading too much, you can plant it in a container or raised bed. You can also divide the clumps every few years to keep them in check.

Designing with Calamagrostis Grass

Landscape Applications

Calamagrostis grass is versatile and can be used in a variety of landscape designs:

• Borders and Edges: Use Karl Foerster to create a dramatic vertical accent along borders or pathways.
• Meadow Gardens: Combine Calamagrostis with wildflowers for a naturalistic meadow effect.
• Mixed Plantings: Pair with perennials like Echinacea or Rudbeckia for contrasting textures and colors.
• For providing seasonal interest: During Spring and Summer, enjoy the fresh, green foliage and developing flower spikes. In autumn, appreciate the warm, golden tones as the plumes mature. During winter, the dried seed heads provide structure and interest in the winter garden.