Miscanthus Sinensis Care: How to Grow & Prune Maiden Grass

If there is one plant I consider the absolute monarch of my backyard, it is Miscanthus sinensis. Also known as Maiden Grass or Eulalia grass in North America, this tall, elegant ornamental grass lends unparalleled grace and grandeur to any garden landscape.

At this time of the year, Miscanthus is at its absolute best—flowing and glowing. The wind sends its feathery flower heads rippling and dancing, and when backlit by the rays of the sunset, the entire plant seems to catch fire. Here is everything I have learned about growing, pruning, and designing with this magnificent grass.

Origins and Sizing

The wild species of this tall grass originates in China, Japan, Korea, and Taiwan. It has since given rise to hundreds of ornamental cultivars that truly represent the royalty of the grass family. They have incredible longevity and the structural ability to stand upright for seemingly endless periods of time. Even after winter has withered their leaves to a beige-and-brown crisp, they maintain their elegant poise.

The foliage height ranges dramatically depending on the cultivar. Dwarf varieties, such as ‘Adagio’ and ‘Little Kitten,’ stay around half a meter tall. Giant varieties, like ‘Silberfeder’ and ‘Grosse Fontane,’ easily reach 1.5 meters or more! Keep in mind that height is also dictated by your soil. In highly fertile soil, they will explode in size, while in poorer, dry urban soil (like my front garden), they often reach only about two-thirds of their textbook stature.

Spring Pruning and Fertilizing

Members of the Miscanthus tribe are “warm-season” grasses. This means they wake up quite late in the spring, grow all summer steadily, and finally produce their distinctive flower panicles in early autumn.

The absolute best time for maintenance is early spring. Grab a sharp pair of secateurs (heavy-duty pruning shears) and shear the dead, dried plant down to about 3 or 4 inches from the ground.

After cutting, water the crown thoroughly and apply a healthy layer of mulch. If you don’t have well-rotted manure, use your own homemade compost or a handful of pelleted chicken manure. (A quick warning: dogs and foxes go absolutely crazy for pelleted chicken manure. They will scrabble at the base of your newly dressed plant until they find every last morsel!

A Secret Weapon Against Garden Pests

While we are on the subject of garden pests, I have to share one of my favorite eco-friendly tricks. When you chop down the dead grass in the spring, do not throw the leaves away!

The chopped-up, dried leaves of most ornamental grasses have incredibly sharp, microscopic edges. If you scatter these grass fragments thickly around the base of your vulnerable plants (like hostas), they create a highly uncomfortable surface that naturally deters snails and slugs from crossing over to your precious greens.

The Best Miscanthus Varieties to Grow

The late German plantsman Ernst Pagels raised many of today’s best Miscanthus selections. These grasses became a staple of the “New Perennial” movement popularized by landscape designers like Piet Oudolf. Here are some of the most striking varieties you can find at good garden centers:

• ‘Goliath’: A true giant that hoists its reddish-brown plumes a full meter higher than its foliage.
• ‘Ferner Osten’: Features beautiful arching red flower heads and stunning orange autumn foliage.
• ‘Grosse Fontane’: Known for pinkish flower heads that slowly fade to a frothy white.
• ‘Malepartus’: Produces wine-colored plumes that fade to a silvery-pink, accompanied by orange-and-buff autumn leaves.

Troubleshooting Common Problems

Miscanthus combines beautifully with many other perennials (especially tall, airy plants like Rudbeckia and Verbena bonariensis). Generally, there are no heavy insect or disease issues. It is a highly resilient plant!

However, in some specific parts of the U.S., you may encounter two main issues: Miscanthus mealybug and Miscanthus blight. The mealybug provokes dwarfed growth and is hard to eradicate because it hides deep inside the protective leaf sheaths. Miscanthus blight is a fungal disease that attacks the blades and sheaths, sometimes presenting as leaf rust.

Lastly, keep in mind that older, mature clumps (3-4 years and older) of certain varieties, like ‘Gracillimus,’ produce so much foliage that they may occasionally require a hidden support ring to prevent them from flopping over after heavy summer rains.