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How To Grow and Care for Black Mondo Grass?

Black Mondo Grass

Imagine having a black, velvety carpet in your garden that stays lush and green all year round.

Sounds too good to be true, right? Well, it’s not.

You can achieve this by growing Black Mondo Grass.

You are about to find out why Black Mondo Grass is a must-have for any garden and how you can grow and care for it to keep it looking stunning.

Keep reading to learn practical tips that you can apply to successfully grow and care for Black Mondo Grass in your garden.

What Is Black Mondo Grass?

Black Mondo Grass (Ophiopogon planiscapus ‘Nigrescens’) is a beautiful and unique plant that is a must-have in any garden.

It’s an evergreen perennial with shiny, black leaves growing in a tufted habit.

Black Mondo Leaves

The leaves are thin and grass-like, reaching up to 12 inches (30 cm) in length, with a width of about a quarter of an inch.

The leaves are so dark that they appear almost black but have a deep purple hue when held up to the light.

Black Mondo Flowers

Black mondo grass produces small, star-shaped flowers in summer.

The flowers are usually white or pale pink contrasting nicely with the dark foliage.

The flowers are followed by shiny black berries that last until winter.

Growing Habits

Black mondo grass is a slow-growing plant that spreads by underground rhizomes.

It can reach up to 10 inches (25 cm) tall and 12 inches (30 cm) wide.

It prefers partial to full shade and moist, well-drained soil.

It can tolerate drought and frost but not extreme heat or cold.

Black mondo grass is hardy in USDA zones 5 to 10. It can also be grown indoors as a houseplant in bright, indirect light.

Mondo: A Lily in Black Cloak

Don’t be fooled by its name: Black Mondo Grass is not a true grass; it’s a member of the lily family.

Why Grow Black Mondo Grass?

Here are some of the benefits of growing black mondo grass:

  • It creates a striking contrast with lighter-colored plants and flowers.
  • It works well as a border, edging, ground cover, or accent plant.
  • It can be planted in containers, rock gardens, or mixed beds.
  • It attracts butterflies and bees with its fragrant flowers.
  • It is deer-resistant and pest-free.
  • It does not need much pruning or fertilizing.

How To Grow Black Mondo Grass?

Asparagales Ophiopogon 'planiscapus'
Source: Wikimedia

Now that you know what Black Mondo Grass is, let’s discuss how to grow it.

Black mondo is one of the easiest plants to grow in your garden. You only need a shady spot, some moist soil, and a little patience.

Here’s how to grow black mondo grass in a few simple steps.

Choose a Location for Black Mondo Grass

Black mondo grass likes moist, well-drained soil rich in organic matter.

Before planting, you can improve your soil by adding compost, peat moss, or manure. Avoid soil that is too wet, dry, or compacted.

Black mondo grass thrives in partial shade but can tolerate full sun in cooler climates.

It can also grow in full shade, but the color of the leaves may fade. Avoid planting black mondo grass in areas that get too hot or cold.

Planting Black Mondo Grass

The best time to plant black mondo grass is in spring or fall when the soil is warm and moist.

You can buy black mondo grass as potted plants or bare-root divisions from nurseries or online sources.

To plant black mondo grass, follow these steps:

  1. Dig a hole twice as wide and deep as the plant’s root ball.
  2. Loosen the roots gently and place the plant in the hole.
  3. Fill the hole with soil and press it firmly around the plant.
  4. Water the plant well and mulch around it with organic material to conserve moisture and prevent weeds.
  5. Repeat the process for each plant, spacing them 6 to 12 inches (15-30 cm) apart.

Spacing requirements for Black Mondo Grass vary depending on the desired look.

For dense ground cover, plant 6-8 inches (15-20 cm) apart. For a more spaced-out look, plant them 10-12 inches (25-30 cm) apart.

Slow and Steady Wins the Black Mondo Race

Black Mondo Grass is a slow-growing plant, so be patient with its growth. It may take up to two years to reach its full size, but the wait is worth it for the stunning foliage it produces.

How To Care for Your Black Mondo Grass?

Asparagales Ophiopogon 'planiscapus'
Source: Wikimedia

Are you ready to show your Black Mondo Grass some love?

Caring for this unique plant is easy as long as you follow a few simple guidelines.

Let’s start with watering.

Watering Black Mondo Grass

Black mondo grass likes moist but not soggy soil.

Water it regularly during the growing season, especially in hot and dry weather.

Reduce watering in winter, when the plant is dormant.

Avoid overwatering or underwatering, as both can cause problems.

Fertilizing Black Mondo Grass

Black mondo grass does not need much fertilizer, as it can get nutrients from the organic matter in the soil.

However, you can apply a balanced fertilizer once or twice a year in spring and summer to boost its growth and color.

Follow the instructions on the label, and do not overfeed.

Pruning Black Mondo Grass

Black mondo grass does not need much pruning, as it has a neat and compact habit.

However, you can trim off dead or damaged leaves in spring to keep it tidy and fresh.

In spring or fall, you can divide the clumps every few years to rejuvenate the plant and propagate new ones.

Wear gloves when pruning Black Mondo Grass to protect your hands from its sharp leaves.

Winter Care for Black Mondo Grass

Black mondo grass is hardy in USDA zones 5 to 10 but may need some protection in colder areas.

You can cover the plant with a layer of mulch, such as straw or leaves, to protect it from frost and snow.

Remove the mulch in spring when new growth emerges.

Possible Problems With Black Mondo Grass

While Black Mondo Grass is a relatively low-maintenance plant, there are a few potential problems that you may encounter.


Black Mondo Grass is relatively pest-free but can attract spider mites and slugs.

Regularly inspect your plants for signs of infestation and treat them promptly if you notice any problems.


Black Mondo Grass can be susceptible to fungal diseases like leaf spots and rust.

To prevent these diseases, avoid overwatering your plants and ensure they have good air circulation.

If you notice signs of disease, remove infected leaves and apply a fungicide as needed.

Yellow Leaves

If you notice yellowing leaves on your Black Mondo Grass, it may indicate too much sunlight.

Move your plants to a shadier spot and adjust your watering accordingly.


If you are looking for a low-maintenance and versatile groundcover, border, or accent plant, black mondo grass is a great choice.

It is an easy-to-grow plant that can enhance any garden with its dark and dramatic foliage.

Just remember, while the plant is slow-growing, it will still thrive with proper care and attention.

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