Ophiopogon ‘Nigrescens’

Description

Quick Facts

Botanical Name: Ophiopogon planiscapus ‘Nigrescens’
Common Name: Black Mondo Grass
Plant Type: Evergreen perennial groundcover
Mature Height: 15–20cm
Mature Spread: 20–30cm
Flowering Period: Summer
Flower Colour: Small pale pink to white bell-shaped flowers
Foliage Colour: Deep black, slender grass-like leaves
Hardiness: Hardy in Ireland & the UK
Soil Requirements: Moist, well-drained soil
Aspect: Full sun to part shade
Maintenance: Low

Description

Ophiopogon ‘Nigrescens’ is all about foliage — and very dark foliage at that. The almost-black, strap-like leaves form a low, tidy clump that creates instant contrast in borders, pots, and gravel planting. It’s small, slow-growing, and quietly distinctive, making it ideal when you want something a bit different without it taking over. In summer it produces tiny pale flowers, followed by dark berries, but the foliage is the main event here.

Caragh Garden Notebook

Planting:
Plant in spring or autumn into moist, well-drained soil. It does best in a sheltered position with some protection from harsh afternoon sun, especially in warmer gardens. Space plants 20–25cm apart for quicker coverage.

Watering:
Water regularly while establishing. Once settled, it is reasonably tolerant, but it looks best with steady moisture and good drainage. Avoid allowing it to dry out completely for long periods.

Feeding:
A light mulch of compost in spring is usually enough. In containers, use a balanced slow-release feed to maintain healthy growth.

Seasonal Care & Tidy-Up:
Trim away any damaged or tired leaves in early spring. It doesn’t need much attention, and the old foliage can be combed out by hand if needed.

Division (to keep plants vigorous):
Divide clumps in spring if needed, though it’s generally slow-growing and can be left undisturbed for several years.

Pests & Problems:
Generally trouble-free. The main thing to avoid is very dry or waterlogged soil. In harsher winters, a sheltered spot gives the best results.

Design Notes:
Excellent for contrast planting with pale foliage, silver leaves, or bright flowers. Works beautifully in pots, along edging, or as a low dark accent in modern planting schemes. Pairs particularly well with ornamental grasses, heucheras, and light-coloured gravel.