Platt's Black Brass Buttons

Platt's Black Brass Buttons (Leptinella squalida 'Platt's Black')

Platt's Black Brass Buttons is a very low, mat-forming groundcover that brings rich, near-black to deep bronzy foliage to the front of beds and between hardscape. It spreads into a dense carpet that helps cover bare soil and soften edges, making plantings look finished fast. In late spring into early summer, tiny yellow button flowers add a subtle bloom layer above the dark foliage. If you want a ground-hugging plant that delivers color from leaves and holds a clean, tight look, this is a strong choice.

Distinctive Features

This leptinella forms ferny, finely cut foliage that ranges from deep green to bronze with strong dark, nearly black tones, especially with brighter light. The habit is extremely low, typically about 0.5 to 2 inches tall, while spreading outward by runners to form a broad mat. Small, button-like yellow flowers appear in late spring to early summer and are secondary to the foliage impact. It can tolerate light foot traffic, making it useful as a living filler in cracks and along stepping areas when moisture is consistent.

Growing Conditions

• Sun: Full sun to partial shade, with light shade helpful in hot summer climates.
• Soil: Well-drained soil with organic matter, and it prefers soils that stay evenly moist.
• Water: Moderate to consistent moisture, and it is intolerant of drought once established.
• USDA Zones: USDA Zones 4 to 9.
• Mature Size: About 0.5 to 2 inches tall and 12 to 24 inches wide, spreading over time.

Ideal Uses

• Focal Point: Use as a focal point by planting a broad patch where the near-black foliage reads as a bold, graphic carpet against stone and brighter greens.
• Between Pavers: Tuck between stepping stones and pavers where it can handle light foot traffic and knit gaps cleanly.
• Groundcover: Mass along bed fronts and small slopes to cover soil, reduce weeds, and add dark foliage contrast.
• Rock Gardens: Place in rock and gravel gardens where the low mat and fine texture complement stone.
• Edging: Use as a crisp, low edge plant that softens hard lines without adding height.

Low Maintenance Care

• Watering: Water regularly during establishment and during dry spells to keep the mat dense and attractive.
• Trimming: Shear or edge as needed to control spread and refresh the carpet after flowering.
• Soil Drainage: Improve heavy soils with compost and grit so roots stay healthy and winter stress is reduced.
• Weeding: Weed early while it is filling in, then the dense mat will help suppress new weeds.
• Division: Lift and replant rooted sections in spring or fall to thicken thin spots or expand coverage.

Why Choose Platt's Black Brass Buttons?

• Dark Foliage Contrast: Near-black, ferny foliage adds depth and makes surrounding plants look brighter.
• Ultra Low Profile: Stays close to the ground, making it ideal for edges, cracks, and small spaces.
• Fast Knit: Spreading runners help it fill gaps and form a continuous carpet over time.
• Hardscape Friendly: Useful between stones and along paths where a living filler improves the finish.
• Subtle Bloom: Tiny yellow buttons add a light seasonal accent without distracting from the foliage.

If you want a groundcover that acts like a living design detail, Platt's Black Brass Buttons is a reliable pick in sun to partial shade with consistent moisture. Give it good drainage and regular water, especially in heat, and it will form a dense, dark mat that looks intentional from day one. Planting in repeated patches is the simplest way to get the strongest visual impact and the cleanest coverage.