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Black Horehound (Ballota nigra) is a great plant for wildlife on green roofs. It is a perennial, with heart-shaped, bright green, toothed leaves that turn black once the plant has flowered. The stems go a purple/black as well. But it is the mauve/pink flowers that make it a star plant for bees, butterflies and other [...] Common Knapweed (Centaurea nigra) is a classic plant of rough grassland, dry meadows and road verges. This makes it ideal for planting on small scale large green roofs. It is also a great plant and is included in my species lists for brown roofs and biodiverse roofs. |
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