This striking plant is an **Aeonium** ‘Zwartkop’ (also known as ‘Black Rose’ or ‘Black Tree Aeonium’), a popular succulent known for its dramatic, almost black, rosettes of leaves. The color intensifies with more sunlight exposure, turning a deeper purple-black hue. The lighter green center you see is characteristic of new growth, which often emerges a brighter color before darkening. It's a hybrid of *Aeonium arboreum*, native to the Canary Islands, and enjoys a Mediterranean climate, thriving in West Coast gardens like those in Alameda, California, where it can grow quite large into a shrub-like form.