Aeonium undulatum is a succulent evergreen subshrub, One of the larger species of aeonium with the rosette often over a metre from the ground on a single stem. Aeonium undulatum is a succulent, evergreen subshrub, one of the larger species of Aeonium with somewhat metallic-green wavy up to 10 inch (25 cm) long spoon-shaped leaves that form large rosettes on stout-stems often over a 3.3 feet (1 m) from the ground. Other rosettes do not branch off this stem (normally) but grow from the bottom, unlike most Aeoniums. Flowers are a dark yellow in a terminal cluster rising up to 20 inches (50 cm) above the foliage, usually in summer.. The plant is monocarpic so the flowering stem will die when it flowers which is normally after about 5 years. Aeoniums do not like really hot or dry weather. They may go dormant in summer and do not require any water, except in very dry conditions. In extreme heat, their leaves will curl, to prevent excessive water loss. Growing them in moist shade will keep them growing, but their true growth season is winter to spring, when temperatures are cool (65–75˚F / 18–24˚C) and damp. In the winter, water whenever the soil has dried out. Test by poking your finger down into the soil an inch or two. Too much moisture or allowing them to sit in wet soil will cause root rot. Propagate Aeoniums by stem cuttings, except for unbranched species which die after flowering and are propagated from seed. Usually fall in USDA zones 9 through 11. Aeoniums go dormant in summer; cuttings taken while plants are dormant don’t root.