Common Names: Green and gold, Golden Knee, Goldenstar, Alien Bush. Life Cycle: Hardy perennial. Height: 8 to 12 inches (20 to 30 cm). Native: Northern America. Family: Asteraceae.
Growing Region: Zones 5 to 9. Flowers: Late spring through to autumn. Flower Details: Yellow. Daisy-like ray and disc florets. Star-shaped. Foliage: Oval. Hairy. Opposite.
Sow Outside: Usually propagated by division.
Seeds: Surface 1/4 inch (3 mm). Summer/autumn using fresh seed. Spacing 6 to 8 inches (15 to 45 cm). Sow Inside: Germination time: three weeks. Temperature 70°F (21°C). Transplant outdoors following the beginning of spring or in the autumn.
Requirements: Partial shade, or full sunlight in colder regions. Soil pH 6.0 to 7.0. Good drainage. Moist soil, sandy soil, poor soil. Regular watering: keep soil moist at all times, but do not allow to become waterlogged. Use mulch during dry periods. Propagate Chrysogonum from root runners, or by dividing in cooler areas at the beginning of autumn.
How to grow Goldenstar and other Chrysogonum Plant Species
Ideally it is best to grow this plant from runners. If planning to grow Chrysogonum plants from seed, then you should use fresh seed and sow as soon as seed is available at a depth of 7 mm (1/3rd inch).
Plants should be grown in a partly shaded area of the garden. This location should have good drainage, and a soil of pH 6 to 7.5. The soil should also have a moist nature.
If you plan to first grow Goldenstar seedlings indoors, then they will take about three weeks to germinate at a temperature of 22 degrees centigrade (72°F).
The seedlings should be planted out in the early spring or autumn. Ideally use a spacing of about 15 cm (6 inches).
Caring for Chrysogonum in the garden
Chrysogonum plants pretty much look after themselves, though soil should be kept moist.
They can be divided to obtain more plants, this should be done in September. It is usually easier to take runners if you require more plants.