Sunlight
Star anise requires dappled shade and partial sun, but plant it in a warm and sunny location if you’re growing star anise in a cooler climate. Choose a position so it is not exposed to cold and dry winds.
Also, keep the plant away from the harsh afternoon sun that might burn its leaves.
Soil
Star Anise needs a well-draining medium that is slightly acidic. If you are growing it in pots, the ideal potting mix would be a blend of peat moss, river sand, well-rotted manure, and a handful of perlite.
The plant grows really well between a pH of 6.0 to 7.5.
Watering
Water the soil around your star anise in the morning once the top 2 inches feel dry. This applies to both potted and in-ground plants. Keep the soil moist but not soaked between waterings. Aim to provide at least 1 inch of water each week. Using drip irrigation is an excellent way to get water straight to the roots. In winter, reduce watering, as the soil won’t dry out as quickly.
Temperature & Humidity
It prefers a warm subtropical climate with high humidity. It is vulnerable to frost and does not survive in areas with temperatures below 15 F or -10 C. The ideal temperature range for growing star anise is between 68-95 F (20- 35 C).
Star anise trees grow best in the southern United States, in zones 7 through 9, where they experience hot summers and mild winters. In hot weather, star anise trees thrive without issues—just remember to water them as needed.
If you live in a cool area below USDA Zone 9, plant star anise in a container and keep it in a greenhouse or indoors in winter. A humidifier or an external heat source should also help the plant survive.
