Rhizomes should be planted with the top protruding out of the soil. Water well and mulch, re-water as the soil dries out. After flowering, cut back the spent flower stems to make room for new growth. As tropical plants, Heliconias prefer temperatures over 20C. However, there are several heliconias that are suitable for coastal areas all the way down to Sydney.
If possible we recommend potting your rhizomes up. They can be planted out when they shoot and establish roots. If you are in a particularly cold area it is best to purchase your heliconias in spring so that they have a full growing season before encountering winter conditions.