Golden trumpet is a climber that can grow as high as 20 feet or you can prune the plant into a shrub. This tropical evergreen has yellow showy flowers that can dress up any garden. Although it is sometimes difficult, you can grow golden trumpet indoors if you have a large and very sunny room. Golden trumpet does not tolerate frost and is hardy only in USDA Zones 10 and 11. For areas in those zones that do get occasional cold winters, the plant must be brought indoors or into a greenhouse to survive.
Choose your location by finding an area with full sun, either near a structure for the plant to climb or by making your own. You can use a trellis, fence or wire and stakes to create a structure. If you are planting near a fence, be sure the fence does not block the sun from the young plant. If you are making your own structure, do so before you plant the golden trumpet or you could damage the plant's roots.
Prepare the soil by cultivating the soil to 6 inches deep and 6 inches in diameter. If you are planting more than one plant, leave 3 to 6 feet between plants. Add a couple handfuls of compost to the soil at each planting location and mix into the soil well. This will enrich the soil and ensure good drainage.
Plant in the spring by digging a hole in the cultivated soil so the roots will be at the same level as they are in the container that you purchased the plant in. Fill with soil halfway up the root ball and water. Then, continue to fill until the roots are covered, then water again. Add more soil as the water will sink the soil in. Press the soil down firmly around the plant.
Keep the soil moist until you see new growth on the plant. Then allow the soil to dry at the top before watering, probably every other day. Once the new growth starts, add some general purpose fertilizer to the soil and then again in summer. Follow directions as to how much fertilizer to use for the particular brand you purchased.
Tie the branches loosely to the structure to train the plant where you want it to go. Use strips of old pantyhose or a flexible tie so you don't damage the branch as it grows. Take the ties off as it grows. Once the golden trumpet is growing where you want it to, remove all the ties.
Prune to create a shrub from the plant by cutting off the branches as they reach the height you would like your shrub. You can also pinch off the ends of the branches to encourage thicker shrubs. Thin out branches in both vines and shrubs from the inside to allow air to circulate through the plant. This will keep it from developing a mildew problem.