To plant Pretoria tall canna lilies, you can follow these steps:

1. Choose a location that receives full sun or partial shade.
2. Prepare the soil by adding organic matter such as compost or well-rotted manure.
3. Dig a hole that is twice as wide and deep as the root ball of the plant.
4. Place the plant in the hole and backfill with soil.
5. Water thoroughly after planting and keep the soil moist but not waterlogged.
6. Fertilize with a balanced fertilizer every 4-6 weeks during the growing season.
7. Deadhead spent flowers to encourage more blooms.

Canna lilies are tender perennials that are hardy in USDA zones 8-11. They can be grown in containers or in garden beds.