Garden azaleas - Rhododendron in pots. The garden rhododendron is a popular plant, originally from tropical regions. Rhododendrons are related to azaleas. The biggest difference between Rhododendron and Azalea is that a Rhododendron is an evergreen bush. Rhododendron plants are generally taller, with larger leaves and flowers, compared to azaleas. Pot diameter: 19-23 cm Height with pots included: 70-80 cm Garden azalea care instructions Placement: Plant rhododendrons in a place with partial shade, where the soil is acidic and well drained Planting: Fall or early spring. In both cases, it is important to water well. Do not apply fertilizer at planting time; The new leaves and roots are not yet ready to handle the high salt content of the fertilizer and may be burned.