Where Should You Plant Agapanthus. When planting in pots root congestion is not a major concern as Agapanthus plants tend to respond quite well to this. If you want to grow them in the garden make sure the soil temperature is at least 50 F 10 C.
30012011 Plant agapanthus in a suitable location. Use a soil-based compost such as John Innes no 2 or 3 and feed plants in spring with a slow release fertiliser. If youre in USDA Zone 8a or above fall is the best time to plant.
Terra cotta pots look especially good with the blue flowers.
04092020 Plant them around structures in your yard such as birdbaths trees or buildings. If youre in USDA Zone 7b or lower aim for planting in Spring after the last expected frost. Gardeners in Florida should plant their agapanthus in full sun for the best blooms. As the shade increases though the flowering will decrease so bear this in mind when selecting a spot.