Agapanthus (Agapanthus praecox) is a weed when it spreads into the wild from gardens. It was introduced because of its attractive clumps of long leathery green leaves and purple, blue or white stalked flowers. It is easy to grow and hardy, but this also makes it weedy in the wild. Agapanthus - Control of Agapanthus in Gardens. Please note: You are currently browsing img ortega island traditional landscape jacksonville that is 640x426px in size. This image is listed in agapanthus garden ideas category. Agapanthus Control of Agapanthus in Gardens, 640x426 in 157.45 KB.