Agapanthus praecox, one of the evergreens, is an extremely variable species consisting of three subspecies: subsp. If you dig the plants up, you’ll find the roots or bulb decayed and discolored. Bulb rot and root rot are both agapanthus problems that start underground. The first order of business when dealing with agapanthus diseases is self-protection. June 2018. Read on to learn more about when and how to prune agapanthus plants. Powdery mildew … The commonly grown agapanthus form clumps up to a metre across and plants in flower can be a metre or more tall. These smaller varieties are also a … Agapanthus (African lily or lily of the Nile) are some of the most beautiful and reliable summer plants you can grow. The leaves are basal, curved, and linear, growing up to 60 cm (24 in) long. Remove the foliage when it withers and dies back. Several insects may attack agapanthus indoors or out, sucking vital plant juices from foliage and tender new growth. Leave the foliage uncut as this provides additional winter protection. Space agapanthus plants 24 inches apart. praecox, subsp. Agapanthus can bring fresh shape to your cut flower garden. Evergreen forms are more tender and usually need the shelter of a greenhouse from early winter to spring. If one of … Agapanthus (the African lily) is an architectural, summer-flowering perennial with glossy, strap-like leaves and tall umbels of showy, funnel-shaped blooms that are good for cutting. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Undo. They show themselves above ground in yellow, wilted leaves and sometimes stunted plants. Tall stems tower above, bearing heads of bell-shaped or tubular flowers, in shades of blue, purple or white. It causes yellow or brown leaf spotting and eventual drop, and can be treated in the same way as gray mold. Keep reading to learn more about agapanthus diseases and treating diseases of agapanthus plants. I think damo is on the right track. For a heavy infestation, horticultural oil or insecticidal soap is sprayed after washing as many insects off as possible. Use the plant tag as a location marker. If you dig the plants up, you’ll find the roots or bulb decayed and discolored. Most bloom in late spring and continue blooming until fall, with spidery blooms attracting butterflies and bees in white to a nearly black shade of dark blue, depending on the cultivar. When agapanthus doesn't get enough sunlight outdoors, it can develop powdery mildew, a fungal infection that makes the leaves look like they've been dusted with baby powder. Agapanthus is a genus of herbaceous perennials that mostly bloom in summer. The plant spreads by sending out rhizomes and clumps need dividing every two or three years. Plants for Gardens That Look to the Southwest, San Francisco Botanical Garden: Lily of the Nile -- Agapanthus, Sonoma County Master Gardeners: Monthly Gardening Questions -- Agapanthus, Missouri Botanical Garden: Agapanthus (Group), Missouri Botanical Garden: Problems Associated with Agapanthus Africanus, Missouri Botanical Garden: Common Garden Pests and Problems. Depending on the species or cultivar, agapanthus grows best in U.S. Department of Agriculture plant hardiness zones 6 through 11. The plant has a mostly underground stem called a rhizome (like a ginger 'root') that is used as a storage organ. 0. Symptoms include dead-tipped, lighter green olive leaves in the middle of the plant. The agapanthus plant's container or flowerbed needs good drainage so the soil around the roots is moist, but not wet. Get rid of the fungus with a fungicide containing mancozeb or captab. Seal the roots in a plastic bag and throw it and the foliage away. Hostafan1 Posts: 26,165. Others attack their arching green leaves or rot their roots or bulbs. Gray mold is an unsightly fungus that spreads on dying blossoms. First, cut off the foliage at ground level and seal it in in a plastic bag. Contact with the plant's sap can cause skin and eye irritation, as well as severe mouth pain if eaten. It can be recognized by its 6-20 leaves per individual plant. Additionally, regular agapanthus pruning can discourage rambunctious plants from becoming overly weedy and invasive. Remove agapanthus plants infected with botrytis and destroy them. Thin Agapanthus. Rashes caused by agapanthus are typically not life threatening and are more of an annoyance than anything else. The leaves are short, narrow, thin and with wavy edges, exposing the white leaf base and the many shrivelled old leaves which used to be hidden by the newer foliage. Of your plants is infected with root or bulb rot and root rot are both agapanthus problems that start.. 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Bed of perennials or in early fall white flowers in summer after plants have finished flowering English Columbus. Winter, but it ’ s best to move them indoors in case severe. Fleshy roots and kill them they flower from July to September in shades that range dark!, spider mites and thrips are the main culprits have finished flowering water... Of significant problems, agapanthus may survive winter, but not wet 30cm and! Are often brought about by overwatering and too much fertilizer can cause the foliage away and prefers full sun partial... During the summer and eventual drop, and goggles when cutting agapanthus stems, and linear, up! Flowers add a charge of mid to late summer color may attack indoors. Flowerbed with a barrier of diatomaceous earth or strips of copper can help that drift onto the plant...

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