Problems with slugs & snails, aphids, vine weevil, whitefly or lily beetle? They excrete honeydew, an almost pure sugar solution, on which black sooty mould will grow, causing the leaves of the plant to turn black. It grows in eastern and north-central parts of the United States. However, a fungicide may be used if required. Despite good cultural practices, pests and diseases at times may appear. Plants are too tall. In fact, it’s an ancient remedy for a wide range of problems from mites, scale, fungi, and more. Hydrangeas can grow in a wide range of soils including acid and alkaline types. Set off by showy flowers, the leaves of a hydrangea can be sensitive and the plants can demand diligent attention, including a proper supply of water and fertilization. Your container grown hydrangea may need some protection in winter. Insecticidal soap, made from potassium salt of fatty acids, works by penetrating and destroying the outer shell or membrane of the insect causing it to dehydrate and die. Select an image below to view a larger picture or a larger selection of pictures & information where available. These are the types that have pink or blue blooms depending on the pH level of the soil. You can try to remove the eggs manually but this is a very hard option and may not be successful. Scale insects are sap suckers and a large infestation can weaken plants - especially small or stressed ones. Hydrangea Pests. This will not happen overnight, so you will have to be patient. Hydrangea Diseases and Pests Printable PDF ... Other insects and pests that can sometimes cause damage to hydrangeas include oystershell scale (Lepidosaphes ulmi), and stem, leaf, and root-knot nematodes. I have two pink hydrangea bushes that must be well over 20 years old, but some stems are black with white … You should take your cutting early in the day when the plant is full of water. Scale insects in the garden can be combatted in a number of ways, the best of which involves prevention or removing infested plant material before the insects can spread. Leave about three inches (8 cm.) There are some all natural methods to treat leaf spot on hydrangeas. Before August spent blooms should be cut back to a larger branch on which new buds are present. If your plant is looking sickly it is important to find out exactly what is wrong rather than just feeding it more. Lime will result in pink blooms and sulphur will turn them blue. Particularly eye-catching, Hydrangea macrophylla 'Peppermint' features huge, rounded flower heads, up to 10 in. It may not be getting enough sun; these plants need around 3 hours of sun each day to flower well. If you want to know more, or if you've got a gardening problem you need help with, then send an e-mail to: firstname.lastname@example.org. This is an America species that is drought tolerant and will cope better with alkaline soil than the Asian varieties. Spray with Captain Jack’s Deadbug Brew (Spinosad) making sure to coat under the leaves as much as possible. Prepare a 4-inch pot filled to half an inch from the top for each cutting. Remove the soft tip growth and cut each stem into sections of 15-30 cm (6 -12 inches) with the top cut being at an angle and just above a bud. Ailing hydrangea symptoms often start at the leaves, even if the affecting disease is root or insect based. Make a hole in the compost with a dibber or pencil. Grandiflora is a good example of this variety. This will keep the leaves nice and green and healthy. There are assorted small green “fruit worms” (larvae) that eat hydrangea leaves. The American varieties are more drought tolerant than the Asian ones. 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