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"Astilbe blooms not opening? Suspect diseases or insects" Q. Please answer one question. I have a wonderful Astilbe plant that has all kinds of little buds seemingly ready to open up, but they don't and they haven't all summer. They are gorgeous when they do open up, but all I've gotten is dead-looking "blooms" that have no color. This happens year after year. What am I doing wrong? I'll appreciate your input. Thanks. A. With all the wet weather we had this past spring, I'd suspect some sort of disease is affecting the flowers. Powdery mildew has been very prevalent this year because of the wet spring and I've seen it on all sorts of plants, even those that normally don't have a problem with it. An insect that might be causing the problem is aphids. Aphids are tiny, soft-bodied insects that suck the juices out of the flower buds. They multiply rapidly because they bear live young and there can be thousands of them on a plant in a serious infestation. Whether it's a disease or insect, I recommend spraying the plant with Neem Oil. Neem Oil is an all-natural spray that is an insecticide, fungicide, and miticide all in one. It can be used on all plants including roses, perennials, annuals, trees, shrubs, flowers, fruits, vegetables, and house plants. It controls all stages of insects (adult, larvae, and egg). It acts as a growth regulator, antifeedant, repellent, and contact killer of many common and hard-to-control insect pests including aphids, Japanese beetles and other beetles, whiteflies, spider mites, mealybugs, Colorado potato beetle, striped cucumber beetle, caterpillars, hemlock woolly adelgid, scale, lily leaf beetle, fourlined plant bug, asparagus beetle, thrips, weevils or curculios (a type of weevil), sawfly, bean leaf beetle, Mexican bean beetle, flea beetle, spotted grapevine beetle, leafhoppers, leafminers, squash bug, leafrollers, psyllids, midges, fruit flies, lace bugs, and many, many more. It is safe for beneficials. The oil component makes it a very effective natural fungicide for controlling diseases like black spot on roses, rust, early blight on tomatoes, fruit tree diseases, and powdery mildew on phlox, lilacs, and roses, downy mildew, anthracnose, fungal leaf spot, botrytis (gray mold), needle rust, scab, flower, twig, and tip blight, snow mold on lawn, and alternaria. It actually rinses powdery mildew away! You don't have to know what the insect or disease is, since neem oil probably controls it. Click here to order Neem Oil from Pernell Gerver's Online Store.
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