![]() RELATED: 11 Florals That Will Give Your Garden an English Cottage Feel Recommended Hydrangea Varieties Although the plant’s roots are known for their medicinal benefits (to treat stomach ailments, coughs, and more), the entire plant can be toxic to people and pets. Pruning hydrangeas is necessary, either after summer blooming or in late winter, based on whether the type blooms on new or old wood. Hydrangeas are fast-growing plants, adding up to 2 feet per year until reaching up to 15 feet high and 20 feet wide, depending on the variety. According to folklore, blue hydrangea flowers symbolize remorse and gratitude, while pink hydrangea flowers signal romance. The deciduous woody-stemmed shrubs produce large, show-stopping blooms, the color of which is influenced by the soil’s pH: Up to 6.0 pH results in blue flowers, while a pH of 7.0 or higher turns blooms pink. Today, there are more than 70 species of this Western U.S. Of the fungicides listed in Strategy 5, consult the Organic Materials Review Institute (OMRI™) for appropriate organic copper or sulfur products.Hydrangeas have been around since the days of the dinosaurs. Strategies 1, 2, 3, and 4 (if organic fertilizers are used) are organic approaches. Fungicides must be applied in advance of the disease as a protectant. Pesticides registered for use include copper, captan, chlorothalonil (Daconil), mancozeb, maneb, sulfur, and thiophanate methyl (Cleary 3336). Depending upon the susceptibility of the plant to this disease, spray every 10 days with a fungicide. Water early in the day so the plants have enough time to dry off completely.ĥ. Water on foliage and flowers from overhead irrigation, especially on cool, cloudy days, promotes the disease. Get a soil test to guide fertilizer practices.Ĥ. This can cause tender growth that is very susceptible to the fungus. Avoid fertilizing with excessive amounts of nitrogen. The fungus thrives in areas that are cool and moist and where plants are overcrowded.ģ. Give adequate space between plants to allow for good air circulation. Remove and destroy all infected plant parts as soon as they are observed.Ģ. The fungus is capable of invading tissue during all periods of the growing season and multiplies rapidly in declining foliage, hence, the need for good sanitation.ġ. Fungal mycelial strands (web blight) from previously infected plant parts can grow onto healthy plant parts and infect them. In the spring, spores form and spread by wind or splashing water to infect dying, wounded, or extremely soft plant tissues. Affected parts may be covered with a gray mold following damp, cool weather.īotrytis fungi overwinter as sclerotia on dead plant debris in the garden. Soft, brown spots appear on leaves, stem, and flowers following a cool damp period. Flowers may have irregular flecks and brown spots older flowers tend to rot quickly. This disease is the primary cause of decay in cut flowers.īotrytis blight causes buds and flowers to develop abnormally and turn brown. The extent and severity depends on weather conditions and cultural practices. It affects the buds, flowers, leaves, and bulbs of many plants including: African violet, begonia, chrysanthemum, cyclamen, dahlia, geranium, lily, peony, rose, and tulip. Close-up of spots caused by Botrytis blight on Chinese dogwood ( Cornus kousa)īotrytis blight, also know as gray mold, is a fungal disease caused by several species in the genus Botrytis.
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