Panicle hydrangeas (Hydrangea paniculata) Pink Diamond plants are deciduous shrubs with growing needs particular to the hardiness zone, sun and soil requirements, and pruning. Susceptible to gray mold and powdery mildew, keeping the plant vigorous through appropriate care and growth is essential to continued health. For pink diamond's 12 inch clusters of white flowers that become pink, proper growth will yield vibrant blooms.
Panicle hydrangea Pink Diamond plants can grow to a height and width of 10 to 15 feet, provided their growing needs are addressed, according to the University of Illinois Extension. This deciduous shrub thrives in full sun to partial shade.
This hydrangea prefers moist, well-drained soil. Panicle hydrangeas are tolerant to wind, salt and dry sites, but for optimal growth, following preferred requirements is best.
Plant your pink diamond panicle hydrangea in U.S. Department of Agriculture hardiness zones 3 to 8, as recommended by the Michigan State University Extension. Planting in appropriate hardiness zones ensures that your hydrangeas will be able to thrive within the climate in which they are growing; hydrangea growth rate is approximately 18 inches annually.
Pruning is essential to plant growth because it removes weak parts of a plant and encourages new growth. According to the NC State University Cooperative Extension, especially for successful growth of long stems on established pink diamond hydrangea plants, you can prune right away after the plant has flowered and your plant will likely rebloom. You may also cut your hydrangea plant back during the winter season. Flowering will occur again the next year even if you prune during winter months. Panicle hydrangeas are known as tough, hardy plants, so you can cut them back as liberally or conservatively as desired.
Hydrangeas are susceptible to fungal diseases including gray mold and powdery mildew. Fungal infections can cause illness, stunted growth or even death of your plant. Gray mold is an infection caused by the fungus botrytis cinerea. The fungus attacks weakened plants, causing twig blight, fruit rot and, in high humidity, a gray-hued web resembling gray mold covers dead tissue. Powdery mildew also affects hydrangeas. An infection caused by several different species of fungi, powdery mildew creates white patches on all parts of pink diamond hydrangeas, leading to stunted growth, leaf drop and malformation.
To prevent these diseases, make sure your plant is kept vigorous through proper sunlight exposure and air circulation; overwatering, exposure to chemicals or excessive fertilizer, injury and stress weaken hydrangeas and create a prime target for fungal disease, according to the University of Illinois Extension's HortAnswers. Healthily growing plants resist disease.