Red Anne Hydrangea, a cultivar of Hydrangea macrophylla, is cherished for its vibrant, deep red blooms. This Bigleaf Hydrangea provides a striking presence and consistent summer interest in garden settings.
Understanding Red Anne Hydrangea
‘Red Anne’ is a deciduous shrub with a rounded growth habit, reaching 4 to 8 feet tall and wide. It showcases large, crimson mophead flowers that emerge from spring through summer and often continue into early autumn. ‘Red Anne’ is hardy in USDA Zones 6 through 9.
The deep green foliage provides an excellent backdrop for its vibrant flowers, maintaining visual interest even when the plant is not in bloom. Its robust nature and consistent flowering make it a desirable addition to garden beds or as a potted specimen.
Planting Red Anne Hydrangea
Selecting an appropriate planting site is important for ‘Red Anne’ Hydrangea’s health and bloom production. This plant thrives in locations that receive morning sun and are protected from the intense heat of the afternoon sun, especially in warmer climates. Partial shade is preferred, as too much direct sun can stress the plant.
The ideal soil for ‘Red Anne’ should be fertile, well-draining, and moisture-retentive, such as a loamy soil. Incorporating organic matter like compost can improve soil structure and fertility. For optimal red flower color, maintaining a neutral to slightly alkaline soil pH is recommended.
When planting, dig a hole that is two to three times wider than the root ball, ensuring the top of the root ball is level with the surrounding soil. Gently loosen any circling roots before placing the plant in the hole. Backfill with amended soil, then water thoroughly to settle the soil around the roots. Planting in early spring or fall allows the plant to establish its root system before extreme temperatures.
Caring for Red Anne Hydrangea
Consistent moisture is important for ‘Red Anne’ Hydrangea, particularly during dry periods. Newly planted hydrangeas require frequent watering, several times a week, for at least the first two years to help them establish robust root systems. Established plants need about one inch of water per week, applied deeply at the base of the plant in the early morning to allow foliage to dry before nightfall.
Fertilization supports vigorous growth and abundant flowering. A balanced, slow-release fertilizer with an NPK ratio like 10-10-10 or a formulation for flowering shrubs can be applied in early spring. Bigleaf hydrangeas may benefit from a second application in mid-summer. Avoid fertilizing late in the growing season, as this can stimulate tender new growth vulnerable to winter damage.
‘Red Anne’ typically blooms on old wood, meaning flower buds form on the previous year’s growth. Pruning should occur immediately after the plant finishes flowering in early summer to avoid removing next season’s buds. Deadheading spent blooms can encourage the plant to produce more flowers.
In colder climates, providing winter protection is beneficial for ‘Red Anne’ to safeguard its flower buds. After the ground freezes, apply a 6 to 8-inch layer of mulch, such as straw or shredded leaves, around the base of the plant to insulate the roots. In USDA Zone 7 and colder, covering the plant with burlap or frost cloth during severe cold snaps can further protect dormant buds.
Addressing Common Issues
Lack of blooms is a common concern, stemming from several factors. Improper pruning, specifically cutting back old wood in late fall or early spring, often removes the flower buds that formed the previous season. Winter injury to dormant buds from extreme cold can also prevent flowering.
Environmental conditions also affect bloom production; too much shade can inhibit flower formation, while excessive sun exposure may stress the plant. Over-fertilizing with high-nitrogen products promotes leafy growth at the expense of flowers. Ensuring proper light, consistent moisture, and balanced nutrition can help encourage blooms.
Leaf discoloration often indicates underlying issues. Yellowing leaves can suggest overwatering or nutrient deficiencies, while browning may signal underwatering or sun scorch. Fungal leaf spots, appearing as dark or yellowed patches, are common and can be managed by removing affected foliage and ensuring good air circulation around the plant.
Pests like aphids and spider mites can infest ‘Red Anne,’ causing distorted or speckled leaves. Aphids can be dislodged with a strong spray of water or treated with insecticidal soap. Spider mites thrive in hot, dry conditions and can often be managed by washing them off with a hose.