The ‘Mary Fleming’ Rhododendron is a distinctive and popular hybrid known for its appealing blooms and compact size, making it a favored choice for many garden settings. This adaptable and vibrant yet modest shrub has earned awards, including the Rhododendron of the Year Award from the American Rhododendron Society.
Distinct Characteristics of Mary Fleming Rhododendron
Appearance
The ‘Mary Fleming’ Rhododendron produces an abundance of creamy, wavy-edged flowers that often display delicate salmon pink tinges and a darker pink blotch in their throat. These bell-shaped flowers, approximately 1 inch across, can also appear as pale yellow with pink or apricot flushes, with colors potentially changing based on age or temperature. Blooming in early to mid-spring, typically in April, these blossoms create a striking display. The foliage consists of small, elliptic dark green leaves, about 2 inches long, which often emerge with bronze tones and can acquire rich bronze colors during winter, adding year-round interest.
Size and Growth Habit
This rhododendron is a compact, dwarf evergreen shrub with a broad and spreading habit. It typically matures slowly, reaching a height of 1.5 to 2.5 feet and a similar spread over the first 10 years. Its compact nature makes it suitable for smaller gardens, borders, or even containers.
Hardiness
‘Mary Fleming’ Rhododendron is quite cold-hardy and a reliable performer, thriving in USDA hardiness zones 5 through 8. It can withstand winter temperatures down to approximately -15°F (-26.1°C). Its ability to tolerate a fair amount of sun in cooler northern summers also contributes to its adaptability. The plant’s robust nature allows it to maintain attractive foliage and blooms consistently within these zones.
Planting Mary Fleming Rhododendron
Site Selection
Selecting the proper site is important for ‘Mary Fleming’ Rhododendron. The plant thrives in part shade, preferring dappled sunlight or high open shade. Morning sun with afternoon shade is suitable, as too much intense afternoon sun can scorch its leaves. Protection from strong winds is also beneficial for optimal growth. Good air circulation around the plant helps prevent disease.
Soil Preparation
‘Mary Fleming’ Rhododendron requires acidic, organically rich, humusy, and well-drained soil. The ideal soil pH range for rhododendrons is between 5.0 and 5.5. Amending heavy clay soils with organic matter like peat moss, compost, or leaf mold improves drainage and provides nutrients. Incorporating sulfur or iron sulfate can help lower the soil pH if it is too alkaline.
Planting Process
When planting ‘Mary Fleming’ Rhododendron, dig a hole that is wider than the root ball but no deeper. Plant shallowly, ensuring the top of the root ball is at or slightly above the surrounding soil level. Planting too deeply can lead to suffocated roots and poor plant health. After placing the plant, backfill the hole gently, avoiding compaction of the soil around the roots. Water thoroughly to settle the soil and eliminate any air pockets.
Ongoing Care and Maintenance
Light Requirements
‘Mary Fleming’ Rhododendron generally prefers partial shade, flourishing in conditions that provide dappled or filtered sunlight. While it can tolerate some morning sun, intense afternoon sun can cause leaf scorch. Too little light can result in sparse flowering and leggy growth, reducing the plant’s aesthetic appeal. An appropriate balance of light helps the plant develop strong stems and abundant blooms.
Watering
Consistent moisture is important for ‘Mary Fleming’ Rhododendron, especially during dry periods. The soil should remain moist but never waterlogged. Rhododendrons have shallow, fibrous root systems that can dry out quickly. Rainwater is often preferred due to its naturally acidic nature. Regular mulching around the base of the plant helps retain soil moisture and regulate soil temperature, reducing the frequency of watering needed.
Fertilization
Fertilizing ‘Mary Fleming’ Rhododendron supports vigorous growth and abundant flowering. Use fertilizers specifically formulated for acid-loving plants, as these provide the necessary nutrients while maintaining the preferred soil pH. Application is recommended after the plant has finished flowering in spring. Following the product instructions for application rates is important to avoid over-fertilization, which can harm the plant. A slow-release granular fertilizer or a liquid feed can be used, ensuring even distribution around the plant’s drip line. This timely feeding supports the development of new growth and prepares the plant for the next blooming cycle.
Pruning
Pruning ‘Mary Fleming’ Rhododendron is generally minimal, serving to maintain its shape, remove damaged branches, and encourage more blooms. The best time to prune is immediately after flowering, typically in late spring or early summer. This timing ensures that the current season’s flower buds, which form on old wood, are not removed.
Removing spent flower clusters, also known as deadheading, can promote new growth and more blooms the following year. Any dead, diseased, or crossing branches should be removed to improve air circulation and plant health.
Addressing Common Issues
‘Mary Fleming’ Rhododendron can encounter several common issues. Chlorosis, characterized by yellowing leaves with green veins, indicates an iron deficiency. This condition typically occurs when the soil pH is too high, preventing the plant from absorbing iron effectively. Adjusting soil pH with acidifying amendments like elemental sulfur or iron sulfate can help correct this.
Pests such as lace bugs can cause stippling or discoloration on the foliage, particularly on the undersides of leaves. Horticultural oil or insecticidal soap can be effective treatments for these pests.
Root rot is another common problem, usually stemming from overly wet and poorly drained soil, which suffocates the roots. Ensuring proper soil drainage and avoiding overwatering are the best preventative measures.