Rhododendron (Rhododendron 'Besse Howells')
Rhododendron 'Besse Howells' offers showy, purplish-red spring blooms in zones 5-8 & works well as a hedge.
Complete Plant Information
Overview
Rhododendron ‘Besse Howells’ is a striking broadleaf evergreen cultivar valued for its vibrant spring display and reliable compact structure. As a member of the Rhododendron genus, it contributes significant architectural interest to the garden long after its flowers fade, making it a staple in temperate landscapes. This specific hybrid offers deep purplish-red blossoms which provide excellent ornamental contrast.
This particular Rhododendron cultivar reaches a manageable height and spread of 4 to 6 feet, making it highly versatile for defined landscape placement. Successful cultivation centers on replicating its native woodland conditions, focusing heavily on soil acidity, moisture retention, and drainage. Gardeners appreciate the dependable evergreen foliage provided by Rhododendron ‘Besse Howells’.
Functionally, the Rhododendron offers year-round structure and color interest, especially when situated where its blooms can be fully appreciated in May. Its robust nature in appropriate cool climates helps establish strong shrub borders and foundational plantings where a medium-sized evergreen is required.
Fast Facts
- Plant Family: Ericaceae
- Plant Type: Broadleaf evergreen
- Hardiness Zones: USDA Zones 5-8
- Size at Maturity:
- Height: 4-6 ft
- Spread: 4-6 ft
- Bloom Time: May
- Bloom Description: Purplish-red with a red blotch
- Sun Exposure: Full sun to part shade
- Water Needs: Medium
- Maintenance Level: Medium
How to Grow
Planting Rhododendron ‘Besse Howells’ should occur during the cooler seasons, focusing on creating the ideal soil environment immediately. These plants demand acidic soil, preferring a pH between 5.0 and 5.5. Utilize organically rich, humusy soil that retains moisture but drains exceptionally well; installing raised beds is recommended for heavy clay sites to prevent root rot, as Rhododendron roots dislike sitting in wet feet.
Establish the plant in a location that receives dappled shade or high open shade; while it can tolerate morning sun, hot afternoon sun risks scorching the evergreen leaves, especially in warmer regions. Protect this Rhododendron from harsh, drying winds. Given its shallow, fibrous root system, avoid cultivating near the base of the plant; instead, apply a medium layer of mulch, such as wood chips or pine needles, to conserve soil moisture and stabilize temperature.
Consistent moisture is critical; the roots must never be allowed to dry out. If soil acidity dips, you must acidify the growing medium using sulfur or iron sulfate. Immediately after the showy blooms fade in May, deadhead the spent flower clusters to encourage better flowering the following year and promote healthy new leaf flush.
Landscape Uses
Rhododendron ‘Besse Howells’ fits beautifully into several design schemes due to its pleasing habit and dense evergreen foliage. It excels when used formally as a uniform hedge, providing a structured green barrier throughout the year. Alternatively, mass planting or grouping creates a stunning, colorful impact bank during the spring bloom season.
For woodland or shade gardens, the evergreen nature of this Rhododendron provides essential structure. It pairs well visually with other acid-loving companions such as ferns, camellias, and smaller azaleas. Consider using it in mixed borders where its flower color can act as a strong focal point against contrasting foliage textures.
Foundation plantings benefit from the 4-to-6-foot stature of Rhododendron ‘Besse Howells’, offering formal structure near buildings while benefiting from the reflected light often available in these locations. Ensure that all planting sites respect the crucial need for good air circulation and protection from harsh winds.
Standout Features
Flower Qualities
- Showy
Noteworthy Characteristics
The genus Rhododendron encompasses hundreds of species, containing both what we commonly label as rhododendrons and azaleas, with most types retaining their leaves year-round. Originating mainly from the Northern Hemisphere, they captivate gardeners with their large, showy spring flower trusses. Rhododendron ‘Besse Howells’ was introduced in the 1960s and features openly funnel-shaped flowers displaying frilly, deep purplish-red petals accented by a distinct red blotch. This cultivar maintains a desirable compact habit, growing neatly to 4 to 6 feet tall and wide.
Tolerances
- Rabbit
Potential Problems
Rhododendrons are susceptible to various pests and diseases if stressed or improperly situated. Common insect threats include scale, lacebugs, and aphids, while fungal issues such as root rot, leaf spot, and canker can develop, particularly where drainage is poor. Chlorosis, recognized by yellowing leaves, often signifies too high of a soil pH, indicating an iron deficiency.
Prevention is the best defense against issues affecting Rhododendron ‘Besse Howells’. Ensure optimal cultural conditions—correct soil acidity, excellent drainage, and adequate moisture—to maintain robust health. Regular inspection of the undersides of leaves can catch pest infestations early, allowing for targeted treatment before populations become severe. Promptly remove spent blooms to redirect energy toward overall plant vigor rather than seed production.
Frequently Asked Questions
What hardiness zones is Rhododendron suitable for?
Rhododendron ‘Besse Howells’ is hardy and adaptable across USDA Zones 5 through 8. Site compatibility should always be confirmed against your local zone.
How large does Rhododendron ‘Besse Howells’ grow?
This compact Rhododendron typically matures to a height between 4 and 6 feet, with a similar spread of 4 to 6 feet wide.
When does Rhododendron ‘Besse Howells’ bloom?
This variety features its distinctive purplish-red flowers with a red blotch during the month of May.
What sun exposure does Rhododendron need?
Rhododendron prefers locations receiving full sun to part shade; afternoon shade is often beneficial in warmer climates to prevent scorch.
Conclusion
Rhododendron ‘Besse Howells’ offers gardeners a medium-sized, reliable evergreen shrub defined by its striking May floral display of purplish-red blooms. By meticulously managing soil acidity and ensuring supreme drainage, you can ensure this beautiful Rhododendron thrives for many seasons. Always confirm that your local environment supports USDA Zones 5-8 before planting this excellent cultivar.
Companion Planting Opportunities
When designing a garden space for Rhododendron ‘Besse Howells’, selecting companions that share similar acidic soil and moisture needs is paramount. Consider planting lower-growing woodland perennials beneath the canopy. Hosta varieties with blue or chartreuse foliage offer a beautiful textural and color contrast to the dark green, waxy leaves of the Rhododendron in the summer months.
For spring-to-summer interest that complements the evergreen structure, Astilbe and Impatiens thrive in the same partial shade and moist conditions required by acid-lovers. These plants do not compete aggressively for nutrients, allowing the shallow-rooted Rhododendron to establish comfortably. Avoid planting shallow-rooted companions that might compete with the Rhododendron’s primary feeding zone.
Seasonal Care Calendar
Spring marks the critical period for Rhododendron care; ensure soil pH is correct before new growth accelerates and apply a fresh layer of specialized evergreen mulch if depletion has occurred. Immediately after blooming concludes in May, perform any necessary pruning by deadheading spent trusses to direct energy into foliage and next year’s buds.
Summer care focuses entirely on consistent moisture management—the medium water requirement means checking soil moisture regularly, especially during dry spells, as these plants suffer quickly if roots desiccate. Water deeply and slowly at the base of the plant to discourage fungus development on surfaces.
In Autumn and Winter, your Rhododendron transitions into its ornamental foliage role. Inspect plants for signs of winter burn or wind damage exposure, providing temporary screening if necessary. Avoid heavy fertilizing late in the season, as this encourages tender new growth that cannot harden off before frost.
