Holden’s™ Red Rhododendron

Rhododendron ‘HoldenRhodo221’ PP 35,416

Plants that Work®

Patented Deep Ruby-Red Trusses Ignite Mid-Spring Gardens with Unmatched Vibrancy
Thrives in Zones 5-8
Grows 4-5 ft Tall, 6-8 ft Wide
Showy Red Blooms in Late Spring
Perfect for Privacy Screen or Hedge

$109³⁹

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Plant Size

Product variants

Planting & Care

Where to Plant

Sunlight: This variety thrives in dappled sunlight or morning sun with afternoon shade. While it can handle about 4 to 6 hours of direct light, too much hot afternoon sun will scorch the leaves and cause the vibrant red flowers to fade prematurely.
Soil: Aim for rich, acidic, and well drained soil that feels like a wrung out sponge. If you have heavy clay, plant it in a raised mound to keep the roots from sitting in water, and mix in pine bark or peat moss to lower the pH.

Watering Requirements

During the first year, water your Holden’s™ Red two to three times a week to help the shallow root system settle into its new home. Once established, it is relatively drought tolerant, but you should still provide a deep soaking during dry summer spells to prevent the flower buds for next year from drying up. Inconsistent watering often leads to "leaf curl," which is the plant's way of telling you it is thirsty and stressed.

Pruning Tips

These rhododendrons bloom on old wood, so you must prune them immediately after the spring flowers fade. Simply "deadhead" the spent blooms by snapping them off with your fingers to redirect energy into growth rather than seed production. Think of it like a light trim; avoiding late season pruning ensures you do not accidentally cut off next year's flower buds.

Fertilizer Needs

Apply a dedicated acid loving plant fertilizer in early spring just as new growth begins to emerge. Avoid using high nitrogen fertilizers in late summer, as this encourages soft new growth that will not have time to harden off before the first frost. This prevents the "winter kill" that often happens when tender stems are exposed to freezing temperatures.

Delivery and Shipping

Shipping Rates

Ships in 7-10 business days • Tracking provided • Weather protected

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee

Understanding Our Container Sizes

At Nature Hills, our plants are sold in industry-standard nursery containers. You will notice we use the word "container" rather than "gallon." Container numbers follow a nursery trade size standard, not liquid volume. The number tells you the plant's size category and general maturity level. A larger container means a more established plant with a stronger root system.

Container Sizes

Quart

Plant age: 6 months to 1 year
Best for: Ground covers, perennials, ornamental grasses
What to expect: Our smallest and most affordable size. Well-suited for planting in multiples across a large area. Allow 1 to 2 seasons for full establishment.

#1 Container

Plant age: 1 to 2 years
Best for: Shrubs, perennials, smaller trees
What to expect: About the size of a large coffee can. A well-developed root system in a manageable size. Good value choice when you have time to let the plant grow into the space over a season or two.

#2 Container

Plant age: 2 to 3 years
Best for: Shrubs and trees where you want faster establishment
What to expect: A noticeable step up from a #1 in both plant size and root development. Good choice when you want visible presence without going to a larger size.

#3 Container

Plant age: 3 to 4 years
Best for: Most plants, most situations — flowering trees, shade trees, evergreen shrubs
What to expect: Our most popular size. Strong, developed root system. Plants in a #3 container make an immediate visual impact from day one. If you want a head start rather than waiting seasons for a plant to fill in, this is typically the right choice.

#5 Container and Larger

Plant age: 4 to 5+ years
Best for: Specimen plants, privacy screens, maximum instant impact
What to expect: Large, mature plants ready to make an immediate statement in your landscape. We also carry #7 and larger sizes for select varieties.

Why "Container" and Not "Gallon"?

Nursery container sizes follow an industry trade standard established for the nursery and horticulture industry. The number is a size designation, not a measurement of liquid volume. Actual soil volume varies by plant type, root mass, and growing medium. Using "container" is the accurate industry term. When you see #1, #2, or #3, think of it as the plant's size tier, not a gallon measurement.

Root Pouch Containers

Some Nature Hills plants arrive in a Root Pouch, a breathable fabric container made from 100% recycled materials. Root Pouches encourage denser root development through air pruning, which discourages root circling and promotes a stronger, more fibrous root ball at the time of planting.

Plants growing in Root Pouch fabric containers, showing the breathable woven fabric construction

There are two types. Knowing which one you have changes how you plant:

Degradable (brown or tan fabric): Plant the entire pouch directly in the ground. The fabric breaks down naturally in the soil over time.
Non-degradable (black or gray fabric): Remove the pouch before planting. Cut the bottom open with scissors, then peel the sides away. The fibrous root ball will hold its shape.

Not sure which type you have? Check the tag on your plant or contact us and we will confirm.

Full Root Pouch planting guide

Choosing the Right Size

Size	Plant Age	Best For
Quart	6 mo to 1 yr	Ground covers, perennials, grasses. Budget-friendly for mass plantings.
#1 Container	1 to 2 yrs	Shrubs, perennials, small trees. Value choice for patient gardeners.
#2 Container	2 to 3 yrs	Shrubs and trees where you want faster establishment.
#3 Container	3 to 4 yrs	Most plants. Immediate visual impact. Our most popular size.
#5 and larger	4+ yrs	Specimen plants, privacy screens, maximum instant impact.

Still not sure which size is right for your project? Our plant specialists are happy to help. Contact us and we will point you in the right direction.

Plant specifications
Plant Characteristics	Evergreen, Flowering, Cold hardy, Deer-resistant
Hardiness Zone	4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Sunlight	Partial shade
Height	4-5 ft
Width	6-8 ft
Watering Needs	Moderate
Preferred Soil	Loamy, Peaty, Sandy
Growth Rate	Fast
Growth Habit	Bushy
Blooms In	Spring
Flower Color	Red
Foliage Color	Green
Pet Safety	Toxic to pets
Suitable Space	Outdoors
Plant Name	Azalea
Botanical Name	Rhododendron ‘HoldenRhodo221’ PP 35,416
Species	hybrid
Cultivar	HoldenRhodo221
Class	Ericales, Magnoliopsida
Does Not Ship To	AK, HI, ID, MT, PR

Looking for a fiery spring showstopper? Holden's™ Red Rhododendron PP#35,416 (Rhododendron 'HoldenRhodo221') sets the garden ablaze with trusses of deep, ruby-red blooms in mid to late spring. This broad-leaved evergreen shrub dazzles with its glowing flowers, making it a true garden star! The blooms are rounded trusses packed with vibrant color, giving an unforgettable display right when spring gardens need their brightest moment.

This modern hybrid shows off with glossy, leathery foliage that keeps its handsome green color year-round. Dense and mounding in habit, Holden's™ Red forms a broad, spreading shape that matures to about 4-5 feet tall and 6-8 feet wide, perfect for hedges or specimen plantings. Its sturdy evergreen structure means your landscape keeps good bones even in the winter months.

Key Features

Rhododendrons have a history of symbolizing elegance and natural beauty, making Holden's™ Red a cultural and horticultural treasure.

Bold ruby-red flower clusters in spring
Broadleaf evergreen shrub with glossy green foliage
Compact, broad, mounded form
Reaches 4-5 feet tall and 6-8 feet wide
Unique hybrid introduction

Landscaping Uses

Holden's™ Red Rhododendron is a showpiece shrub that shines in mixed shrub borders, woodland gardens, and foundation plantings. Its evergreen foliage and big spring blooms make it versatile and impactful.

Perfect as a flowering hedge or privacy screen
Bold specimen shrub in the front yard
Adds structure to foundation plantings
Great companion for Azaleas, Ferns, and Hostas
Ideal in woodland or shade gardens

Care & Maintenance

Holden's™ Red Rhododendron thrives in USDA growing zones 5-8. This broad-leaved evergreen keeps its foliage all year, providing lasting beauty. It prefers consistent moisture, acidic soil, and partial shade for best health and bloom performance. Learn more in our guide to Rhododendron care and pruning.

Planting Time: Best in spring or fall
Sun Requirements: Part shade to filtered sun (morning sun, afternoon shade)
Soil Requirements: Acidic, rich, organic, well-drained soil - does not tolerate alkaline or compacted soils
Moisture Needs: Keep soil evenly moist - use the Finger Test. New shrubs need consistent water during their first year
Mulch: Always apply a 3-4 inch deep layer of Arborist Mulch to regulate temperature and conserve moisture
Fertilization Needs: Use a fertilizer for acid-loving plants in spring after flowering; compost works well too
Pruning Info: Minimal pruning needed - prune right after bloom if shaping is necessary. Avoid cutting late, as it forms buds on old wood.
Special Perks: Deer-resistant, low-maintenance once established, excellent cold and heat tolerance for its range
Provide winter watering for broadleaf evergreens to prevent winter burn. Read how and why here!

Don't forget to order your Nature Hills Root Booster for lifelong mycorrhizal symbiotic root support

Red Hot Beauty You'll Adore!

Gorgeous Holden's™ Red Rhododendron brings sizzling spring color with year-round structure that's impossible to ignore. Its bold blooms and evergreen form will anchor your garden in all seasons. Order your Holden's™ Red today from Nature Hills, and start enjoying unforgettable color right at your doorstep!

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Frequently Asked Questions

What are the sunlight or shade requirements for planting Holden's™ Red Rhododendron?

Holden's™ Red Rhododendron thrives in partial shade to filtered sunlight, preferring morning sun with afternoon protection. This ensures the best bloom performance and prevents leaf scorch. Plant in a location that receives dappled light under trees or on the north side of structures for optimal results.

How often should I water Holden's™ Red Rhododendron, and how do I keep soil moist but not soggy?

Water Holden's™ Red Rhododendron deeply once weekly, adjusting for rainfall and seasonal needs. This zones 5-8 shrub prefers consistent moisture but well-draining, acidic soil to prevent root rot. Apply 2-3 inches of mulch around the base to retain moisture and regulate soil temperature, available at naturehills.com.

Is Holden's™ Red Rhododendron cold hardy down to -20°F or for northern climates?

Holden's™ Red Rhododendron is hardy in USDA zones 5-8, which means it can typically handle temperatures down to around -10°F to -20°F in zone 5. For reliable performance in northern climates, provide some winter protection from harsh winds and ensure good drainage to prevent root damage.

Can Holden's™ Red Rhododendron ship to Alaska, Hawaii, or Arizona?

Holden's™ Red Rhododendron grows in USDA zones 5-8, which excludes most of Alaska, Hawaii, and Arizona. These regions fall outside the plant's cold and heat tolerance range. Check your specific zone before ordering to ensure success.

How do I prune Holden's™ Red Rhododendron without affecting next year's blooms?

Prune Holden's™ Red immediately after its spring bloom period ends, since next year's buds form on new growth. Remove spent flower clusters and lightly shape the shrub in late spring or early summer. Shop Nature Hills for this zone 5-8 showstopper that reaches 4-5 feet tall.

Does Holden's™ Red Rhododendron require acid-loving fertilizer, and when?

Yes, Holden's™ Red Rhododendron benefits from acid-loving fertilizer since it prefers acidic soil conditions. Feed in early spring before blooming and again in late spring after flowers fade. Use a fertilizer formulated for acid-loving plants like rhododendrons and azaleas.

Is Holden's™ Red Rhododendron resistant to diseases like Phytophthora cinnamomi?

Holden's™ Red Rhododendron's disease resistance to Phytophthora cinnamomi isn't specified for this particular hybrid. Like most rhododendrons, proper drainage and avoiding waterlogged soils in zones 5-8 are your best prevention. Plant in well-draining, acidic soil with consistent but not excessive moisture.

What is the bloom time and flower color for Holden's™ Red Rhododendron?

Holden's™ Red Rhododendron blooms in mid to late spring with deep ruby-red flower trusses. The rounded clusters create a fiery display just when spring gardens need their brightest moment. Plant in partial shade with acidic soil for the best bloom performance.

Holden’s™ Red Rhododendron

Rhododendron ‘HoldenRhodo221’ PP 35,416