Horizon Monarch Rhododendron (Rhododendron 'Horizon Monarch') | Award-Winning Yellow Rhododendron

1/4

Horizon Monarch Rhododendron

Rhododendron 'Horizon Monarch'

An award-winning rhododendron with soft yellow flowers, vivid red flares, and dark pink buds, blooming in late spring.

$199.00

Quality Guarantee

Free Delivery Over $199

+1 650-241-8858 (SMS ok)

Local Plant Delivery

Delivered by our local network

Current Nursery Inventory

Availability reflects current sourcing

Living Plants

Size, shape and branching naturally vary

Description

Rhododendron 'Horizon Monarch' is an award-winning evergreen shrub prized for its spectacular trusses of soft yellow flowers, dark pink to scarlet buds, and exceptional disease resistance. This vigorous, medium-sized hybrid produces large, dome-shaped clusters of up to 15 openly funnel-shaped flowers in a pale, warm, creamy yellow to light yellow, each with a small, vivid red flare and delicate pink tones on the outside, blooming from late spring to early summer (May to June) . The dark pink to scarlet flower buds provide a striking contrast before opening to the soft, luminous blooms. With its dense, upright, spreading habit, leathery, dark green, elliptic leaves, and outstanding hardiness, it is an excellent choice for foundation plantings, woodland gardens, shaded borders, informal hedges, and as a specimen plant. Winner of the Royal Horticultural Society's Award of Garden Merit (AGM) .

Quick Facts

Needs confirmation

Foliage & Flowers: Leathery, elliptic, dark green, evergreen leaves (to 7 inches long); large, dome-shaped trusses of 15+ openly funnel-shaped, pale creamy-yellow to light yellow flowers (4 inches across) with a small, vivid red flare and pink outer tones, blooming from May to June (midseason) .
Mature Height: 5-8 ft (1.5-2.5 m) over 5-10 years .
Mature Spread: 5-8 ft (1.5-2.5 m) .
Growth Rate: Moderate to fast (reaches approx. 6 ft in 10 years) .
Hardiness Zones: USDA 6-9 (cold hardy to 5°F / -15°C) .
Light Requirement: Partial shade to dappled shade (morning sun with afternoon shade; protect from harsh hot afternoon sun) .
Core Benefits: RHS Award of Garden Merit, soft yellow flowers with red flare, dark pink buds, dense rounded habit, excellent disease resistance, long-lived .
Best Uses: Foundation plantings, woodland gardens, shaded borders, informal hedges, mass plantings, specimen plant, cottage gardens, banks and slopes .

Faqs

Q: What color are the flowers of 'Horizon Monarch'?
A: The flowers are a unique, soft pale creamy-yellow to light yellow with a small, vivid red flare in the throat and delicate pink tones on the outside. The unopened buds are a striking dark pink to scarlet .

Q: When does it bloom?
A: It blooms in late spring to early summer (typically May to June), with the large flower trusses lasting several weeks .

Q: How large does it grow?
A: It typically reaches 5-8 feet (1.5-2.5 m) in both height and spread over 5-10 years. It is a moderate to fast grower, reaching about 6 feet tall in 10 years .

Q: How much sun does it need?
A: It performs best in partial shade to dappled shade. It thrives in morning sun with protection from harsh, hot afternoon sun. An east-facing or north-facing location is ideal .

Q: What soil does it need?
A: It requires well-drained, humus-rich, acidic soil with a pH between 4.5 and 5.5 .

📍 Primary Delivery Area · San Francisco Bay Area

Local delivery across the Bay Area — and beyond.

San Francisco Bay Area is our primary local delivery market. Victory Nursery also serves additional California markets and selected extended delivery areas by arrangement.

Regular local delivery: San Francisco, Peninsula, South Bay, East Bay, Marin, Tracy / Mountain House and surrounding service areas.

Shop now

A good garden starts with the right size

Choose your starting point.

15 Gallon

One of the most common larger landscape sizes for trees and shrubs. It offers noticeable height and fullness while still being practical for many residential planting projects.

Explore 15 Gallon Plants

Gallon describes the container size, not a guaranteed plant height. Individual plants vary. Contact our nursery for current measurements.

Discover More from Victory Nursery