What are the ideal growing conditions for Grevillea 'Ivanhoe'?

Grevillea 'Ivanhoe' thrives in full sun and well-drained soil. It is drought-tolerant once established and does best in USDA zones 9-11. Avoid heavy clay or poorly-draining soils to prevent root rot, and water regularly during establishment, allowing the soil to dry between waterings.

How do I care for Grevillea 'Ivanhoe' to ensure healthy growth and abundant flowers?

To care for Grevillea 'Ivanhoe', water young plants daily until established, then weekly or biweekly thereafter. Fertilization is usually unnecessary, but you may use a low-phosphorus native plant fertilizer sparingly if needed. Prune lightly after flowering to maintain shape and encourage bushier growth, and avoid overwatering to prevent root rot.

Is Grevillea 'Ivanhoe' suitable for attracting wildlife to my garden?

Yes, Grevillea 'Ivanhoe' is an excellent choice for wildlife gardens. Its nectar-rich, vibrant flowers attract a wide variety of birds, especially nectar-feeders, as well as bees and butterflies, making it ideal for supporting pollinators and creating a lively, biodiverse garden.

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Grevillea 'Ivanhoe': A Fiery Burst of Raspberry Flowering Protea

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🌿 Grevillea 'Ivanhoe': The Hardy, Fast-Growing, Crimson-Bloomer

The Grevillea 'Ivanhoe' is a vigorous and highly reliable Australian native hybrid known for its exceptional hardiness, fast growth, and striking display of crimson-red flowers.¹ This large, sprawling shrub is a popular choice for creating quick, effective privacy screens and hedges in Mediterranean and dry-climate gardens. 'Ivanhoe' features handsome, deeply serrated foliage that complements its abundant, vibrant blooms, which appear heavily through late fall and winter and sporadically throughout the year.² As a superb drought-tolerant and low-maintenance plant, it is ideal for covering large areas, stabilizing banks, and serving as a continuous nectar source for hummingbirds and native birds.³

Botanical Characteristics

Characteristic	Detail
Scientific Name	Grevillea 'Ivanhoe' (Hybrid Cultivar)
Common Names	Grevillea, Spider Flower (common genus name), Ivanhoe Grevillea.
Growth Habit	A vigorous, spreading, evergreen shrub with a dense, slightly arching and bushy habit.
Foliage	Features distinctive, deeply serrated (toothed) leaves. The foliage is stiff, leather-like, and a rich dark green color.
Flowers	Large, conspicuous, cylindrical racemes (toothbrush style). The color is a vibrant, intense crimson-red to deep scarlet, providing excellent cool-season color.
Flowering Season	Known for its extended blooming season, flowering most profusely from fall through spring, with scattered blooms often present year-round.
Nectar	Produces a copious amount of sweet nectar, making it an outstanding food source for avian wildlife.

Mature Size

'Ivanhoe' is a substantial hybrid, excellent for screening and large garden beds.⁴

Height: Typically reaches 6–8 feet (1.8–2.4 meters) tall.
Spread: Achieves a considerable spread of 8–12 feet (2.4–3.6 meters) wide, creating a broad, dense footprint.
Its vigorous growth and spreading nature are perfect for quick coverage.

USDA Hardiness Zone

This hardy Grevillea is reliably suited for USDA Hardiness Zones 9–11. It exhibits excellent tolerance for heat, dryness, and moderate coastal conditions. While it can handle light frost, like most Grevilleas, it requires protection from severe or prolonged freezing temperatures.

Cultivation and Care

Aspect	Care Instructions
Sunlight	Requires full sun (at least 6 hours of direct sun daily) to ensure dense, healthy growth and the heaviest flower production.
Soil	Essential: Demands perfectly well-drained soil. It tolerates poor, sandy, or gravelly soils but is extremely sensitive to wet feet and heavy, compacted clay.
Water	Highly drought-tolerant once established. Water deeply during the first year. Mature plants are truly low-water and require only minimal supplemental water during extreme dry periods.
Fertilizer	Crucial: AVOID all high-phosphorus fertilizers. Grevilleas are extremely phosphorus-sensitive. Use a specialized low-phosphorus formula for Australian natives or skip fertilizing entirely.
Pruning	Benefits from a harder prune after the main spring bloom to manage its size, encourage denser branching, and refresh the foliage. It also responds well to light shaping throughout the year.

Landscape Use

Privacy Screen/Hedge: Its dense, spreading habit makes it an ideal, fast-growing hedge or visual barrier.
Erosion Control: An outstanding plant for stabilizing slopes, banks, and large open areas due to its vigorous, wide-spreading root system.
Mass Planting: Excellent for mass plantings to quickly fill large, sunny landscape areas with texture and color.
Xeriscape Design: A cornerstone, low-water, low-maintenance plant for native and arid-style gardens.⁵

Wildlife Attraction

The rich, high-sugar nectar produced by the flowers is a powerful magnet for nectar-feeding birds, including hummingbirds in North America, and various native bees.⁶ Its long blooming season provides a crucial, consistent food supply throughout the cooler months.

Pest and Disease Resistance

Grevillea 'Ivanhoe' is generally a hardy, robust plant with high natural resistance to most common insect pests.⁷ The primary disease concern is fungal root rot, which is solely a consequence of poor soil drainage or overwatering—a problem easily prevented by correct planting in well-drained soil.

Propagation

To ensure the resulting plant maintains the specific, vigorous habit and brilliant crimson flower color of the 'Ivanhoe' cultivar, propagation must be achieved through vegetative methods. Semi-hardwood cuttings are the preferred and most reliable technique, typically taken during the summer months.⁸ Propagation from seed is not recommended as the hybrid characteristics will not be consistently reproduced.

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Grevillea 'Ivanhoe': A Fiery Burst of Raspberry Flowering Protea