Grandiflora Rose
Rosa (Grandiflora Group) — various cultivars
📖 About this plant
Grandiflora roses combine the best traits of two rose classes — the large, high-centered individual blooms of Hybrid Teas with the prolific cluster-flowering habit of Floribundas. The result is a vigorous, tall rose that produces abundant, showy flowers in large sprays on long stems, perfect for cutting. They are among the most versatile garden roses, working equally well as specimen plants, in borders, or as background plantings.
🧑🌾 Care requirements
Full sun (6+ hrs)
Every 2-3 days
Moderate (40-60%)
10-30°C
Well-draining, rich loamy soil (pH 6.0-6.5); amended with organic compost; mulch 5-8 cm deep to retain moisture and regulate soil temperature
Balanced rose fertilizer (10-10-10) every 4-6 weeks during growing season; supplement with magnesium (Epsom salt) in spring for greener foliage
📋 Plant facts
- 🌍 Origin
- Developed in the United States — the class originated with the cultivar 'Queen Elizabeth' ( bred by Dr. Walter Lammerts and introduced in 1954), combining the large blooms of Hybrid Teas with the cluster-flowering habit of Floribundas
- 📏 Max height
- 90-180 cm (3-6 ft); tall, vigorous, upright habit
- 📐 Spread
- 90-150 cm
- 🕰️ Bloom time
- Spring - Fall
- 🎨 Bloom color
- Pink, Red, Yellow
- 🍃 Foliage color
- Dark Green
- ⏳ Lifespan
- Perennial
- 📈 Growth rate
- Moderate
- ☠️ Toxicity
- Non-toxic — hybrid of Hybrid Tea and Floribunda roses. Petals and hips are edible, rich in Vitamin C. Thorns are the primary physical hazard. Safe around pets; leaves may cause mild GI upset if eaten in large amounts.
- 🌱 Propagation
- Softwood cuttings in early summer with rooting hormone and bottom heat; commercially grown by budding onto Rosa multiflora or Dr. Huey rootstock
🛡️ Health & Safety
Non-toxic — hybrid of Hybrid Tea and Floribunda roses. Petals and hips are edible, rich in Vitamin C. Thorns are the primary physical hazard. Safe around pets; leaves may cause mild GI upset if eaten in large amounts.
Common issues
- Black spot in humid conditions, Powdery mildew in crowded plantings with poor air circulation, Aphids and thrips on buds, Japanese beetles, Winter dieback in colder zones (zone 6 and below), Spider mites during hot dry spells, Need staking in exposed windy locations
💡 Care tips
- Cross between hybrid tea and floribunda roses for the best of both,Produces large flowers in clusters on long stems,Taller than floribundas making excellent background plants,Feed regularly during growing season for maximum bloom production
