Royalty Purple Raspberry
Rubus idaeus 'Royalty'
A stunning purple raspberry variety that combines the best traits of red and black raspberries, producing large, sweet-tart berries with a unique wine-like flavor. Developed at Cornell University, this vigorous grower produces heavy yields on strong, self-supporting canes. The deep purple fruit is perfect for fresh eating and makes spectacular jams with incredible color.
Harvest
70-80d
Days to harvest
Sun
Full sun to partial shade
Zones
4–8
USDA hardiness
Height
6 feet
Planting Timeline
Showing dates for Royalty Purple Raspberry in USDA Zone 7
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Royalty Purple Raspberry · Zones 4–8
Growing Details
Zone-by-Zone Planting Calendar
Complete Growing Guide
This Cornell-bred cultivar requires a slightly longer season than standard red raspberries, so plan for 70-80 days to peak production and ensure your growing region has adequate warmth for the complex flavor to fully develop. Royalty thrives in well-draining soil with consistent moisture and full sun exposure, which intensifies the wine-like character of the fruit. Unlike black raspberries, this variety is less prone to anthracnose when given proper air circulation, though spider mites can be problematic in hot, dry conditions—monitor closely during heat waves. The self-supporting canes are notably vigorous and may require minimal trellising, but they benefit from summer pruning to encourage lateral branching and denser fruit production. For best results, apply mulch to regulate soil temperature and moisture throughout the growing season, which helps prevent the fruit cracking that can sometimes occur with purple varieties during inconsistent watering.
Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0). Drainage: Good Drainage. Spacing: 3 feet-6 feet, 6-feet-12 feet. Growth rate: Medium. Maintenance: Medium. Propagation: Division, Stem Cutting. Regions: Coastal, Mountains, Piedmont.
Harvesting
Royalty Purple Raspberries reach peak harvest readiness when their deep purple skin develops a rich, wine-dark color with a subtle sheen, the berries achieve full plumpness, and they yield gently to fingertip pressure without becoming mushy. Unlike single-harvest varieties, Royalty produces continuously throughout the season, typically from mid-summer through early fall, rewarding frequent picking every two to three days during peak season. The critical timing tip specific to this cultivar: harvest in early morning after dew dries but before afternoon heat, as the wine-like compounds that define Royalty's flavor profile are most concentrated and stable during cooler hours, and the berries' firm texture makes them easier to detach cleanly from their cores at this time.
Botanically the fruits are not berries (though they are usually called berries)– they are instead made of many small drupes. The fruits hold together in a hollow cone. Cultivars exist in various colors and tend to be more productive than the straight species.
Color: Gold/Yellow, Orange, Purple/Lavender, Red/Burgundy, White. Type: Aggregate, Drupe. Length: < 1 inch. Width: < 1 inch.
Garden value: Edible, Showy
Harvest time: Summer
Edibility: Fruit can be eaten raw or cooked and delicious when eaten out of hand. The fruit is also used in pies, preserves, and in wines. An herb tea is made from the dried leaves and some say that a type of tea made from raspberry and blackberry leaves is an excellent coffee substitute.
Storage & Preservation
Fresh Royalty raspberries keep 2-3 days at room temperature or up to one week refrigerated at 32-35°F with high humidity. Don't wash until ready to use, as moisture accelerates spoilage. Store in shallow, breathable containers—never pile them deep.
For long-term preservation, freeze unwashed berries in single layers on baking sheets, then transfer to freezer bags. Their firm texture holds up better than most raspberries when frozen. The intense color and wine-like flavor make them exceptional for jam-making—their natural pectin content creates excellent gel formation. Dehydrate at 135°F for fruit leather or dried berries. The complex flavor profile also makes them surprisingly good candidates for raspberry wine or vinegar—the deep color creates stunning finished products that red raspberries can't match.
History & Origin
Royalty Purple Raspberry was developed at Cornell University's New York State Agricultural Experiment Station in Geneva, New York, through the breeding work of Dr. Robert Lamb. Released in 1982, this variety was created by crossing 'Newburgh' red raspberry with 'Cumberland' black raspberry, aiming to combine the best characteristics of both parents.
The breeding program specifically targeted improved hardiness, disease resistance, and unique fruit characteristics that would appeal to both commercial growers and home gardeners. Purple raspberries as a class had existed before, but most suffered from poor vigor or inferior fruit quality. Royalty represented a breakthrough—delivering the self-supporting canes of black raspberries with better flavor and the heavy productivity of red varieties.
The 'wine-like' flavor that distinguishes Royalty comes from its unique anthocyanin profile, inherited from both parent species. This made it popular not just for fresh eating but for value-added products like specialty jams and even home winemaking, carving out a niche market that continues today.
Advantages
- +Unique wine-like flavor distinguishes Royalty from standard red or black raspberries
- +Large berries and heavy yields reduce picking time and increase harvests
- +Self-supporting canes require minimal staking or trellis infrastructure
- +Spectacular deep purple color creates stunning, naturally vibrant jam
- +Cornell University breeding ensures proven vigor and disease resistance genetics
Considerations
- -Susceptible to multiple serious diseases including cane blight and anthracnose
- -Requires vigilant pest management for cane borers, aphids, and Japanese beetles
- -Purple skin stains hands and clothing during harvest and processing
- -Moderate difficulty level demands consistent pruning and cane management skills
Companion Plants
Chives and garlic are the most practical companions here. Their sulfur compounds deter aphids, which can colonize new raspberry growth fast enough to distort leaves before you notice. Plant them at the drip line of the canes rather than right at the base, so they're not competing for the same 6.0–7.0 pH sweet spot. Comfrey earns its spot differently: its taproot pulls calcium and potassium from 2-3 feet down, and you drop that back on the surface when you cut the leaves as mulch — free fertilizer without synthetic inputs. Marigolds (Tagetes erecta specifically) add some Japanese beetle disruption in the surrounding area, though the effect is modest at best.
Black walnut is a hard no. Juglone — the allelopathic compound in walnut roots and hulls — builds up in the soil and will stunt raspberry canes well before you trace the cause back to that tree 40 feet away. Fennel causes similar problems through allelopathy and has no business in a perennial bed you're trying to establish for years. Potato shares Verticillium wilt with raspberries, so keep the two as far apart as your garden allows.
Plant Together
Chives
Repels aphids and Japanese beetles while improving soil health
Garlic
Deters aphids, spider mites, and root borers with natural sulfur compounds
Marigolds
Repel nematodes and aphids while attracting beneficial predatory insects
Comfrey
Deep roots bring nutrients to surface and leaves make excellent mulch
Tansy
Repels ants, mice, and flying insects that damage berry crops
Clover
Fixes nitrogen in soil and provides living mulch to retain moisture
Yarrow
Attracts beneficial insects and improves soil fertility through deep roots
Nasturtiums
Act as trap crop for aphids and cucumber beetles while repelling squash bugs
Keep Apart
Black Walnut
Releases juglone toxin that inhibits raspberry root development and growth
Fennel
Produces allelopathic compounds that stunt raspberry growth and reduce fruit production
Potato
Shares verticillium wilt disease and attracts Colorado potato beetles to area
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #2346410)
Pests & Disease Resistance
Resistance
Good resistance to mosaic virus and root rot
Common Pests
Raspberry cane borer, aphids, spider mites, Japanese beetles
Diseases
Cane blight, anthracnose, powdery mildew, gray mold
Troubleshooting Royalty Purple Raspberry
What you'll see, why it happens, and what to do about it.
Canes wilting and snapping at a point 4-6 inches below the tip, often with a visible hole or sawdust-like frass near the break
Likely Causes
- Raspberry cane borer (Oberea bimaculata) — adult beetle girdles the cane in two rings, larvae tunnel downward
- Mechanical damage from wind or trellising that masks the initial girdling
What to Do
- 1.Cut the cane 6 inches below the lower girdle ring and destroy it — don't compost it
- 2.Check remaining canes for the characteristic double ring and prune those out immediately
- 3.Keep canes thinned to 4-6 per hill so you can actually spot damage early
Dark brown to black elongated lesions on canes, often with a cracked or sunken appearance, showing up in spring on second-year wood
Likely Causes
- Cane blight (Leptosphaeria coniothyrium) — enters through pruning wounds or winter cracks
- Anthracnose (Elsinoe veneta) — gray or purple-bordered spots that can look similar in early stages
What to Do
- 1.Prune out and dispose of all affected canes at ground level — do not leave stubs
- 2.Sanitize pruners with 70% isopropyl alcohol between cuts so you're not spreading the pathogen
- 3.Improve airflow by removing weak or crossing canes; target 3-4 feet between rows if you have them
White powdery coating on leaves and young canes, most visible in mid-summer, sometimes causing leaves to curl or pucker
Likely Causes
- Powdery mildew (Podosphaera aphanis) — thrives in warm days and cool nights, especially with poor airflow
- Overcrowded planting that keeps humidity high around the canopy
What to Do
- 1.Thin canes aggressively — Royalty Purple reaches 6 feet and shades itself out fast, which makes this worse
- 2.Apply a potassium bicarbonate spray (follow label rates) at first sign; it works better as a preventive than a cure
- 3.Avoid overhead irrigation in the evening; drip or soaker hose at the base keeps foliage dry
Frequently Asked Questions
How long does Royalty purple raspberry take to produce fruit?▼
Can you grow Royalty purple raspberries in containers?▼
What's the difference between Royalty and regular red raspberries?▼
Do Royalty purple raspberries spread like red raspberries?▼
When should I plant Royalty purple raspberry canes?▼
Are Royalty purple raspberries good for beginners?▼
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Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.