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Growing Inspiration
Inspiration for future Agardeni growing environments.
edibleFamily: RosaceaeGenus: Rubus
Cultivar
Prime-Ark Horizon Blackberry
Rubus 'Prime-Ark Horizon'
Cultivar: Prime-Ark Horizon
Prime-Ark Horizon is a vigorous, thorny blackberry variety known for producing high-quality, large-sized berries with a classic, sweet flavor. The plants exhibit a strong, productive growth habit that requires support, such as a trellis or fence, to manage its spreading canes. Ideal for home orchards and garden patches, this cultivar offers consistent yield and is well-suited for both fresh eating and processing. Its reliable fruiting and sturdy nature make it a favored selection for berry enthusiasts.
Prime-Ark Horizon is a productive, thorny blackberry cultivar valued for its large, flavorful fruit and robust growth habit. It is an excellent choice for home gardeners looking for a consistent and reliable summer berry harvest.
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18-plant pack · Ship
$89.74per pack
$89.74 total
144 plants available · max 8 packs
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Orders generally ship within 3–7 days after purchase. Agardeni gives priority to USPS Priority Mailfor standard live-plant shipments when practical.
USPS Priority Mail typically has a 2–3 day delivery objective after shipment, but delivery times are not guaranteed.
Weather & Temperature Risk
Agardeni ships from Florida and does not monitor destination temperatures nationwide. Customers are responsible for considering local weather conditions and retrieving packages promptly after delivery.
Agardeni is not responsible for plant damage caused by freezing temperatures, frost, excessive heat, or prolonged exposure to extreme temperatures at the destination.
Inspect live plants promptly after delivery. Eligible plant-condition claims must be submitted within 48 hours of confirmed delivery.
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Cultivar Story
Start with Inspiration. Grow Your Aspiration.
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Marketplace Plant
A realistic representation of the starter plants offered in 18, 36, and 72 plant quantities.
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Aspirational Garden
Grow your aspirational plan into an inspirational garden.
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Plant Detail
A closer look at the fruit, flower, foliage, or mature defining characteristics of this cultivar.
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Repotting / Start Growing
Begin with a starter plant and establish it in a larger pot using quality potting soil with beneficials and fertilizer.
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Start · Plan · Grow
Start with real plants. Plan with current marketplace availability. Grow your aspirational garden.
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Plant Profile
Grow Prime-Ark Horizon Blackberry with confidence
Key growing information first, with the complete reviewed cultivar profile available when you want it.
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Sun
Full sun for optimal fruit production and plant vigor.
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Water
Consistent moisture is necessary, especially during flowering and fruit development; avoid waterlogging.
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Mature size
4 to 6 feet tall, spreading 4 to 6 feet wide.
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Hardiness
5-9
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Growth habit
Upright to arching, thorny, trailing canes.
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Plant type
Fruiting Shrub
View Plant Data
Care, size, flowering, climate, soil, health, and additional reviewed data.
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View Plant Data
Care, size, flowering, climate, soil, health, and additional reviewed data.
Good to know
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Growing note
Requires a sturdy trellis or support system as it is a thorny variety with vigorous, arching canes. Proper air circulation and consistent pruning are essential for berry quality and disease prevention.
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Climate note
Requires sufficient winter chill hours for optimal production; generally hardy within specified zones.
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Flower / fruit
Produces large, dark-colored, flavorful berries in mid-summer. Requires bees or other pollinators for successful fruit set.
Growing & Care
Everyday care, growth, feeding, and pruning guidance.
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Growing & Care
Everyday care, growth, feeding, and pruning guidance.
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Sun / light
Full sun for optimal fruit production and plant vigor.
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Growth rate
Moderate to fast.
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Fertilizer
Apply balanced fertilizer in early spring; supplement with organic matter annually to maintain soil health.
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Pruning
Prune out old, dead, or diseased wood after harvest. Canes that fruited should be removed to encourage new growth for the next season.
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Care notes
Requires a sturdy trellis or support system as it is a thorny variety with vigorous, arching canes. Proper air circulation and consistent pruning are essential for berry quality and disease prevention.
Size & Habit
How the plant grows and the space it needs at maturity.
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Size & Habit
How the plant grows and the space it needs at maturity.
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Mature size
4 to 6 feet tall, spreading 4 to 6 feet wide.
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Growth habit
Upright to arching, thorny, trailing canes.
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Spacing
4 to 6 feet apart between plants.
Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
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Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
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Flowering / fruiting
Produces large, dark-colored, flavorful berries in mid-summer. Requires bees or other pollinators for successful fruit set.
Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
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Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
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Hardiness zones
5-9
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Temperature
Requires sufficient winter chill hours for optimal production; generally hardy within specified zones.
Soil & Water
Moisture, drainage, soil, and pH preferences.
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Soil & Water
Moisture, drainage, soil, and pH preferences.
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Watering
Consistent moisture is necessary, especially during flowering and fruit development; avoid waterlogging.
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Soil
Well-draining, rich, organic, slightly acidic soil; tolerant of various textures if drainage is sufficient.
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Soil pH
5.5-6.5
More Plant Data
19 additional reviewed fields from this Plant.id.
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More Plant Data
19 additional reviewed fields from this Plant.id.
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Container Growing
Possible in very large containers or half-wine barrels with heavy-duty support, though best suited for in-ground garden beds.
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Family
Rosaceae
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Foliage Look
Dark green, textured, compound serrated leaflets.
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Foliage Rules
Leaves are alternate and usually compound with three to five leaflets, serrated margins, and visible veining.
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Fruit Flower Look
White, five-petaled flowers followed by clusters of plump, dark purple-black berries.
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Fruit Flower Rules
Fruit should appear in clusters. Juvenile plants will not have fruit or flowers.
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Growth Habit Rules
Do not depict as a tree; maintain an arching, cane-like structure. Do not omit thorns in descriptive representations.
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Mature Plant Look
A vigorous, arching mass of thorny canes with clusters of dark, glossy berries.
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Mature Stage Morphology
Woody canes with prominent thorns, trifoliate green leaves, white flowers, and cluster-borne black fruit.
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Morphology Rules
Focus on the cane structure and trifoliate leaves; thorns are a defining trait.
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Plant Faqs
How much space does a Prime-Ark Horizon blackberry need? They grow best when spaced 4 to 6 feet apart to allow for proper airflow and cane management. Does this blackberry need a trellis? Yes, as a vigorous, thorny variety, it requires a trellis or wire support to keep the arching canes upright and productive. When do I prune these blackberries? Prune out the old canes that have already fruited in late summer or winter to make room for new growth next season.
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Root Look
Healthy, fibrous, light-colored roots filling the starter plug.
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Soil Look
Dark, rich, well-draining garden loam.
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Starter Stage
Small, tender herbaceous starter plug with developing leaves and roots.
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Starter Stage Morphology
Young, trifoliate leaves with small, developing thorns and a healthy white root system.
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Video Voiceover Script
Welcome to Agardeni, where inspiration for gardening helps us imagine how and where we will grow Prime-Ark Horizon Blackberry. This is Prime-Ark Horizon Blackberry, available as 18, 36, and 72 plant starter trays through the Agardeni Marketplace. Let Prime-Ark Horizon become part of your aspirational plan, helping you imagine the future edible garden you want to create. These thorny canes produce large, sweet, dark fruit that is perfect for fresh harvests straight from your own backyard. Establish your starter by repotting it into a four inch pot with quality, well-draining potting mix, then move it to a final in-ground location when ready. Find your inspiration with Agardeni. Explore real plants and real availability. Start. Plan. Grow.
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Youtube Tags
Prime-Ark Horizon Blackberry Rubus Edible Garden Fruit Growing Berry Patch Thorny Blackberry Agardeni Garden Inspiration Home Orchard
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Youtube Video Summary
Prime-Ark Horizon is a productive, thorny blackberry cultivar perfect for home growers looking for large, sweet fruit. Discover how to support and care for these vigorous canes to enjoy a consistent summer harvest.
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Youtube Video Title
Growing Prime-Ark Horizon Blackberries
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