The Kiowa blackberry is renowned for producing some of the largest fruits in the bramble family. If you’re looking for a high-yielding, robust berry for your garden, the kiowa blackberry is a top contender worth considering.
This variety stands out for its impressive size and extended harvest season. We’ll cover everything you need to know to grow them successfully.
From planting to pruning, you’ll get clear, actionable advice.
Kiowa Blackberry
Developed by the University of Arkansas, the Kiowa is a thorny, erect blackberry cultivar. It was released in 1996 and quickly gained popularity among commercial growers and home gardeners alike. Its primary claim to fame is its fruit size, often reaching lengths of over two inches and weights of up to 15 grams.
Beyond just size, it offers a classic sweet-tart blackberry flavor that is excellent for fresh eating, jams, and baking. The plants are known for their vigor and strong disease resistance, making them a durable choice for many climates. They fruit on floricanes, meaning second-year canes produce the berries.
Plant Characteristics And Growth Habits
Understanding the growth pattern of Kiowa blackberries is key to managing them. They are erect, meaning they grow upright, but they still benefit from a trellis system for support, especially when laden with fruit.
The canes are stout and covered with significant thorns, so handling requires care. In the spring, the plants produce attractive white flowers that develop into the massive berries.
Canes and Fruiting Wood
Kiowa plants have a biennial cane cycle. First-year canes, called primocanes, grow vegetatively. They do not produce fruit. In their second year, these same canes become floricanes. They develop lateral branches that flower and fruit.
After fruiting, the floricanes die and should be removed. This cycle means you will always have both primocanes and floricanes present in a mature, well-managed patch.
Ideal Climate And Growing Conditions
Kiowa blackberries are adaptable but thrive best in certain conditions. They are well-suited to USDA hardiness zones 5 through 9. They require a period of winter chill to set fruit properly, but they also need a long, warm growing season to develop their large berries.
They perform poorly in extreme, consistent heat without adequate water. Areas with humid summers should ensure good air circulation to prevent fungal diseases, even though Kiowa has good resistance.
Sunlight and Soil Requirements
For the best fruit production and plant health, provide your Kiowa blackberries with full sun. This means at least 6 to 8 hours of direct sunlight daily. Less sun will result in fewer berries and weaker growth.
The soil should be well-draining and rich in organic matter. A slightly acidic pH between 5.5 and 6.5 is ideal. Heavy clay soils can be amended with compost to improve drainage and fertility.
Planting Your Kiowa Blackberries
Proper planting sets the stage for years of productive harvests. The best time to plant bare-root Kiowa blackberries is in early spring, as soon as the ground can be worked. Container-grown plants can be planted in spring or early fall, allowing the roots to establish before extreme weather.
Step-By-Step Planting Guide
Follow these steps to ensure your blackberries get a great start.
- Choose the Right Location: Select a site with full sun and good air movement. Avoid low spots where frost or water might settle.
- Prepare the Soil: Work the soil to a depth of 12-18 inches. Mix in generous amounts of well-rotted compost or aged manure. A soil test can help you determine if you need to adjust the pH.
- Space the Plants: Because Kiowa is a vigorous, erect variety, space plants about 4 to 5 feet apart within the row. Rows should be spaced 8 to 10 feet apart to allow for easy access and air flow.
- Plant at the Correct Depth: Dig a hole wide and deep enough to accommodate the root system. For bare-root plants, look for the soil line mark on the cane and plant at that depth. For potted plants, plant at the same depth they were in the container.
- Backfill and Water: Gently backfill the hole, firming the soil around the roots. Water thoroughly to settle the soil and eliminate air pockets.
- Mulch: Apply a 3-4 inch layer of organic mulch, like wood chips or straw, around the base of the plant. Keep the mulch a few inches away from the canes themselves to prevent rot.
Essential Trellising Systems
While Kiowa blackberries are erect, a simple trellis prevents canes from arching over under the weight of the fruit. It also keeps the planting tidy and makes harvesting easier. A basic two-wire trellis is very effective.
- Set sturdy posts at each end of the row and every 15-20 feet in between.
- Attach one wire at about 3 feet high and a second wire at 5 to 6 feet high.
- As the primocanes grow, you can loosely tie them to the wires for support. The floricanes will be more easily managed and kept off the ground.
Caring for Your Plants
Consistent care throughout the growing season is what leads to those legendary large berries. The main tasks involve watering, feeding, and weed control.
Watering And Fertilization Schedule
Blackberries need consistent moisture, especially during fruit development and in the first year after planting. Aim for about 1 to 2 inches of water per week, either from rainfall or irrigation. Drip irrigation is ideal as it delivers water directly to the roots and keeps foliage dry, reducing disease risk.
Fertilize your Kiowa blackberries in early spring as new growth begins. Use a balanced fertilizer, such as a 10-10-10 formula. A second, lighter application can be made after harvest to help the primocanes grow strong for next year’s crop. Always follow soil test recommendations for the most accurate feeding.
Weed And Pest Management
Keep the area around your blackberries free of weeds, which compete for water and nutrients. The mulch you applied at planting will help significantly. Hand-pull any weeds that appear, being careful not to disturb the shallow roots of the blackberry plants.
Common pests include Japanese beetles, spider mites, and raspberry crown borers. Diseases to watch for include anthracnose and powdery mildew. Kiowa has good resistance, but monitoring is key.
- Inspect plants regularly for signs of trouble.
- Remove and destroy any diseased canes immediately.
- For insect pests, horticultural oils or insecticidal soaps can be effective controls when applied according to label directions.
Pruning and Training for Maximum Yield
Pruning is the most important annual task for maintaining healthy, productive Kiowa blackberry plants. It seems counterintuitive, but strategic cutting leads to more and better fruit.
Annual Pruning Steps
Pruning is a two-part process: once in late winter/early spring and again immediately after harvest.
- Late Winter Pruning (for Floricanes): Before new growth starts, examine the floricanes (the second-year canes that will fruit this summer). Tip them back to about 4-5 feet in height to encourage lateral branching. Also, remove any canes that are clearly damaged or diseased.
- Summer Pruning (After Harvest): As soon as you have finished picking berries from a floricane, cut that entire cane down to the ground. It will not fruit again. Removing it opens up space and light for the new primocanes.
- Thinning Primocanes: In early summer, you may have an overabundance of new primocanes. Thin them to leave the 4-6 strongest, healthiest canes per plant. This directs the plant’s energy into producing robust canes for next year’s fruit.
Training Methods For Erect Canes
Training goes hand-in-hand with pruning. For Kiowa, the goal is to keep the floricanes and primocanes separate to reduce disease and make harvesting simple. One common method is the “hill system,” where each plant is treated individually, and canes are fanned out and tied to the trellis wires.
Another approach is to train the primocanes to grow up the center of the row, while the floricanes are tied to the wires on either side. This physical separation is very effective.
Harvesting and Storing Your Bounty
The moment you’ve been waiting for—harvesting those giant berries. Kiowa blackberries have a relatively long season, often producing for 5 to 6 weeks from early to mid-summer.
When And How To Pick
Blackberries do not continue to ripen after they are picked. You must wait until they are fully ripe. A ripe Kiowa blackberry will be a deep, glossy black, and the plug (the core) will come away with the berry easily when picked. If you have to tug, it’s not ready.
Harvest in the cool of the morning if possible. Gently place the berries into shallow containers to avoid crushing them. Due to their large size, they can be more fragile than smaller varieties, so handle with care.
Preserving Your Harvest
Kiowa blackberries are fantastic fresh, but you’ll likely have plenty to preserve.
- Refrigeration: Fresh berries will keep in the refrigerator for about 3-5 days. Do not wash them until just before you plan to use them.
- Freezing: For long-term storage, freezing is excellent. Spread washed and dried berries in a single layer on a baking sheet. Freeze until solid, then transfer to airtight freezer bags. They’ll keep for up to a year.
- Canning and Jams: Their high pectin content and bold flavor make Kiowa berries perfect for jams, jellies, and syrups. They also hold their shape well in pies and cobblers, which can be assembled and frozen before baking.
Common Problems and Solutions
Even with a resilient variety like Kiowa, issues can arise. Here’s how to identify and address the most common problems.
Disease Issues
Prevention is the best cure for plant diseases. Ensure proper spacing, pruning for air circulation, and avoiding overhead watering.
- Orange Rust: This is a systemic disease. Infected plants have bright orange spores on the undersides of leaves in spring. There is no cure; you must dig up and destroy the entire plant, roots and all, to prevent spread.
- Anthracnose: Shows as grayish-white spots with purple margins on canes and leaves. Prune out and destroy infected canes. Fungicide applications in early season may be necessary in humid climates.
- Powdery Mildew: A white, powdery coating on leaves. Improve air flow and consider applying a sulfur-based fungicide if the problem is severe.
Animal And Bird Pressure
Birds, deer, and rodents love blackberries. For birds, netting is the most effective solution. Install the netting just before the berries begin to ripen, securing it tightly to the trellis to prevent birds from getting tangled.
For deer, a physical fence is often required. For smaller rodents, keeping the area clean of debris and using approved repellents can help.
Frequently Asked Questions
How Big Do Kiowa Blackberries Get?
Kiowa blackberries are consistently among the largest blackberries available. Individual berries can regularly reach over 2 inches in length and weigh up to 15 grams, sometimes more. Their size is a major distinguishing feature.
Are Kiowa Blackberries Thornless?
No, Kiowa blackberries are a thorny variety. The canes have significant, sharp thorns. This is an important consideration for gardeners with small children or who prefer easier handling. Always wear thick gloves and long sleeves when pruning or harvesting.
What Is The Difference Between Kiowa And Triple Crown Blackberries?
Kiowa is a thorny, erect variety known for its extremely large fruit size and extended harvest season. Triple Crown is a thornless, trailing variety known for its exceptional sweet flavor and high productivity. Kiowa is more cold-hardy, while Triple Crown is semi-erect and requires a different trellising approach.
How Long Does It Take For Kiowa Blackberries To Produce Fruit?
You can expect a small harvest in the second year after planting. The plants will reach full production in their third or fourth year. Remember, only the second-year canes (floricanes) produce fruit, so patience in the first year is essential while the primocanes establish.
Can You Grow Kiowa Blackberries In Containers?
It is possible but not ideal due to the plant’s vigorous, large size. If you attempt it, choose a very large container (at least 20 gallons) with excellent drainage. Use a high-quality potting mix and be diligent about watering and fertilizing, as container plants dry out and deplete nutrients faster. A dwarf or trailing variety might be a better choice for container gardening.
Growing Kiowa blackberries is a rewarding project for any gardener seeking impressive yields of giant, flavorful fruit. With their robust nature and extended harvest window, they offer a great return on your investment of time and space. By providing the right conditions, following a consistent pruning schedule, and managing potential problems proactively, you can enjoy these remarkable berries for many seasons to come. Remember to start with well-prepared soil, provide sturdy support, and be patient as the plants establish their root system. The effort you put in will be well worth it when you’re harvesting basketfuls of the largest blackberries you’ve ever seen.