OLL-4 Sweet Orange (Citrus sinensis ‘OLL-4’)
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LIMITED AVAILABILITY! OLL-4 is a very special new commercial variety that was grown to be the most green resistant cultivar.
Common Names: OLL-4 Sweet Orange, OLL-4 Orange
Family: Rutaceae
Origin: Developed in Florida, USA
The OLL-4 Sweet Orange (Citrus sinensis ‘OLL-4’) is a highly esteemed orange cultivar known for its outstanding sweetness, juiciness, and excellent flavor. Developed in Florida, this variety has quickly gained popularity among citrus enthusiasts and commercial growers alike. The OLL-4 is celebrated for producing large, seedless, and easy-to-peel oranges that are perfect for fresh eating, juicing, and a variety of culinary uses.
This sweet orange cultivar is similar to but better than Valencia. It is one of the series of OLL (‘Orie Lee Late’) oranges that was developed by the University of Florida and grower/researcher Orie Lee, patented in 2017. It is higher yielding, disease resistant, and with more cold and drought tolerance than standard orange varieties. It can be grown in the garden or in containers.
Distinctive Features and Uses
Fruits: OLL-4 Sweet Oranges are medium to large in size, with a bright orange, smooth skin that is easy to peel. The flesh is seedless, incredibly juicy, and has a rich, sweet flavor with a balanced acidity, making it ideal for fresh eating. The fruit is also perfect for juicing, producing a rich, flavorful orange juice that’s perfect for breakfast or adding to recipes.
Leaves: The tree boasts dark green, glossy leaves that are evergreen, adding a lush, vibrant appearance to any garden or landscape. The foliage is aromatic, releasing a citrus scent when crushed.
Growth Habit: OLL-4 Orange Trees are vigorous growers, typically reaching 10-15 feet in height, making them suitable for both home gardens and commercial orchards. The tree is known for its heavy fruit production, often yielding an abundant harvest in late winter to early spring.
Planting Location and Soil Preparation
Choose a sunny location for your citrus tree that receives at least 8 hours of direct sunlight daily. Well-draining soil is essential to prevent waterlogged roots. If your soil is heavy or clay-like, consider amending it with compost to improve drainage. Citrus trees a particularly high demand for nitrogen.
Planting Your Citrus Tree
Plant your citrus tree any time of the year. Follow these steps:
- Dig a hole that is twice the width of the root ball and just as deep.
- Gently remove the tree from its container and loosen the roots.
- Place the tree in the hole at the same depth it was in the container and backfill with soil.
- Water thoroughly to settle the soil and eliminate air pockets.
Watering
Proper watering is vital for healthy citrus trees. Water deeply and infrequently to encourage deep root growth. During the growing season, water every 1-2 weeks, allowing the top few inches of soil to dry out between waterings. Reduce watering frequency during winter.
Fertilizing
Citrus trees have specific nutritional needs and a particularly high demand for nitrogen. Feed your tree with a balanced citrus fertilizer or a granular fertilizer with an N-P-K ratio of 2:1:1. Apply fertilizer every 6-8 weeks from spring to early fall, reducing or stopping during winter.
Pruning
Regular pruning maintains the shape, health, and fruit production of your citrus tree. Prune to:
- Remove dead or diseased branches.
- Thin out overcrowded growth.
- Open the canopy to sunlight and air circulation.
- Shape the tree for better aesthetics and easier harvesting.
Pest and Disease Management
Keep a close eye on your citrus trees for signs of pests or diseases. Common pests include aphids, scales, and mites. Monitor for citrus-specific diseases like citrus canker and huanglongbing (citrus greening). Use organic pest control methods whenever possible.
Frost Protection
If you live in an area prone to frost, take precautions to protect your citrus trees until they are well-established. Cover them with frost cloth or blankets when frost is expected, and consider moving potted citrus indoors during colder months.
Mulching
Apply a layer of organic mulch around the base of your citrus tree to retain moisture, suppress weeds, and improve soil health. Keep the mulch away from the trunk to prevent rot.
Harvesting Citrus Fruits
Harvest your citrus fruits when they are fully ripe. Different varieties have varying ripening times, usually ranging from several months to a year. Fruits should be firm, fully colored, and easy to detach from the tree. Use pruning shears or a sharp knife to cut the fruit, leaving a small stem attached.
By following this comprehensive growing guide, you'll be well-equipped to nurture healthy and fruitful citrus trees that provide you with a continuous supply of delectable and nutritious citrus delights.
Happy citrus tree growing!
Quick Care Guide
| Plant Type | Evergreen Fruit Tree |
| Harvest Season | Late Winter to Early Spring |
| Mature Size | 10-15 feet tall, 8-10 feet wide |
| Soil & Moisture | Well-draining, sandy loam soil; moderate moisture with good drainage |
| Light Requirements | Full Sun |
| Growth Rate | Moderate |
| Self-fertile | Yes |
| Zone Hardiness | Outdoors 8-11; Patio/Greenhouse 4+ |
| Propagation | Grafted and capable of producing fruit this growing season or in up to 2 years. |
Full Growing Guide
Climate and Soil Requirements
- Climate: OLL-4 Sweet Oranges thrive in warm, sunny climates and are best suited for USDA hardiness zones 9-11. They prefer temperatures between 70-85°F and are somewhat frost-tolerant, but protection is needed during severe cold spells. In cooler climates, they can be grown in containers and brought indoors during the winter.
- Soil: OLL-4 Oranges prefer well-draining, sandy loam soil with a slightly acidic to neutral pH (6.0-7.0). The tree benefits from soil enriched with organic matter, such as compost, to improve fertility and moisture retention while ensuring good drainage.
Planting
- Location: Choose a sunny location that receives at least 6-8 hours of direct sunlight daily. OLL-4 Orange trees thrive in full sun, which is essential for healthy growth and abundant fruit production.
- Soil Preparation: Prepare the soil by loosening it and mixing in compost or organic matter to enhance fertility and drainage.
- Planting Time: Plant in the spring after the last frost, when the soil has warmed up. In warmer regions, fall planting is also suitable.
- Spacing: Space trees 8-10 feet apart if planting in the ground, or use a large container with adequate drainage if growing in pots.
Watering
- Consistent Moisture: Water regularly to keep the soil consistently moist but not waterlogged. OLL-4 Oranges require moderate watering, especially during dry spells, but should not be overwatered.
- Mulching: Apply a layer of mulch around the base to retain moisture, suppress weeds, and regulate soil temperature.
Sunlight and Fertilizing
- Full Sun: Ensure the tree receives at least 6-8 hours of direct sunlight daily for optimal growth and fruit production.
- Fertilizing: Apply a balanced, slow-release fertilizer in early spring to promote healthy growth. Supplement with a citrus-specific fertilizer during the growing season to support fruit development. Fertilize every 6-8 weeks during the growing season for best results.
Pruning and Maintenance
- Routine Pruning: Prune the tree in late winter or early spring to remove dead or damaged branches and to shape the tree. Regular pruning helps to maintain a manageable size and promotes better air circulation and light penetration.
- Maintenance: OLL-4 Orange trees are relatively low-maintenance once established. Keep the area around the tree clear of weeds and debris to prevent pests and diseases.
Pest and Disease Management
- Common Pests: Watch for pests such as aphids, scale, and citrus leafminers. Use insecticidal soap or neem oil to control infestations as needed.
- Diseases: OLL-4 Orange trees are relatively disease-resistant, but proper care will help prevent common issues such as root rot and fungal leaf spots. Ensure good air circulation and avoid overhead watering to minimize disease risk.
Harvesting OLL-4 Sweet Oranges
When to Harvest:
- OLL-4 Sweet Oranges typically ripen from late winter to early spring. The fruit is ready to harvest when it reaches full size, turns bright orange, and is slightly soft to the touch.
How to Use:
- OLL-4 Sweet Oranges are perfect for fresh eating, juicing, or adding to fruit salads and desserts. Their sweet, juicy flavor makes them a delightful addition to many dishes, from breakfast to dessert.
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