Ever dreamt of a fruit that’s as intriguing as it is delicious? Tree tomatoes, also known as tamarillos, offer just that! These vibrant, flavorful fruits, native to the Andes, are a delightful addition to any garden, bringing an exotic touch and a burst of tangy sweetness.
Growing your own tree tomatoes is surprisingly straightforward, even for novice gardeners. With a little attention to their specific needs, you can enjoy a bountiful harvest of these unique fruits. This guide will walk you through every step, from choosing the right variety to harvesting your first ripe tamarillos.
Understanding the Tree Tomato (tamarillo)
The tree tomato, scientifically known as Solanum betaceum, is not a true tomato, nor is it a tree in the botanical sense. It’s actually a fast-growing shrub or small tree that can reach heights of up to 3 meters (10 feet). Its common name, tamarillo, is derived from the indigenous Quechua language, meaning ‘house of the sun’.
These plants are evergreen and produce prolific amounts of fruit, typically oval-shaped and ranging in color from deep red and purple to orange and yellow. The flavor is often described as a cross between a tomato, a passionfruit, and a plum – tangy, slightly sweet, and aromatic. The skin is usually bitter and not eaten, but the juicy flesh is perfect for culinary uses.
Varieties of Tree Tomatoes
While there are many cultivars, the most commonly encountered are:
- Red Tamarillo: The most popular variety, known for its intense red skin and flesh. It has a strong, tart flavor, excellent for savory dishes and jams.
- Yellow/Orange Tamarillo: These varieties tend to be sweeter and less acidic than the red ones. They are often preferred for fresh consumption and desserts.
- Purple Tamarillo: Less common, these offer a rich, deep flavor and are also suitable for various culinary applications.
Getting Started: Planting Your Tree Tomato
Successful tree tomato cultivation begins with selecting the right location and preparing your soil. These plants thrive in warm climates and require protection from frost.
Climate and Site Selection
Tree tomatoes are best grown in subtropical or tropical regions. They prefer temperatures between 15°C and 25°C (60°F and 77°F). While they can tolerate brief dips in temperature, prolonged frost will kill the plant. Therefore, if you live in a cooler climate, consider growing them in pots that can be brought indoors during winter, or in a protected greenhouse.
Choose a location that receives at least 6-8 hours of direct sunlight per day. The site should also be sheltered from strong winds, as the plant’s stems can be brittle and easily damaged. Proximity to a south-facing wall can offer additional warmth and protection.
Soil Preparation
Tamarillos prefer well-drained, fertile soil. They are not overly fussy but will perform best in soil with a pH between 6.0 and 7.0. Before planting, amend the soil generously with organic matter such as compost or well-rotted manure. This will improve drainage, aeration, and nutrient content.
If you have heavy clay soil, consider incorporating sand or perlite to improve drainage. For sandy soils, more organic matter will help retain moisture and nutrients.
Propagation: Seeds vs. Cuttings
You can propagate tree tomatoes from seeds or cuttings. Growing from seeds is the most common method for home gardeners. (See Also: How Big Does Apple Tree Grow )
- From Seeds: Sow seeds indoors about 6-8 weeks before the last expected frost. Use a good quality seed-starting mix and sow seeds about 0.5 cm (1/4 inch) deep. Keep the soil moist and warm (around 20-25°C or 68-77°F). Germination typically takes 10-20 days. Once seedlings have developed a few true leaves, they can be transplanted into larger pots.
- From Cuttings: Take cuttings from a healthy, mature plant during the spring or summer. Cuttings should be about 15-20 cm (6-8 inches) long and have several leaves. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cuttings in a moist, well-draining potting mix and keep them in a warm, humid environment until they have rooted. This method often results in faster fruiting.
Transplanting Seedlings
Once the risk of frost has passed and seedlings are strong enough (usually with 4-6 true leaves and a height of about 15-20 cm or 6-8 inches), they can be transplanted into their permanent garden location. Ensure the soil has warmed up sufficiently. Space plants about 1.5-2 meters (5-6.5 feet) apart to allow for their mature size.
Dig a hole twice as wide and as deep as the seedling’s root ball. Gently remove the seedling from its pot, taking care not to disturb the roots. Place it in the hole so that the top of the root ball is level with the surrounding soil. Backfill the hole with soil, firm it gently, and water thoroughly.
Care and Maintenance for Healthy Growth
Providing consistent care is crucial for a productive tree tomato plant. This includes watering, fertilizing, pruning, and pest management.
Watering
Tree tomatoes require consistent moisture, especially during their establishment phase and when fruits are developing. Water deeply and regularly, particularly during dry periods. Aim to keep the soil consistently moist but not waterlogged. Overwatering can lead to root rot.
A layer of mulch around the base of the plant will help retain soil moisture, suppress weeds, and regulate soil temperature. Ensure the mulch doesn’t touch the stem directly to prevent rot.
Fertilizing
These plants are relatively heavy feeders. Start with a balanced fertilizer (e.g., 10-10-10) in the spring when new growth begins. As the plant matures and starts to flower and fruit, switch to a fertilizer with a slightly higher phosphorus and potassium content to promote fruit development.
Apply fertilizer every 6-8 weeks throughout the growing season. You can also supplement with organic fertilizers like compost tea or fish emulsion. Avoid excessive nitrogen, which can lead to lush foliage at the expense of fruit production.
Pruning
Pruning is essential for maintaining the plant’s shape, encouraging fruit production, and managing its size. Tree tomatoes can become leggy and unmanageable without proper pruning.
- Formative Pruning: In the first year, select one or two strong central leaders and prune away any competing stems to establish a sturdy structure.
- Annual Pruning: Prune back the plant by about one-third to one-half in late winter or early spring before new growth begins. This encourages new, fruitful growth. Remove any dead, damaged, or crossing branches.
- Pinching Back: During the growing season, pinch back the tips of new shoots to encourage bushier growth and more flowering sites.
Remember that tree tomatoes fruit on new growth, so pruning strategically will enhance your harvest. Be cautious not to over-prune, as this can reduce the number of flowers and fruits.
Support
As tree tomatoes grow, they can become top-heavy with fruit, especially when laden. Providing support will prevent branches from breaking and keep the fruit off the ground, reducing the risk of rot and pest damage. (See Also: How To Hang Christmas Tree Ornaments )
Staking is a common method. Install a sturdy stake near the plant when it’s young and tie the main stem to it as it grows. For larger plants, a cage or a system of supports around the branches might be necessary. Ensure the supports are strong enough to bear the weight of mature fruit.
Pest and Disease Management
Tree tomatoes are generally robust, but they can be susceptible to certain pests and diseases.
Common Pests:
- Aphids: Small, soft-bodied insects that cluster on new growth and undersides of leaves. They can be washed off with a strong spray of water or treated with insecticidal soap.
- Whiteflies: Tiny white insects that fly up when disturbed. They weaken the plant by sucking sap. Insecticidal soap or neem oil can be effective.
- Spider Mites: Tiny arachnids that cause stippling on leaves and fine webbing. Increase humidity and use insecticidal soap or neem oil.
- Fruit Flies: Can damage ripening fruit. Use fruit fly traps or cover ripening fruit with fine netting.
Common Diseases:
- Root Rot: Caused by overwatering and poor drainage. Ensure good soil drainage and avoid waterlogged conditions.
- Powdery Mildew: A white, powdery fungal growth on leaves. Improve air circulation and treat with a fungicide or a baking soda solution.
- Verticillium Wilt: A soil-borne fungal disease that causes wilting and yellowing of leaves. There is no cure; affected plants should be removed and destroyed. Prevention is key, starting with healthy soil and avoiding planting in infected areas.
Regular inspection of your plants will help you catch any problems early. Healthy, well-cared-for plants are generally more resistant to pests and diseases.
Harvesting and Using Your Tree Tomatoes
The reward for your efforts is the delicious tree tomato fruit. Knowing when and how to harvest is key to enjoying their best flavor.
When to Harvest
Tree tomatoes typically begin to produce fruit about 1-2 years after planting from seed, and often sooner from cuttings. The fruits mature about 4-8 months after flowering, depending on the variety and climate.
Harvesting is usually done when the fruits have reached their mature color (red, orange, or yellow) and feel slightly soft to the touch, similar to a ripe plum. The skin may also start to develop a slightly glossy sheen. It’s best to harvest them before they are fully ripe on the plant, as overripe fruits can become soft and unappealing.
How to Harvest
Use clean pruning shears or a sharp knife to cut the fruit from the stem, leaving a small piece of stem attached. This helps the fruit store better. Gently place the harvested fruits into a basket or container, taking care not to bruise them.
If you live in a frost-prone area, harvest all mature fruits before the first frost. Even slightly immature fruits will ripen indoors.
Ripening and Storage
Tree tomatoes will continue to ripen after being picked. Place them in a fruit bowl at room temperature, away from direct sunlight. They typically ripen within a few days to a week.
Once ripe, they can be stored in the refrigerator for about a week to 10 days. However, they are best consumed fresh to enjoy their vibrant flavor and texture. (See Also: How To Remove Moss From A Tree )
Culinary Uses
Tree tomatoes are incredibly versatile in the kitchen. Their unique flavor profile makes them suitable for both sweet and savory dishes.
- Fresh Consumption: Slice them in half and scoop out the flesh with a spoon, discarding the bitter skin. They are delicious on their own, added to fruit salads, or blended into smoothies.
- Jams and Preserves: Their tartness makes them ideal for making jams, jellies, and chutneys.
- Sauces and Salsas: They can be used to create tangy sauces or vibrant salsas, adding an exotic twist.
- Desserts: Stewed tree tomatoes, often sweetened with sugar and flavored with spices like cinnamon or ginger, make a wonderful topping for ice cream, yogurt, or pancakes.
- Savory Dishes: In some cuisines, they are used in savory stews or curries, providing a balancing tartness.
When preparing them, the skin is always removed. You can blanch them briefly in hot water to make peeling easier, or simply cut them in half and scoop out the flesh.
Nutritional Benefits
Tree tomatoes are a good source of vitamins, particularly Vitamin A and Vitamin C, as well as dietary fiber. They also contain antioxidants, which are beneficial for overall health.
Troubleshooting Common Issues
Even with the best care, you might encounter some challenges. Here are a few common issues and how to address them.
Yellowing Leaves
Yellowing leaves can be a sign of several issues:
- Nutrient Deficiency: If the yellowing is uniform across the leaf and new growth is stunted, it might indicate a lack of nitrogen or other essential nutrients. Fertilize with a balanced fertilizer.
- Overwatering/Underwatering: Both can cause yellowing. Check soil moisture levels and adjust watering accordingly.
- Pests: Heavy infestations of aphids or spider mites can cause leaves to yellow and drop. Inspect plants for pests and treat as needed.
- Disease: Verticillium wilt can cause one-sided yellowing and wilting. If suspected, remove the plant.
Poor Fruit Set
Several factors can contribute to a lack of fruit:
- Insufficient Sunlight: Tree tomatoes need plenty of sun to flower and fruit. Ensure they are in a sunny location.
- Improper Pruning: Pruning too late in the season or removing too much new growth can reduce fruiting.
- Nutrient Imbalance: Too much nitrogen can promote leafy growth at the expense of flowers. Use a fertilizer lower in nitrogen during the fruiting season.
- Pollination Issues: While many tree tomato varieties are self-pollinating, cross-pollination can sometimes improve fruit set. Planting multiple trees or attracting pollinators like bees can help.
- Extreme Temperatures: Very high or very low temperatures can affect flowering and fruit set.
Brittle Stems
The stems of tree tomatoes can be brittle, especially when young or when heavily laden with fruit. This is why wind protection and support are so important. Ensure consistent watering, as drought stress can also make stems more prone to breaking.
Strong winds can snap stems. If this happens, try to prop up the broken stem with tape or ties. For significant breaks, you may need to prune the plant back to encourage new, stronger growth.
Conclusion
Embarking on the journey of how to grow tree tomatoes, or tamarillos, promises a rewarding experience for any gardener. From selecting a sun-drenched, sheltered spot and preparing nutrient-rich, well-drained soil to consistent watering, balanced feeding, and strategic pruning, each step contributes to a thriving plant. By understanding their needs and attentively managing potential pests and diseases, you’ll soon be harvesting these unique, tangy fruits. Their versatility in the kitchen, from vibrant salsas to delicious jams, ensures they are more than just a garden curiosity, but a true culinary delight.
