Corynocarpus laevigatus, commonly known as the New Zealand laurel or karaka, is a flowering plant native to New Zealand that belongs to the family Corynocarpaceae. This plant can grow up to 20 meters tall, showcasing glossy, dark green leaves that are leathery, oval-shaped, and pointed at the tip. In spring, it produces small white flowers, which are followed by orange-yellow fruit in the summer.
The karaka tree holds significant cultural importance for the Maori people of New Zealand, who have used it for food, medicine, and building materials for centuries. While the fruit of the tree is edible, it contains toxins that must be carefully removed to avoid harm.
Beyond its cultural importance, Corynocarpus laevigatus is highly valued as an ornamental tree due to its attractive foliage and its ability to withstand coastal conditions. It thrives in well-drained soil with full sun or partial shade but can also adapt to wetter environments.
Overall, Corynocarpus laevigatus is a vital plant species offering both cultural and ornamental value, greatly contributing to New Zealand's floral biodiversity.
New Zealand laurel has good resistance to disease and is generally not prone to illnesses. As for care, this plant is fairly low-maintenance. When grown outdoors it needs minimal watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they have finished blooming. New Zealand laurel is suitable for anyone with outdoor space, such as a garden or deck, and does not demand a lot of gardening experience.
How to keep Corynocarpus Laevigatus.
Light
The New Zealand laurel does well with abundant light but can also tolerate situations where sunlight is somewhat reduced. Its native growing conditions mirror this, suiting both fully exposed and partly shaded locations. Excessive or insufficient sunlight can undermine the plant's vigour, possibly causing weak growth and paler leaf colour.
Water
Originating from coastal regions, the New Zealand laurel thrives in moderate climates with consistent moisture and well-drained soil. Once established, it becomes drought-resistant and only needs watering every 1-2 weeks. As an evergreen, the New Zealand laurel retains its foliage year-round and requires less water during cooler months when its growth slows down.
Temperature
In its native habitat, the new Zealand laurel prefers temperatures of 68 to 105 ℉ (20 to 41 ℃). In winter it can tolerate lows of 32 ℉ (0 ℃), but maintaining temperatures above 50 ℉ (10 ℃) is advised to avoid frost damage. In summer, providing some shade is recommended because excessive heat can cause leaf burn and slow growth.
Fertilizer
Fertilizing is essential for the care of New Zealand laurel. Consistent feeding during the growing season maintains the energy required for its showy foliage and supports overall growth. Failing to provide fertilizer can lead to unhealthy leaves, reduced ornamental value, and stunted or weak growth that is more susceptible to breaking.
Pruning
The New Zealand laurel has glossy green leaves and benefits from being pruned between early and late winter. Pruning helps maintain its shape, encourages healthy growth, improves air circulation, and enhances its ornamental appeal. It also reduces the risk of disease. For specific pruning techniques, consult gardening resources.
Pot & Repot
When repotting New Zealand laurel, select a pot 1-2 inches (2.5–5.1 cm) larger with ample drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball sits slightly below the rim of the flower pot. Water thoroughly after repotting and place in a warm spot with indirect sunlight.
Botanical profile.
- Plant Type
- Tree
- Life Cycle
- Perennial
- Genus
- Corynocarpus
- Family
- Corynocarpaceae
- Hardiness Zone
- 10-13
- Mature Height
- 14.94 m
- Mature Spread
- 7.92 m
- Leaf Color
- Green
- Leaf Type
- Evergreen, Deciduous
- Flower Color
- Yellow, Pink, Green
- Flower Size
- 0.51 cm to 0.51 cm
- Bloom Time
- Mid fall, Late fall, Early winter
- Planting Time
- Spring, Summer
- Harvest Time
- Late winter, Early spring, Mid spring
Other names.
Reader questions.
How should I water my New Zealand laurel?
When it comes to watering your New Zealand laurel, you have flexibility in choosing the watering tool. Whether you use a watering can, hose, or cups, all will effectively moisten the plant's soil. Regardless of the tool, the key is to water the soil directly and ensure equal moisture distribution to all areas for the root system to benefit. Considering filtered water is recommended to avoid potential harmful particles found in tap water. Additionally, using water at room temperature or slightly warmer is preferable as extreme temperatures can shock the New Zealand laurel. Nevertheless, this plant generally responds well to any water you give it.
Why should I put fertilizer on my New Zealand laurel plant?
New Zealand laurel needs regular fertilization because its showy leaves require a lot of energy to produce and maintain. The challenge is that besides supporting leaf health, the plant must also find enough energy for the growth of its stems, roots, branches, and other vital structures. Neglecting fertilization could lead to two likely outcomes. Firstly, the leaves may lose their natural color and texture, appearing unhealthy and negatively impacting the plant's ornamental appeal. Secondly, the overall growth of the plant may slow down or produce weak growth that could easily break.
What are the sunlight requirements for New Zealand laurel?
The New Zealand laurel needs a significant amount of light to thrive, preferring conditions that simulate its natural habitat. This includes full sun exposure, defined as more than 6 hours of sunlight daily, or partial sun, receiving about 3-6 hours of sunlight. Despite its requirement for abundant light, the New Zealand laurel can also endure environments with diluted sunlight. It's important to watch how sunlight moves through your garden to ensure you choose locations that provide the right balance of light and shade, thereby ensuring the plant's wellbeing. Remember, both overexposure and insufficient sunlight can hinder the plant's vigor, potentially resulting in weak growth and fading leaf color.
What are the ideal temperature conditions for New Zealand laurel?
The New Zealand laurel, or Corynocarpus laevigatus, thrives in temperatures ranging from 68 to 105°F (20 to 41°C) in its native growth environment. During winter, it's capable of withstanding temperatures as low as 32°F (0°C), but for optimal growth, keeping it above 50°F (10°C) is advisable to prevent frost damage. In summer, providing some shade is recommended to protect the plant from excessive heat that may cause leaf burn and reduce growth. The plant is extremely heat-loving, so colder temperatures can be harmful. In autumn, it's beneficial to bring outdoor-grown New Zealand laurel indoors, placing it near a bright window but at a distance from heaters, to maintain temperatures conducive to its growth.
What do I need to do if I give my New Zealand laurel plant too much or too little water?
Outdoor plants, especially newly planted ones or seedlings, are susceptible to lack of watering. Remember to water them adequately for the first few months while the tree is still small or recently planted. Once the roots are established, New Zealand laurel can generally rely on rain for hydration. If your New Zealand laurel is in a pot, overwatering is more likely. If you accidentally overwater your plant, take immediate action to fix the issue. Stop watering the plant right away to minimize the effects of overwatering. Then, remove the plant from its pot to inspect its roots. If there are no signs of root rot, you can return the plant to its container. However, if root rot is present, trim any affected roots and consider applying a fungicide to prevent further damage. Lastly, repot the New Zealand laurel using well-draining soil. In the case of underwatering, simply water the New Zealand laurel more frequently. This is an easy fix, as the plant's leaves will droop, dry out, and fall off when underwatered. They will quickly regain their fullness after sufficient watering. It is important to adjust your watering frequency as soon as you notice signs of underwatering.
When should I fertilize my New Zealand laurel for the best results?
To help your New Zealand laurel thrive, occasional feedings are recommended. There is no need to establish a strict feeding schedule when planting this type of plant. One convenient way to fertilize is by applying fertilizer when watering occasionally. For optimal growth, ensure your New Zealand laurel receives an ample amount of water during the growing season. Feeding once every two to three weeks should be maintained throughout the period of new growth.
How can artificial lighting be used for New Zealand laurel?
In conditions where natural sunlight is insufficient, such as during winter or in less sunny spaces indoors, artificial lighting becomes a crucial solution for maintaining the health and growth of New Zealand laurel plants. Effective use of artificial lights, especially LED lights, can mimic natural sunlight by providing the specific wavelengths needed by plants. For optimal growth under artificial light, full sun plants require 30-50W/sq ft, partial sun plants need 20-30W/sq ft, and full shade plants should have 10-20W/sq ft. The artificial light source should be placed 12-36 inches above the plant, and the lighting should be maintained for 8-12 hours per day to simulate the length of natural daylight.
How can you protect New Zealand laurel from low temperature damage?
To protect New Zealand laurel from low temperature damage, it's vital to keep the plant in environments warmer than its minimum tolerance levels. During winter months, ensuring the plant's surroundings remain above the critical temperature threshold helps avoid frost damage. If frost damage occurs, characterized by leaf color lightening and eventually turning brown or black with wilting and drooping symptoms, immediate action is required. Damaged parts of the plant should be trimmed off. The plant should then be moved indoors to a warm environment, ideally near a south-facing window for ample sunlight, while avoiding placement near heaters or air conditioning vents to prevent air dryness.
How often do I need to water my New Zealand laurel plant?
To ensure the healthy growth of most outdoor plants, they usually rely on rainfall. However, if your area doesn't get enough rain, you'll need to water them regularly. During the spring and fall, watering every 2 weeks should be enough, but in the summer, you'll need to water more frequently. In winter, as plants grow slower and require less water, you should water them sparingly, or not at all. Young or newly planted New Zealand laurel plants need more frequent watering to help them establish and grow into drought-tolerant plants. When it comes to potted New Zealand laurel plants, there are two main ways to determine how often to water them. The first way is to follow a fixed watering schedule, which could be once a week or once every other week. However, this approach may not always work because it doesn't consider the specific growing conditions for your plant. Watering frequency should also be adjusted based on the season. During the summer, when the plant's water needs are highest, a fixed watering schedule may not be enough. Alternatively, you can determine when to water by checking the soil moisture. Typically, it's best to wait until the top two to four inches of soil, about ⅓ to ½ the depth of the pots, have completely dried out before giving more water.
When is it not a good idea to fertilize my New Zealand laurel plant?
For most of the year, you can fertilize your New Zealand laurel regularly. This includes the active growing season of spring, summer, and early fall. However, in winter, you should not fertilize the plant. This is because the New Zealand laurel enters a dormant growth phase during that time. In this phase, the plant either does not produce new growth or only a little. Since there is less active growth, the plant uses less energy and does not require fertilizer.
What are the symptoms of light deficiency in New Zealand laurel?
When New Zealand laurel is cultivated indoors or under insufficient light conditions, several symptoms can indicate light deficiency. These include the development of small and lighter-colored new leaves, leggy or sparse growth, accelerated leaf drop, and slower or halted growth. These symptoms suggest that the plant is conserving its resources or entering survival mode due to inadequate light. Chlorosis and sunscald are additional symptoms to be wary of, indicating stress from excessive sunlight or light deficiency. Leaf curling, wilting, and scorching are defense mechanisms or signs of damage from inappropriate light exposure. Identifying these symptoms early allows for prompt intervention to rectify the light conditions for the plant.
What steps should be taken if New Zealand laurel experiences high temperature stress?
For New Zealand laurel dealing with high temperature stress, ensuring the plant is kept below its maximum temperature tolerance during summer is essential. Exceeding these temperatures can cause the leaves to lighten in color and increase susceptibility to sunburn. To mitigate this, sunburned and dried-up parts of the plant should be trimmed away. The plant should be relocated to an area with shade during the midday and afternoon sun to avoid further heat stress. Additionally, watering the plant in the morning and evening helps keep the soil moist and supports the plant's recovery and growth in high temperatures.