The Mexican Orange Blossom, scientifically known as Choisya ternata, is a popular evergreen shrub. Its glossy, dark green foliage is aromatic when bruised, releasing a citrus-like scent. Clusters of fragrant, star-shaped white flowers emerge primarily in late spring to early summer, often with a second, smaller flush later in the season. Its low-maintenance nature makes it a valuable garden addition, attracting pollinators like bees and butterflies.
Planting and Establishment
Select an appropriate site for planting Mexican Orange Blossom. This shrub thrives in locations that receive full sun to partial shade; in hotter climates, some afternoon shade can prevent leaf scorching. Adequate drainage is essential, as the plant will not tolerate waterlogged conditions. Well-drained, fertile soil, ideally slightly acidic to neutral, provides the best foundation.
When preparing the planting hole, make it at least twice as wide as the root ball and just as deep. Amending the soil with organic matter like compost can improve structure and fertility. Position the plant in the hole so the top of the root ball is level with the surrounding soil, then backfill gently and water thoroughly to settle the soil. Water regularly until the plant shows signs of new growth and its root system is well-established.
Ongoing Care Requirements
Mexican Orange Blossom thrives in full sun to partial shade, needing at least six hours of direct sunlight daily for best flowering. Full sun suits cooler climates, while warmer regions benefit from morning sun and some afternoon shade. Water newly planted shrubs consistently. Allow the soil to dry out partially between waterings to prevent root rot. Once established, it tolerates drought well, requiring less frequent but deep watering during dry spells to encourage a robust root system.
Apply a layer of organic mulch, such as compost, around the plant’s base annually in early spring to maintain soil health and conserve moisture. Fertilization is not always necessary if the soil is already fertile. However, if needed, a balanced, slow-release fertilizer can be applied in spring as new growth emerges. Avoid over-fertilization, as too much nitrogen promotes leafy growth over blooms and can lead to root burn. Mexican Orange Blossom is hardy in USDA Zones 7 to 10, thriving in mild winters and benefiting from shelter from cold winter winds. Temperatures below 5-10°F can cause defoliation; in colder regions, container planting allows for indoor overwintering.
Pruning for Health and Shape
Pruning Mexican Orange Blossom helps maintain its shape, encourages bushiness, and promotes new growth and blooms. Prune after the first flush of flowers in late spring or early summer. This allows new growth to harden off before winter and encourages a potential second bloom later in the season.
When pruning, remove any dead, damaged, or crossing branches to improve air circulation and overall plant health. To maintain size and shape, trim back up to one-third of the new growth. Avoid severe pruning in winter or early spring, as this removes flower buds formed on old wood, reducing spring blooms. The plant tolerates pruning well, but excessive cutting can disrupt its natural form.
Addressing Common Problems
Mexican Orange Blossom is resistant to serious pests and diseases, but some issues can arise. Yellowing leaves can indicate overwatering or poor drainage, leading to waterlogged soil and root issues. Conversely, drought can also cause leaves to yellow or brown. Nutrient deficiencies, such as a lack of iron, can also cause yellowing. Check soil moisture and consider a balanced fertilizer or compost to resolve these issues.
Lack of blooms can stem from insufficient light, as the plant needs at least six hours of direct sunlight for flowering. Improper pruning, especially cutting back too much old wood before flowering, also reduces bloom production. Nutrient imbalances, such as too much nitrogen, lead to lush foliage but fewer flowers. Adjusting light and ensuring proper fertilization encourages more abundant blooms.
Occasional issues with spider mites or snails can occur. Spider mites cause speckled foliage, and snails chew on leaves. Simple organic methods, such as manual removal or applying barriers like diatomaceous earth, can manage these pests.