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Yellow oleander

How to identify Yellow oleander (Cascabela thevetia)

Yellow oleander, also known as Milk tree

Yellow oleander is characterized by its stature as an evergreen shrub or small tree, which can grow to an impressive 8 feet (2.4 meters) with a spread of about 4 feet (1.2 meters). It features glossy, lance-shaped leaves that contribute to its tropical appearance. Its signature bell-shaped flowers bloom in a vibrant yellow and are key identifiers among plant enthusiasts. The fruit is a heart-shaped drupe, adding to its aesthetic appeal.

Lifespan

Lifespan: Perennial

Plant Type

Plant Type: Shrub, Tree

Leaf Type

Leaf Type: Evergreen

Quickly Identify Yellow oleander

1

Large, funnel-shaped flowers in vibrant yellow to apricot hues, blooming in terminal clusters.

2

Transitioning fruit from green to black, with a triangular shape and two nut-like kernels.

3

Linear-lanceolate leaves with a waxy texture, spiral arrangement, and glossy appearance.

4

Stem starting green, maturing to silver-gray, moderately thick, and symmetrical branching pattern.

5

Evergreen shrub or small tree reaching 8 feet (2.4 meters) with lance-shaped glossy leaves.

Yellow oleanderYellow oleanderYellow oleanderYellow oleanderYellow oleander

Detailed Traits of Yellow oleander

Leaf Features

The leaves of yellow oleander are willow-like and linear-lanceolate, ranging from 6 to 7 inches (15 to 18 cm) in length and 0.2 to 0.4 inches (0.5 to 1 cm) in width. These glossy green leaves have a distinctive midrib and are closely spaced in a spiral arrangement along the stem. The waxy texture minimizes water loss, making them well-suited for various environments. Their linear shape, length, and spiral arrangement are key features for identifying yellow oleander.

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Flower Features

Yellow oleander's flowers are large, funnel-shaped, and vibrant yellow to apricot in color. Measuring about 3 inches (7.5 cm) in length and 1 to 1.5 inches (2.5-4 cm) in width, these fragrant flowers form terminal clusters known as cymes. They bloom from summer to fall, with each flower lasting a single day, opening in the morning and closing by afternoon. The flowers' sweet scent and distinct shape make them a key feature for identifying yellow oleander.

Yellow oleander Flower imageYellow oleander Flower image
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Stem Features

The stem of yellow oleander is initially green, transforming to a distinguished silver-gray with age. Typically smooth and cylindrical, it can grow up to 6 feet (183 cm) in height and features a moderately thick structure. The branching pattern is fairly symmetrical, with lateral branches arising at regular intervals, giving the plant a balanced appearance. Juvenile stems are tender and pliable, while mature ones become woody and rigid. The surface remains relatively smooth, lacking significant texture variations.

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Fruit Features

The fruit of yellow oleander transitions from green to black as it matures, developing a soft and juicy texture akin to a plum. Each roughly triangular fruit measures about 1.2 - 1.8 inches (3 - 4.5 cm) across. Inside, a hard stone encases typically two nut-like kernels, which rest within the mature, fleshly fruit. The stark color shift upon ripening, from vibrant green to deep black, coupled with its distinctive shape, marks its readiness for dispersion.

Yellow oleander Fruit imageYellow oleander Fruit image
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Key Facts About Yellow oleander

Attributes of Yellow oleander
Lifespan
Perennial
Plant Type
Shrub, Tree
Plant Height
1.8 m to 2.5 m
Flower Color
Yellow
White
Orange
Gold
Fruit Color
Red
Black
Stem Color
Green
Silver
Leaf type
Evergreen
The Toxicity of Yellow oleander
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Scientific Classification of Yellow oleander

Family
Dogbane
Icon allow
Species
Yellow oleander (Cascabela thevetia)
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Distribution Map of Yellow oleander

Yellow oleander naturally thrives in tropical regions of Central and South America. It has been introduced to various continents, often in tropical and subtropical climates. This plant's distribution has also spread to some warmer areas outside its native range. Yellow oleander is cultivated for ornamental purposes, taking advantage of its striking flowers and foliage. In regions where it is not indigenous, yellow oleander is sometimes thought to be an unwelcome resident, as it may have an impact on local ecosystems, though not aggressively. Its adaptability to different environments contributes to its widespread presence in cultivation and occasional environmental concerns.
Native
Cultivated
Invasive
Potentially invasive
Exotic
No species reported
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