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Weed Identification

tall morning-glory

Family

Convolvulaceae

Scientific Name

Ipomoea purpurea

Synonyms (former Scientific Names):

Ipomoea hirsutula
Convolvulus purpureus
Pharbitis purpurea

Habit

This climbing annual, flowers from July through September. Even though the plant will die at the first frost, its vines and fruit will persist through the winter. The seeds germinate in early summer.

Leaves

The heart-shaped leaves are arranged alternately on long petioles. Leaves have hairs that lie against the leaf surface. The hairy climbing stems can grow up to 6.5 feet in length. Leaves are typically 4 inches (100mm) long and 3.5 inches (88mm) wide.

Identifying Characteristics

This plant can be identified by the way that its heart-shaped leaves generally overlap one another. Another key feature is its multi-hued purple/white flowers. The cotyledons are often more square than ivy/entireleaf morning-glory.

Flower Seed Head

The white to light blue or purple flowers grow from 1.5 to 3 (38-75mm) inches in length and around 1.5-2.5 inch (40-60 mm). The stalks are generally shorter than the leaf petioles, with 1-3 flowers occurring at the leaf axils.

Seed Fruit

4 to 6 wedge-shaped, hairy, blackish seeds form in brown capsules.

Where Found

This plant prefers moist rich soil, but will adapt to most conditions. It can be found in agricultural settings, as well as landscaping, where people often plant them as decorative vines.

Growth Habit

vine

Thorns or Spines

not present

Approximate Flower Diameter

Varies: 
half dollar
larger

Dominant Flower Color

Varies: 
white
blue
purple

Flower Symmetry

radial symmetery

Leaf Hairs

has hairs

Leaf Arrangement

alternate

Leaf Margin

entire

Leaf Structure

simple

Leaf Stalk

Varies: 
shorter than leaf
longer than leaf

Stem Hairs

has hairs

Stem Cross Section

round or oval

Milky Sap

not present

Root Structure

taproot

Life Cycle

summer annual

Ochrea

not present

Plant Type

Vine