Botanical name: Funastrum heterophyllum

Common mane: Hartweg's Climbing Milkweed

one size - 10 seed packet

Funastrum heterophyllum, commonly known as Hartweg’s climbing milkweed or Hartweg’s twinevine, is a perennial climbing member of the milkweed family native to the southwestern United States and northern Mexico. It is especially characteristic of desert washes, arroyos, rocky slopes, sandy soils, and other dry habitats across the Sonoran and Chihuahuan Desert regions.

This species produces slender, twining stems with narrow leaves and clusters of unusual cream, pink, and purple flowers. Its vining habit allows it to climb through nearby shrubs or supports, creating a distinctive vertical element in native and xeric plantings.

Hartweg’s climbing milkweed is best suited to full sun, heat, and well-drained rocky or sandy soil. Once established, it is well adapted to dry southwestern conditions and is a strong choice for desert gardens, wildlife plantings, and naturalized landscapes.

The flowers provide nectar for insects, while the plant’s milkweed-family characteristics make it a valuable addition to habitat-focused gardens.

A distinctive native climbing milkweed for dry, sunny Southwestern landscapes..