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Butterfly Farming Larval Host Plants Milkweeds (Asclepias)

What is “Asclepias”?

“Asclepias” is a genus of perennial plants commonly known as Milkweeds. The genus belongs to the family Apocynaceae and consists of around 140 known species, most of which are native to North America. The milky latex is toxic to most mammals, including humans, but this protects Milkweed Butterfly larva from predators.

Western honeybees pollinate an orange Asclepias species. Surprisingly, Monarch Butterflies can’t actually pollinate Asclepias.

The name “Asclepias” is derived from the Greek god of healing, Asclepius, as these plants were traditionally used in herbal medicine.

Greek God of healing, Asclepius.

Milkweeds are herbaceous plants that typically have simple leaves arranged in pairs or whorls along the stem. The flowers of milkweed plants are unique and attract pollinators such as bees and butterflies. They have five united petals that form a distinctive crown-like structure known as a corona.

Milkweed flowers are often fragrant and come in various colors, including shades of pink, purple, orange, and white.

Swamp Milkweed (Asclepias incarnata) has pink flowers.

One notable characteristic of milkweeds is their milky sap, which contains toxic compounds called cardiac glycosides.

These compounds make milkweeds unpalatable and potentially harmful to most animals. It is also toxic to people. However, certain insects, particularly monarch butterflies and their caterpillars, have evolved to tolerate and even sequester these toxins, which provide them with a defense mechanism against predators.

Monarch Caterpillar with Asclepias Incarnata, Swamp Milkweed whose milky, toxic sap protects the larvae.

Milkweeds are ecologically significant plants as they serve as important host plants for Monarch Butterfly larvae. The caterpillars feed exclusively on milkweed leaves, which contain the necessary nutrients for their development. Moreover, milkweed flowers are a valuable nectar source for many pollinators, contributing to the overall biodiversity of an ecosystem.

In addition to their ecological role, milkweeds have also been used for various purposes by humans. Some species have a long history of medicinal use in traditional herbal remedies. Furthermore, the fibers from milkweed plants have been utilized for making textiles and cordage, and the seed pods of certain species have been employed in crafting.

Milkweed Seed pods. Seeds are disbursed by the wind.

Overall, Asclepias, or milkweeds, are a diverse group of plants that possess ecological importance, unique floral structures, and historical significance in human uses. And since Monarch Butterflies require Asclepias plants to feed their babies, we need Milkweed more than ever. With your help planting Milkweed, we can restore all Milkweed Butterfliesone day at a time!

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