- Species and varieties: Asclepias syriaca, commonly known as common milkweed, is a species of flowering plant in the Apocynaceae family. It is native to North America and is known for its role in supporting monarch butterfly populations. There are no significant varieties of Asclepias syriaca, but it is often confused with other milkweed species such as Asclepias tuberosa (butterfly weed) and Asclepias incarnata (swamp milkweed).
- Hybrid or heirloom: Asclepias syriaca is typically considered an heirloom plant, as it is a native species that has been growing in North America for centuries. It is not commonly hybridized.
- Pruning and training: Pruning is not typically necessary for Asclepias syriaca, but deadheading spent flowers can encourage additional blooms and prevent unwanted self-seeding. If the plant becomes too tall or leggy, it can be cut back to promote bushier growth. Be cautious when handling the plant, as its sap can be irritating to the skin.
- Fertilization needs: Asclepias syriaca generally does not require fertilization, as it can thrive in poor soils. However, if the soil is particularly deficient, a balanced, slow-release fertilizer can be applied in the spring. Over-fertilization should be avoided, as it can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Asclepias syriaca is suitable for USDA hardiness zones 3 through 9. It is a hardy plant that can tolerate a wide range of temperatures and conditions.
- Climate requirements: Common milkweed thrives in full sun and well-drained soil. It is drought-tolerant once established and can grow in a variety of soil types, including sandy, loamy, and clay soils. It prefers a pH range of 4.8 to 6.8. This plant is well-suited to temperate climates and can withstand cold winters and hot summers.