Chances are there are more finicky flowers in your garden than the Butterfly Weed, so feel free to allow them to dictate the soil composition—when it comes to this plant, you don’t have to stress. Butterfly Weed can prosper in a variety of soil conditions and compositions, from clay to gravel, and generally prefers a neutral to slightly acidic pH.
Because the Butterfly Weed is adaptable to zones three through nine, it can thrive in a variety of different temperature and humidity settings. Generally, the plant emerges in late spring, hitting its peak bloom during the warmer summer months and drying on the stem throughout the autumn and winter. It also tolerates heat and drought well.
Beloved for its ability to attract a variety of helpful (and beautiful) insects to the garden, Butterly Weed is an easy-to-nurture varietal that can also be found growing as a native wildflower in a slew of untamed environments, like meadows, prairies, and forests. Typically grown from seeds you sow directly in the garden in the fall, the butterfly plant does not require much tending to in order to thrive, prospering well in everything from clay soil, to dry or rocky soil, and even throughout drought-like conditions. Its seed pods will brown towards the end of its growing season (early autumn) and, if left on the plant, will burst and spread seeds throughout your garden to emerge as new growth the following spring. While the plant can take up to three years to fully mature and produce flowers, its blooms will gradually grow denser with each season that passes.
During its first year of life (or until new plants start showing mature growth), you should maintain a moist soil environment for the Butterfly Weed. Once the plant appears to be well-established, you can cut back to watering it only occasionally, as it now prefers dry soil.
The low maintenance Butterfly Weed does not require any additional fertilization—in fact, doing so can harm the plant, so it’s best to just let it do its thing.
Arrange the starter pots on a propagation mat near a source of bright, indirect light such as near a partly shaded south-facing window. Set the temperature on the propagation mat to 86 F during the day. Turn it off at night.
Before you begin to harvest the butterfly weed pods, sterilize your cutting tools. Dip the blades into a full-strength household cleanser, such as Lysol or Pine-Sol. Repeat between cuts to prevent the spread of diseases.
Leave the bucket outdoors for two or three days to let the fluff blow away. Stir the seeds occasionally to loosen more fluff. Do not worry if some of the fluff remains, since it won’t inhibit the germination process.
Watch for germination in two to three weeks. Turn off the propagation mat one week after the seeds sprout. Move the pots into a cold frame outdoors or against a south-facing wall with noonday shade.
Make a 1/4-inch-deep planting hole in the center of compost mixture. Drop one butterfly weed seed in the planting hole. Cover it with a loose layer of compost. Mist the compost to settle it.
Sometimes called pleurisy root, butterfly weed (Asclepias tuberosa) is a perennial wildflower grown for its showy, reddish-orange flower clusters and textured, lanceolate leaves. A member of the milkweed family, it thrives throughout U.S. Department of Agriculture plant hardiness zones 3 to 9, where it is frequently added to butterfly gardens and native plant landscaping.
Butterfly weed and milkweed seed pods may be harvested and planted to support Monarch butterfly caterpillars. Butterfly weed grows well from seeds, which must be harvested in late summer and either sown immediately in the garden, or started in spring after a lengthy chilling process. The seeds are viable and will germinate with little care, although they must be planted at the appropriate depth to ensure successful sprouting.