However, Butterfly Weed prefers full sun. The more sun it receives, the larger it will grow. And the more blooms and vigor it will have.
Squishing Oleander Aphids is the most effective in my experience. It’s gross, but they are never coming back!
To grow Butterfly Weed seed in pots, you need to do the following steps:
Butterfly Weed Water Requirements
The long taproot of Butterfly Weed means that it will rarely need watering. You can plant this in the sunniest, driest spot in your yard and it will thrive!
 – Fishbein, M. and Venable, D.L. (1996), Diversity and Temporal Change in the Effective Pollinators of Asclepias Tuberosa. Ecology, 77: 1061-1073. https://doi.org/10.2307/2265576
The primary non-native pest for Butterfly Weed is the dreaded Oleander Aphid. These aphids are thought to have come from the Mediterranean, where the Oleander plant grows wild .
3 – Plant Butterfly Weed seeds just under the soil, barely covered. Or just press them into it and cover with a light dusting.
Snip off the pod using pruning shears. Slice lengthwise along the edge using a utility knife. Pry open the seed pods. Scoop out the seeds and fluffy matter inside and place it in a bucket.
Gather the butterfly weed seeds in late summer or autumn, once the pods dry to a light, rosy-beige color, but before they split open. Put on rubber gloves before handling the pods to protect your hands from the mildly toxic sap.
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.
Prepare peat or other biodegradable pots before removing the butterfly weed seeds from the refrigerator. Fill 3-inch starter pots with a mixture of half seed-starting compost and half coarse sand. Moisten the mix and press it firm.
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.
Choose a spot in your garden to plant your Butterfly Weed that boasts hours of bright sunlight daily, as this plant loves to soak up the rays. Full-sun is definitely your best bet, but the hardy plant can tolerate a few hours of shade too.
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.
Typically, the easiest and most successful way to add Butterfly Weed to your garden is to grow it from seed form. Plant fresh seeds in fall for growth the following spring, or allow any established Butterfly Weeds already in your garden to do the work for you. Beginning in late summer or early fall, the plants should start to develop seed pods in place of their blooms. If left on the stem, the pods will eventually burst and the seeds inside will be blown throughout your garden, allowing them to establish themselves in the soil in time for the following year. If you’d rather have more control over the eventual location of any new Butterfly Weed plants, you can remove the seed pods from the plant before they burst open and simply plant new seeds by hand instead.
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.
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.