Incarnata is known to survive dry soil, but still prefers evenly moist conditions. If you are planning to plant Asclepias from seed it is best to scatter the seeds in the fall, as the seeds need to be weathered. For best results, as with other butterfly gardens, please allow plants the opportunity to progress through two years of growth. In fact, when it comes to medicinal properties, in my recent journal on Asclepias, I gave historical evidence that the genus was previously known to treat many ailments, including cancer, heart disease and pneumonia. Just recently, the Asclepias genus was found to contain chemical compounds that double the number of cancer fighting agents.
Sunshine is of foremost consideration to butterflies.
If possible, make sure your butterfly garden has southern exposure. Butterflies use early morning sun for basking on warm rocks, bricks or paths. As the morning temperatures rise, butterflies commence visiting their favorite nectar sources, but always in sunlit areas, as they try to avoid shade. Butterflies cherish an area where they can fly without being beat in the air. That is why, it is recommended to choose a garden spot that is protected from prevailing winds.