Milkweed seeds

From the 'mother plant' (they are expensive, I bought it years ago for $20),  I save the seeds and plant them. Every day the monarch butterfly mama is cruising around this plant where it lays eggs. The caterpillars munch on the leaves and then they disappear and are very hard to find, when they are becoming a chrysalis.
I only saw it happen once and took lots of photos and posted it years ago.