Monarch butterflies (Danaus plexippus) have been visiting the milkweed plant in my flower garden this month. When I bought the milkweed plant in late spring, I did not realize there were actually two varieties of milkweed in the two gallon pot. One has reddish stems with red and yellow flowers, and the other has green stems and orange flowers.
The monarch caterpillars seem to prefer the red stemmed variety, as I have observed them for several days now and they are always feeding on that variety. However, the female monarch butterfly was spotted laying her eggs on the both varieties. Here she deposits an egg on the underside of the leaf.