Every summer we have Monarchs laying eggs on the milkweed and butterfly weed. I've planted tons of it so they have lots of food. I also had hubby help me build some hatchery boxes. Monarch eggs have a tough time. They have many predators from wasps to mice. So taking the eggs to a protected place gives them an almost certain chance to make it to the butterfly stage. On their own it's only 1 or 2 in 10 eggs that make it!
These are pics from 2 years ago when I released over 200 Monarchs! :D