The monarch butterfly heads northeast from Mexico on its annual migration in late February arriving in Canada in late June or early July. These spring migrating butterflies only live two to six weeks so the migration means stopping along the way to lay eggs on milkweed plants to keep the generations going. The monarchs who finally arrive in Canada in the summer are the great-great-grandchildren of the ones that left Mexico in February.
It takes four days for eggs to hatch into caterpillars. For the next two weeks caterpillars will munch on milkweed until they mature and wrap themselves in a silk chrysalis. Ten days later they emerge from this cocoon as a fully formed monarch butterfly.
Isn’t that amazing? From a speck of an egg to a caterpillar to a butterfly in a month!
I talked to one gardener in Ontario who actually saw an egg hatch. Imagine seeing a baby monarch drying its newborn wings in the sunshine! An experience of a lifetime and it can be yours for the price of a plant.
For their migration to be successful they need to have milkweed plants to lay their eggs on. When the larvae hatches it is the milkweed plant-and only the milkweed-that provides the food the caterpillars must have. Without milkweed monarchs would have nowhere to land, recover and reproduce. They would go extinct. As gardeners we can help by planting milkweed in our yards.
Just when you thought it couldn’t get more interesting it does. Towards the end of the summer the monarchs hatch out a “super generation” that will live for seven or eight months instead of a few weeks. These super monarchs (though all butterflies are pretty super) make the entire journey to Mexico and live long enough to begin the return journey north in February.
How do they know where to go? And when they return in the spring, how do they know where the milkweed patches are that their great-great-grandparents landed on all those months ago?
These are wonderful questions to meditate on while planting patches of milkweed in our gardens.
Milkweeds Asclepias tuberosa are a perennial native to NorthAmerica and hardy to garden zones 3 -9. Clusters of fragrant flowers come in a variety of colours including pink, white and original orange. The plant grows to heights of 60-90 centimeters (2-3 feet).
Veseys in PEI, Canada offers tubers for sale along with the following advice
Plant 15″-18″ apart with the top of the tap root about 1/2″ to 1″ below soil level and digging deep enough to plant the carrot-like root vertically without coiling or breaking the roots. Mix a couple teaspoons of bone meal into the planting hole if desired. Grows best in full sun, in sandy, well drained, soil.
May be difficult to move without damaging the root system if they have been planted for a long time. If necessary transplant only when dormant or propagate by seed.
Blooms July – August. On a large plant, you could easily find several butterflies at any one time. Once established, these members of the milkweed family are extremely drought tolerant and very long lived.
Orange Shades Butterfly Flower This one is available by seed instead of tubers.
Want to know more? Here are a couple books that are worth checking out…