Plant Milkweed for Monarchs

Milkweed plants are the only hosts for Monarch butterfly larvae, and natural habitats are being lost rapidly.

| Fall 2015

Monarch butterflies have a multi-generational migration that can span thousands of miles and three continents. In 1996, an estimated 1 billion monarch butterflies migrating to forests in central Mexico covered almost 50 acres. In those same forests in 2015, they only covered 2.79 acres, the second smallest number on record.

Mexico has preserved the few forest areas where the butterflies over-winter. A monarch migration map is available online at Monarch Migration to show their route to these forests.

Milkweed habitat loss is due to development — both rural and urban, excessive mowing and the widespread use of glyphosate, the main ingredient in Monsanto’s Roundup® herbicide on crops and roadsides. Herbicide use in the U.S. for soy and corn killed off 58% of the country’s milkweed from 1999 to 2010, resulting in a monarch decline of 81%. This suggests that the monarchs are becoming extinct.

The problem isn’t only the lack of milkweed. Iowa State University found evidence that pollen from bioengineered corn could be deadly for Monarch butterflies. Monarch butterfly caterpillars were seven times more likely to die when they ate milkweed plants carrying pollen that drifted over from Bt corn, compared to traditional corn. Fifty percent of the monarchs that make it to Mexico typically come from the Corn Belt.

Milkweeds all carry the name of the Greek god of healing and medicine, ‘Asclepias’. The medicinal qualities of their roots were well known to indigenous peoples. However with our valuable pollinators relying so heavily on this plant, using other plants for medicine may be the prudent choice.

There are over 100 species of milkweed. One of the most popular is the beautiful orange butterfly milkweed which grows on my farm along with the stunning purple milkweed. When I first started my medicinal wildflower farm, there were very few milkweed stands. Though some people save the seed, cold stratify, start the plants indoors, and plant out after the fear of frost, I like to plant my seeds in November so that they will cold stratify outdoors. A few months prior to planting the seeds, cover a fresh patch of earth to kill any grass and allow a few frosts to heave up and disturb the soil. Then remove the cover exposing the soil and after a nice rain, press the seed into the earth. This has allowed me to create several hardy, drought-tolerant stands of perennial milkweeds. This method will not work for the warm weather annual milkweeds.

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