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Today is August 13, 2022

Southern Gardening

Plant butterfly weed species to provide monarch habitat

By Dr. Gary Bachman

Plant butterfly weed species to provide monarch habitat

Most gardens and landscapes are planned for either beauty or utility. We want pretty places to live in and look at, and we like to eat fresh fruit and produce that we have grown.

But there are other reasons to prepare a garden or landscape. One of the most fun and rewarding reasons is to make room for butterflies and other pollinators. Today, I want to talk about how to make your landscape welcoming to monarch butterflies.

The monarch butterfly could be called America’s Butterfly. Although it is found outside this continent, the North American monarch is one of the most recognizable and loved of all insects. The annual migration of the North American monarch is one of the most unusual, as it is the only insect known to make a two-way migration, like that of migrating birds.

You probably easily recognize the brilliant coloring of the large monarch butterflies. They have two sets of deep-orange wings with black borders and veins, and white spots along the edges. As a caterpillar, it striped in yellow, black, and white bands and reach up to 2 inches long before it becomes a light-green chrysalis with tiny, yellow spots.

As gardeners, we can help them the most at their caterpillar stage when they have voracious appetites.

Butterfly weed, known scientifically as the Asclepias species, and related plants provide the primary forage for monarch caterpillars. In garden centers, you are most likely to find Asclepias tuberosa, a Mississippi native, and Asclepias curassavica, a non-native tropical plant.

Tropical milkweed, which is the common name for Asclepias curassavica, has the potential to cause problems because the plant doesn’t die back to the ground in the winter.

A protozoan parasite of monarch butterflies known commonly as “OE” can live on the milkweed leaves and be transmitted to caterpillars. In adult monarchs, high levels of OE have been linked to a variety of negative factors, including lower migration success, reduced body mass, and a shortened lifespan.

If you decide to grow tropical milkweed in your garden, you are advised to cut the tropical milkweeds plants back to the ground to help prevent the spread of this parasite.

The good news is that native milkweeds die back after blooming, killing any parasites living on them. Mississippi has up to 14 different milkweed species that are native. That gives us the ability to make a lot of habitat available to monarch butterflies.

The Mississippi State University Crosby Arboretum in Picayune has been leading the way in promoting these lesser-known native species. In fact, that’s where I learned about seven new-to-me milkweed species I’m growing this summer. 

 

Visit crosbyarboretum.msstate.edu/mississippi-milkweeds for more about these native milkweeds.

 

 

Gary Bachman, Ph.D., Extension/Research Professor of Horticulture at the Mississippi State University Coastal Research and Extension Center in Biloxi. He is also host of “Southern Gardening” radio and TV programs. He lives in Ocean Springs and is a Singing River Electric member.

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