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Common Milkweed, Asclepias syriaca

SUN SOIL MOISTURE HEIGHT
Full
Partial
Medium Dry
Dry
5'
BLOOM USDA ZONES BLOOM COLOR
  • June
  • July
  • Zone 3
  • Zone 4
  • Zone 5
  • Zone 6
  • Zone 7
  • Zone 8
  • Zone 9

The much-maligned Common Milkweed is a real workhorse in Monarch butterfly recovery efforts.   Besides being a preferred hostplant for Monarch caterpillars this plant, once established, proves to be easy to grow but difficult to remove.  To many in agriculture, Common Milkweed is a weed that has no place in their fields.  This thinking has unfortunately played a role in the overall reduction in Monarch butterfly numbers.   By planting milkweed in your home landscape you’re helping to offset this food deficit.  “If you grow it, they will come” best describes the female Monarchs uncanny ability to find milkweed for her offspring.

Common Milkweed tends to be tall and spreads underground over time so think about giving it the room it wants.   Don’t worry though if you’re short of room!  We have other species like Butterfly Weed and Whorled Milkweed which are better behaved in the garden and which Monarchs readily lay their eggs upon.  If you do have the space though Common Milkweed is a good plant and can serve as a reserve food source.  As the summer progresses here in the nursery the caterpillars get bigger and the milkweeds would get smaller if we weren’t diligent in picking the caterpillars off the more “ornamental” milkweed species.  We transfer them to one of several clumps of Common Milkweed growing wild around the nursery and they readily take to their new food source.

In the landscape Common Milkweed has large, fleshy leaves and has an overall coarse appearance.  Pink flowers open for weeks and weeks and are attractive to many other species of native pollinators including flies, bees, bumblebees and beetles.  At night a whole new cast of insect characters visit the flowers looking for pollen and nectar.  Common Milkweed is, in fact, THE milkweed that most people think of when they hear the word “milkweed”.  Please note that we have dozens of species of milkweeds that look quite different than Common Milkweed but are just as yummy to Monarch caterpillars!   Take a moment to look at Butterfly Weed which has thin leaves and bright orange flowers and Whorled Milkweed which have very thin leaves and white flowers.  Whorled Milkweeds look like young pine trees as they are sizing up.  Each of these only get a couple of feet tall.