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Many gardeners will tell you that aphids are the bane of their existence. According to a new study from the University of Florida, these tiny pests also pose problems for the iconic monarch butterfly.

Elizabeth Blackstone of West End Nursery, left, chats with customer Ann Brenner of Ross while Brenner selects a pair of native milkweed plants at West End Nursery in San Rafael on Tuesday, Aug. 30, ...

If you are planting milkweed to attract monarch butterflies, you are already ahead of the game. But even the most well-meaning gardeners can make critical mistakes when planting milkweed that may send ...

Though some believe tropical milkweed is responsible for declining population levels of monarch butterflies, researchers at UC Davis show that the plant neither helps nor harms the charismatic species ...

Some monarch butterfly researchers are questioning Marin County and other counties’ recent decision to ban tropical milkweed sales as a way to protect the state’s dwindling populations of the iconic ...

When artist Shawn Hall took a close look at the flowering plants in Crescent Park, she noticed something that made her curious. “I was looking at the milkweed and there was a monarch caterpillar on it ...

When oleander aphids infested tropical milkweed, monarch butterflies laid fewer eggs on the plant, and the caterpillars developing on those plants were slower to mature. Many gardeners will tell you ...