News in Brief Climate

Bloodflowers’ risk to monarchs could multiply as climate changes

Heat and CO2 scenarios suggest a milkweed species becomes toxic or useless to caterpillars

monarch butterfly on tropical milkweed

MONARCH BEWARE  As the climate changes, lovely tropical milkweed popular in gardens may become even more of a danger to monarch butterflies than it is now.

Warren Price Photography/Shutterstock

By Susan Milius

- More than 2 years ago

Climate change could make a showy invasive milkweed called a bloodflower even more of a menace for monarch butterflies than it already is.