It is Tall White Aster, Symphyotrichum lanceolatum , and the good news is, it is actually what the Monarchs need more at certain times of the year than Asclepias. How do Chemicals in Milkweed Benefit Monarchs? The bad taste and toxicity of both the larvae and adults are advertised by conspicuous, warning coloration. Hello everyone, This week another bombshell study was published in the monarch world, this time about the effects of tropical milkweed (yes, that again). While awareness is rising around the⦠Because tropical milkweed can live year-round in warm climates, monarchs may miss important environmental cues which normally trigger winter ⦠What is the Xerces Societyâs position on this milkweed species? Monarch butterflies lay their eggs on just one type of plant, and thatâs milkweed (genus Asclepias). The milkweed being discussed was the tropical variety most widely available in the usual stores, Asclepias curassavica, known commonly as Scarlet or Tropical milkweed. Today's post is devoted to this new study. In Southern California, gardeners have milkweed choices when outdoor plant shopping.For decades the most common milkweed species in our gardens has been a Central American species sometimes called Tropical Milkweed, or more correctly Asclepias currassivica.It is a magnet for monarchs and even a single plant in a garden will soon display a few colorful caterpillars dining on its leaves. When a bird or other predator tastes a monarch, it learns to associate this color pattern with the bad taste, and avoids preying on monarchs in the future. Is tropical milkweed (Asclepias curassavica) bad for monarchs? A: What you have here is not a milkweed. Since milkweed species have varying needs for sun, water and space, pay extra attention to growing requirements. Itâs helpful to have a diverse selection of native milkweed and flowering plants, but avoid tropical milkweed (A. curassavica). Tropical milkweed is not native to the U.S. but is sold by many plant nurseries and is frequently planted in gardens. https://www.nwf.org/Garden-For-Wildlife/About/Native-Plants/Milkweed.aspx And like all previous studies on this plant, this one is sure to generate some interest, controversy, flak, and rankling. Although itâs easy to grow, tropical types host a parasite that infects and harms monarchs. T Click to see full answer Also question is, which milkweed is bad for monarchs? Instead, the parasite infected migratory monarchs may have dropped out of the long journey for health reasons and instead of dying off, found a nice, cushy place to rest in the tropical milkweed. Monarch caterpillars that fed on Asclepias curassavica, or tropical milkweed, lost 77 percent of their tolerance to protozoan parasites. I would like to have milkweed plants for Monarch butterflies. 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