Butterfly weed is toxic to both humans and pets. Monarch’s Favorite Milkweed. Butterfly Weed Butterfly weed (Asclepias tuberosa) Butterfly weed falls at the bottom of the list because most Monarchs prefer other milkweed plants. Is butterfly weed poisonous to humans, dogs, or cats? How to Cut Back Butterfly Milkweed. The monarch’s top 4 favorite milkweed species are bolded in the list below.. Asclepias tuberosa Perennial Forb Dogbane Family. Butterfly weed, a type of milkweed, is a favorite nectar plant for butterflies, and the leaves are eaten by the caterpillars of monarchs. Butterfly weed is native to the prairies of the Midwestern United States. Plants grow 2 to 3 feet tall and produce flat-topped clusters of bright orange flowers from July through September. However, when given a choice, their favorite milkweed by far, is the Asclepias incarnata, common name: Swamp milkweed. However, the Monarch butterflies have used it in my yard when it has been the first one up or when all other milkweed has been depleted. This means it takes much longer for the caterpillar to grow. The butterfly weed (Asclepias tuberosa) is a member of the milkweed family. Butterfly bush is a large shrub that is a great nectar plant whereas Butterfly Weed is a short milkweed that can be used as a host plant by Monarchs as well as being a nectar plant. Butterfly Weed with Tropical Milkweed Since many milkweed species serve as host plant for caterpillars and nectar source for butterflies, milkweeds also make good companion plants for each other. Butterfly weed (Asclepias tuberosa) produces green foliage through spring and summer and clusters of small red, orange or … Milkweeds in the genusAsclepias are one of the joys of summer.One of the most beautiful and easily recognizable species is the orange milkweed or butterfly-weed (Asclepias tuberosa).There are 10 other species of milkweed in our area through the northern Blue Ridge Mountains (summarized in the chart, below, with the taxonomic changes in milkweeds.) Their flowers attract several butterfly species, hence the common name. Monarchs favor a variety of milkweeds, and in fact, with variety they’ll lay more eggs. The winner is the Asclepias incarnata, common name: Swamp milkweed What is a butterfly weed? In the garden, butterfly weed looks great in Growing butterfly weed requires very little effort. It is a big magnet for other butterflies as a nectar source. Butterfly weed plants (Asclepias tuberosa) are trouble-free North American natives that produce umbels of bright orange, yellow or red blooms all summer long.Butterfly weed is appropriately named, as the nectar- and pollen-rich flowers attract hummingbirds and hordes of butterflies, bees and other beneficial insects throughout the blooming season. Height: Up to 3 feet Blooms: orange, June to September Sun: Part sun to full sun Soil: Well-drained, poor, dry, usually rocky or sandy soil Garden Use & Maintenance: A stunningly showy wildflower with a long bloom period. Maryland Distribution: Poor, coarse soils of dry fields, rock outcrops, and other steep slopes throughout the state. Unlike common milkweed (Asclepias syriaca), butterfly weed (Asclepias tuberosa) does not have the quickly spreading roots that qualify it as invasive. 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