Most milkweed species evolved in open areas where they were exposed to full sunlight and they will do best if they are planted in the sunniest areas of your gardens. A few species, such as A. purpurascens, appear to require partial shade.

How many hours of sun does milkweed need?

Most milkweeds require full sun (at least 6 to 8 hours a day). Because they self-seed readily, locate your plants in a part of the garden where you can better control their rampant spread, such as at the back of the border or in a corner.

Where does milkweed grow best?

When & Where To Plant Milkweed

Common Milkweed grows well in average garden soil. Swamp Milkweed, as its name implies, will do best in a moist environment, making it great for wet meadows or rain gardens. Tropical Milkweed performs beautifully in hot, humid conditions, and can be grown as an annual in the north.

Why is milkweed illegal?

Milkweed does contain toxins that can be harmful to pets, livestock and people. The milky sap for which it gets its name leaks out from the stem or leaves. This sap contains toxins called cardiac glycosides or cardenolides, which are toxic to animals if consumed in large quantities.

Can I plant milkweed anywhere?

You can still grow them anywhere in the United States. However, if you live in a zone that falls between 1 and 9, the plants will die in the winter and you will have to replant from seed in the spring. In zones 10 - 11, these milkweed species will grow year round.

What You Should know BEFORE Planting MILKWEED

35 related questions found

Will milkweed come back every year?

It's always best to plant milkweeds that are native to your area. ... These native milkweed are perennials, meaning they come back year after year. Their aerial parts (flower, leaves, stem) die back but their rootstock remains alive throughout the winter.

Is milkweed an invasive plant?

A few tips for purchasing and planting milkweed

Common milkweed (Asclepias syriaca) is the source of the plant's bad reputation—it's quite invasive. ... These two alternatives do not spread by rhizomes and are employed by monarchs just as often as the common milkweed.”

What happens if you touch milkweed?

All parts of the plant contain toxic cardiac glycosides, which can cause nausea, diarrhea, weakness, and confusion in small amounts, and seizures, heart rhythm changes, respiratory paralysis, and even death in large amounts. Milkweed can also irritate the skin and eyes if touched.

Where should you not plant milkweed?

Do not grow milkweed if you live near the coast

Milkweed should be planted only where it once occurred naturally and, north of Santa Barbara, it has never grown close to the coast. To grow it there could distract monarchs on their annual migrations. We only recommend planting milkweed more than 5 miles inland.

Should I plant milkweed in my garden?

So the rule is: If you live along the California coast, plant nectar plants to support the monarchs migrating to and from overwintering sites; do not plant milkweed. It is best not to plant milkweed within 10 miles of an overwintering site.

How many milkweed plants should I plant?

For gardens, we recommend that you plant about 20-30 milkweed plants per 100 square feet. Milkweed plants should be spaced 1 foot apart, placed in clusters of 3-4 milkweeds.

Which milkweed is bad for monarchs?

This is the reason Tropical milkweed (Asclepias curassavica), an introduced species native to Mexico, is developing a bad reputation among monarch biologists and conservation organizations. It can delay the butterflies' instinctual fall migration through North Texas to the point of destruction.

Which milkweed is best for monarch butterflies?

Three species have particularly wide ranges and are good choices in most regions: common milkweed (Asclepias syriaca), swamp milkweed (A. incarnata), and butterflyweed (A. tuberosa).

Do bees like milkweed?

"Very fond of milkweed blossoms, bees will desert other flowers when these are available. The plants provide a good nectar flow. Bees discard the pollen. ... It is conceivably possible for bees and other small pollinators to become trapped in a blossom.

Do milkweed plants spread?

Common milkweed (Asclepias syriaca) is a perennial plant that can be found in a wide range of habitats including roadsides, fields, and gardens. It is native to North America and reproduces primarily from seed. Once it is established it can spread from its rhizomatous root system.

Why is my milkweed dying?

Funguses are often the result of too much rain or watering. ... It can also prevent another common fungus that causes milkweed to wilt and die.

Is milkweed poisonous to dogs?

The Pet Poison Helpline reports that milkweed is a moderate to severe poisoning in dogs and cats, which means get to the vet as soon as you suspect your pet has ingested the plant, or even butterflies or caterpillars that eat milkweed.

Will Monarchs eat any milkweed?

Monarchs cannot survive without milkweed; their caterpillars only eat milkweed plants (Asclepias spp.), and monarch butterflies need milkweed to lay their eggs. With shifting land management practices, we have lost much milkweed from the landscape.

How long does it take for milkweed to grow?

Wait - Place in a sunny window, in a greenhouse, or under a grow light. Cold-stratified Milkweed seeds should germinate and sprout within 10-15 days after planting.

Do rabbits eat milkweed?

Deer and rabbits have been reported to eat milkweed leaves, and there are many other insects that feed on milkweed such as milkweed bugs, tussock moths, queen butterfly larvae, and more. Nectar and pollen from milkweeds are important food sources for many pollinators, in addition to monarch butterflies.

Is milkweed good for butterflies?

Importance of Milkweed

Milkweed is the host plant for the monarch butterfly. Without milkweed, the larva would not be able to develop into a butterfly. Monarchs use a variety of milkweeds. Monarch larvae ,or caterpillars, feed exclusively on milkweed leaves.

How big do milkweed plants get?

This milkweed grows to about 1.5 meters(5 feet) tall, usually occurring in clusters of stout stems. It has rhizomes and quickly forms colonies. Leaves are 15-20 centimeters (6-8 inches) long and 5-9 centimeters (2-3.6 inches) wide. They are somewhat thick with a prominent midrib beneath.

Will milkweed grow in clay soil?

It does well in soils that are clay, sandy or rocky calcareous (high in calcium carbonate). These conditions occur naturally along stream banks, ponds, lakes, forest margins, and roadsides. Common Milkweed grows 2′ – 6′ tall and like areas with full sun.

How do you care for milkweed plants?

Milkweed plants grow well in dry or loamy soil as long as the area drains well. They don't require any fertilizer to thrive. With the exception of droughts in your area, you can skip watering, too. During droughts, keep the flowers blooming with weekly watering.

Where do monarch caterpillars go at night?

When getting ready for pupation, the full-grown caterpillars usually wander off the plant some distance to find a place to make their chrysalis. During the feeding and growth stage, they just remain under leaves at night.