How Tall Does Milkweed Grow?

Milkweed is a common wildflower that grows in fields and along roadsides across North America. It gets its name from the milky white sap that oozes from its stems when they are broken. This sap contains a toxic substance called cardenolide, which makes milkweed unpalatable to most animals.

However, the Monarch butterfly larvae have developed a resistance to this toxin and actually feed on milkweed leaves.

Many people are surprised to learn that milkweed (Asclepias sp.), the plant that is the sole food source of monarch butterflies, can grow quite tall. In fact, some species, like A. exaltata, can reach heights of over six feet! However, most milkweed species average between two and four feet in height.

Why such a wide range in size? It turns out that several factors influence how tall milkweed will grow. One important factor is the amount of sunlight the plant receives.

Milkweed needs full sun to thrive, so plants growing in shady areas will be shorter than those in sunny spots. Soil type is another important factor – milkweed grows best in rich, well-drained soil. Plants growing in heavy clay or sandy soil will be smaller than those in ideal conditions.

Finally, the age of the plant also affects its height. Younger plants are usually shorter than older ones, although there can be considerable variation even among plants of the same age. For example, a one-year-old A. syriaca plant might only be a few inches tall while a mature specimen could reach four feet or more.

So how can you tell how tall your milkweed will grow? The best way is simply to wait and see! Start by planting your seedlings or transplants in an area with full sun and good soil drainage.

Water them regularly and fertilize them if needed (milkweed is not a heavy feeder but benefits from occasional supplemental nutrition). Then just sit back and watch as your beautiful milkweeds slowly but surely reach their full potential stature!

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Growing Milkweed for Monarch Butterflies

-How Tall Does Milkweed Grow

In the wild, milkweed can grow to be six feet tall. However, when cultivated, it is usually kept much shorter through pruning.

How Tall Does Milkweed Grow?



Milkweed is a type of herbaceous flowering plant that can range in height from 30 cm to 3 meters. The most common milkweed species in North America, Asclepias syriaca, typically grows to a height of 1-2 meters.