# Milkweed cultivars, and whether monarchs mind

> A garden center sells you ‘Ice Ballet’, not Asclepias incarnata, and the question that follows is always whether it still counts. For milkweed the answer is usually yes, and the things actually worth checking are different ones.

Source: https://milkweedusa.com/guides/milkweed-cultivars/  
License: CC BY 4.0 (Milkweed USA)

A cultivar is a plant somebody selected and then propagated, usually for flower color, height or habit. When the parent is a native species the result gets called a nativar, and there is a long-running argument about whether nativars are as good for wildlife as the plants they came from.

For milkweed specifically, the argument is quieter than it is for most genera, and it is worth understanding why.

## The short answer

PHOTO:common-milkweed-hero:1

**Monarchs lay on the common milkweed cultivars.** The selections in the trade are for petal color, plant height and flower size. None of them alters the leaf chemistry that a monarch caterpillar is adapted to, and none removes the cardenolides that make the whole system work. A female looking for somewhere to lay finds ‘Ice Ballet’ as readily as she finds the pink form growing next to it.

That is not a general license for nativars. In other genera the evidence is genuinely mixed: work by Annie White and others has found that some native cultivars receive markedly fewer pollinator visits than the straight species, particularly where breeding changed flower shape or color enough to interfere with access. Most of that research is about **nectar visitation by pollinators**, not about **larval host use**, and milkweed selections have not changed the flower architecture in the way that, say, a doubled coneflower has.

## What to check instead

Two things matter far more than whether the label carries a cultivar name.

**Is it the right species for where you live?** A garden center in Denver will happily sell you swamp milkweed, and swamp milkweed will happily sulk in dry Front Range soil. [Check what is native to your state](/states/) before anything else. This is the question that decides whether the plant lives.

**Has it been sprayed?** Neonicotinoid insecticides are systemic: they move through the plant, persist for months, and are lethal to caterpillars feeding on treated foliage. A plant grown for the mass market may well have been treated, and the label will not say. Ask, and if nobody can tell you, buy somewhere that can. [Where to buy milkweed](/where-to-buy/) lists nurseries that know their own stock.

Those two questions decide almost everything. The cultivar name decides very little.

## Where cultivars genuinely are the wrong choice

**Restoration and prairie seeding.** A cultivar is a clone or a narrow selection, and planting acres of it puts a very small amount of genetic diversity into a landscape that will have to cope with a changing climate. For anything larger than a garden, ask for straight species of local provenance, ideally seed collected within a few hundred miles. [Some suppliers sell exactly this](/where-to-buy/), and it is worth the extra effort.

**Anything with variegated foliage.** Variegation means less chlorophyll, which means a smaller, slower plant with less leaf on it. A caterpillar needs leaf area above all else. A variegated milkweed is a worse host than a plain one, straightforwardly.

**Tropical milkweed, whatever the cultivar is called.** ‘Silky Gold’ and ‘Monarch Promise’ are attractive plants and they carry every problem the species has. [The tropical milkweed guide sets out why](/guides/tropical-milkweed/), and none of it is fixed by a prettier flower.

## The cultivars you will actually meet

CULTIVAR_TABLE

## Where to look for evidence

Mt. Cuba Center in Delaware runs multi-year trials of native perennials and their cultivars side by side, scoring garden performance and, in recent trials, pollinator visitation. They have trialed *Asclepias*, and their reports are free, specific and unusually honest about what did badly. If you want to know whether a particular selection is worth the money, that is the place to look rather than the plant tag.

## So: cultivar or straight species?

In a garden, plant whichever you can get, of the right species, that has not been sprayed. A cultivar in the ground beats a straight species you never found.

On land you are restoring, use straight species of local origin, and take the trouble to source it properly.

And in either case, plant more than one. [Ten stems in a group](/guides/monarch-waystation/) is the number a female monarch reliably finds; one plant of anything is decoration.

## Questions

**Are milkweed cultivars bad for monarchs?**

No. Monarchs lay eggs on the common milkweed cultivars as readily as on the straight species, because the selections are for flower color and height and do not alter the leaf chemistry. The exceptions are variegated selections, which carry less leaf, and any cultivar of tropical milkweed, which inherits that species’ problems.

**Is Ice Ballet milkweed good for monarchs?**

Yes. It is a white-flowered selection of swamp milkweed, Asclepias incarnata, with the same habit, the same season and the same value as a host plant. It is one of the most widely available and most reliable garden milkweeds.

**What is a nativar?**

A cultivar of a native species: a plant somebody selected out of a wild population, or bred from one, and then propagated. The word carries an argument about whether such plants serve wildlife as well as the originals. For milkweed the evidence says they largely do; for some other genera it is less settled.

**Should I use cultivars for a prairie planting?**

No. Use straight species of local provenance. A cultivar is a clone or a narrow selection, and seeding acres of one puts very little genetic diversity into a landscape that will need it. Cultivars are a garden choice, not a restoration one.

**Is Silky Gold milkweed safe to plant?**

It is a cultivar of tropical milkweed, so it carries the same problems: in a frost-free area it does not die back, which lets monarchs stop migrating and lets OE parasite loads build. Plant a species native to your state instead.

## How to cite

Milkweed USA. (2026). Milkweed cultivars, and whether monarchs mind. https://milkweedusa.com/guides/milkweed-cultivars/