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The Deep Middle


Gardening & writing in the prairie echo

Native Plant Cultivars 101

1/26/2019

13 Comments

 
Should you be using native plant cultivars? Are they as robust or as beneficial to wildlife as straight species natives? Oh my, what are straight species? As you plan your garden for climate resilience, wildlife benefit (pollinators and birds especially), and low maintenance design, here is some information to keep in mind.

What is a Straight Species Native Plant?
A plant that is found in the wild and has not been grown to produce specific ornamental traits. It's evolved naturally in the wild and reproduces via open pollinated seed (wind blown or insect produced pollination without the help of humans). That's the super simple definition, which is what we're going for throughout this piece.

What Is a Cultivar?
A native plant cultivar (or nativar) is a plant that differs from the straight species in some regard -- usually height, bloom color, bloom size, or leaf color. There are two main types of cultivars:

Selection -- A plant sport, showing any of the aforementioned differences, that's found in the wild or a garden then is humanly reproduced to maintain that different trait. So a plant hunter might find an aromatic aster in a prairie with a different bloom color or overall size than the more prominent straight species. The plant tag will read something like Asclepias tuberosa 'Holy Flower Batman.' Something like that. :)

Hybrid -- Purposely crossing two related plants, via human pollination, to produce a desired trait in a new plant. So think about orange coneflowers or pompom coneflowers. The plant tag will read something like Echinacea x 'Shiver Me Timbers.'

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How Are Cultivars Problematic?
Overall, the first issue is one that's not just about native plants, but growing and selling all plants (native or not) in general.

Tissue Culture -- This is the process of reproducing plants for the mass market on a large scale; basically it's cloning. You take a physical piece of a live plant you wish to reproduce and get it to root and grow into a full-sized specimen. The problem here is that even if it's a native plant -- straight species, selection, or hybrid -- you're producing the same exact plant over and over thousands if not millions of times. One issue could be this: that if you reproduce a genetically identical plant native to the south, and then place it in the north, it may have a harder time thriving in the climate and / or have its bloom time out of sync with local pollinators. While many native plants have large ranges across the U.S., those ranges include many distinct genetic populations adapted with and evolved to the local climate and wildlife. Even a big bluestem in eastern Nebraska is different than one in western Iowa.

Pollinator Support -- When we alter bloom colors or shapes we're altering far more than what humans can see. We're also changing: UV runways that bees use to find flowers and access pollen; nectar (sugar) and pollen (protein) amounts and quality; and other ques insects use to find or assess the value of flowers, from electric charges to sounds. Until we fully study the thousands and tens of thousands of interactions occurring in even just a small locale between plants and insects, we can never know how cultivars compare to straight species. And if you ever see a cultivar that shows no pollen when the straight species does, know that we've effectively made the plant useless for bees even if we find the new form attractive.

Larval Host -- Different blooms are appealing to gardeners and designers (as well as the breeders and nurseries that sell them), but so are various leaf colors. But as you can imagine, similar issues arise when we alter leaf color as when we alter bloom color.  For example, the straight species of ninebark and elderberry have green leaves, whereas several cultivars of both have purple or plum. What happens now is that the insects who evolved to use these native plants to lay eggs and rear their young (caterpillars are one example), can no longer recognize the leaves when they taste them to lay eggs. And even if those eggs hatch, the leaves are now toxic to the larvae who starve. Two issues here are that if you want more butterflies and moths, you'll need to have more larvae; and if you want more birds, you'll need more insect larvae, since over 90% of songbirds feed exclusively insects to their young while they are in the nest (and we're talking hundreds of insects a day, both larvae and adults as well as spiders and beetles).

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What it Comes Down To
Trusting nature seems like a more sound option than trusting ourselves when we still know so very little. A few early studies have shown that changing the height or mature size of a native plant have minimal impact on supporting pollinators, but changing flower color and shape have more significant drawbacks. But even still, if we're going to buy a cultivar that is only somewhat different than the straight species, it's more often than not been cloned, and that's going to diminish the genetic diversity of the species -- especially if those plants breed with nearby wild (straight species) populations.

What's the Best Option?
Just as with human food systems, local may be best. In a perfect world we'd all have local and regional plant producers who grow their plants from responsibly collected wild seed of local remnant populations. This is called local ecotype or local genotype. These plants come from open pollinated seed and may be better able to withstand local weather and climate extremes while providing more resources for local wildlife (think about bloom times being in sync with pollinators who may use only the pollen from that species to feed their young, as is the case with ologolectic bees... and don't even get started about climate change altering bloom times so flowers appear weeks before the insect species that use them do). Of course, it's hard -- but not impossible -- to find nurseries selling local ecotype seeds and plants, but more and more are popping up in every state; I can think of several in Nebraska and Kansas, for example.

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What About Climate Change?
That's the kicker. Plants and animals are trying to move uphill and north in order to keep pace with the ecosystems and weather they evolved with -- such is the case for bumble bees who evolved in a cooler climate. But they'll eventually run out of habitat. Do we use plant species from a state south of us? Do we assist in migration? Do we just try to use any plant material from any region that can survive in the new climatic uncertainty? The answers to the above will be varied depending on profession, beliefs, and practical experience.

Personally, I fall on this line of reasoning -- we need to give local plant and animal populations as much chance to evolve and adapt as possible for as long as we can (this might be only decades or centuries, even so it's not enough time for most species to evolve). This means using local native plants with immediate or nearby genetic origins, plants wildlife and insects can recognize. Further, it means gardening in a different way -- reducing high input lawn, not using fertilizer or chemical sprays, keeping as much water on site as possible, using more plants period, and using plants to reduce the amount of energy my home uses (think shade in summer and wind block in winter).

If you'd like to help discover the roles cultivars play for pollinators, consider becoming a citizen scientist. Project BudBurst has an ongoing nativars research project you can join in on.

And if you'd like to get going on your native plant garden -- learning about your local ecoregion and the native plants that thrive there -- consider the online class Starting Your Native Plant Garden.

13 Comments
David Cristiani link
1/27/2019 11:13:59 pm

The topic of straight species and cultivars is worth exploring here, as I've heard suspicions but seen no hard evidence on that for some natives here. Assisted migration - even more interesting!

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Benjamin Vogt
1/28/2019 05:00:02 pm

I cite several specific studies in my book. ;) It's too bad most research is European or Northeast based.

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Carol Rice
2/2/2019 06:47:13 am

I have seen some reports of observations/studies about straight species versus nativars. This work seems to be gaining more attention, as the interest in natives and nativars expands. Changes that affect the pollinators access to pollen, or alter the leaf color (chemistry) seem to be the most problematic.

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Diana Studer link
1/28/2019 02:44:19 pm

Meanwhile insect Armageddon. They need all the help we can possibly give them.

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TimB
2/2/2019 07:49:36 am

Reading the work of Annie S. White (PHD University of Vermont; Owner/Principal Designer - NECTAR) reinforced what the pollinators were telling me - in almost all cases, the wildtype offered superior floral rewards vs. the nativar or cultivar of the species.
As to leaf color - selecting/breeding the reds for the human eye vs. pollinator & larval needs, the reds have increased levels of anthocyanins, a natural defense against being eaten. And if this coloring trait extends all the way to the pollen, does it constitute a further stress on the visiting species?

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Benjamin Vogt
2/2/2019 02:09:49 pm

That's something I wonder, too. I cited Annie's work in my book, but we need more regional studies. Or we can just trust nature.

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Loret link
2/5/2019 06:36:01 am

As always, great info and I appreciate the lighter side of your writing. Keep me laughing, Batman!

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Mye
4/27/2020 11:49:22 am

Honestly, in almost all cases, I find the straight species more visually pleasing. Typically, they're easier to get along with as well in that they offer up viable seed and ... Hooray for me! ... seedlings. It breaks my heart what they're doing to the regal Echinacea. The cultivar pictured above looks like a clipped poodle in my opinion.

I've been gardening with natives for about 25 years now. Nothing surpasses the beauty and majesty of the native American landscape. It's a rare beauty these days.

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Oliver
1/14/2021 01:45:52 pm

I planted Senna -cassia-. Of course early on I was just buying plants because. I can’t remember which, but I thought when I looked into it mine wasn’t the native one, either I got wild and maryland senna was the native, or I got Maryland and wild was native. Although now, I realize that both aren’t really native, barely on the edge for Kansas City. Bees seem to love them, they look great, they get massive. Do you think I should get rid of them? Or are those cassia selections ok for western Missouri?

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Benjamin
1/14/2021 02:01:58 pm

Senna marylandica is native to KC. In any case, they're both very closely related and both are host plant to some suplhur butterfly species. And as you note, bumble bee workers come in droves for the pollen.

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Heidi
11/24/2021 05:07:17 am

I appreciate the non-technical explanation. I continually find myself learning. Assisted migration, wow. Pollinator pathways.

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Rayma Delaney
3/1/2023 03:06:32 pm

Benjamin,
I’ve been immersed for weeks in planning a yard makeover (I’m also in Lincoln NE). Really appreciate your writing and honoring the natural world. My goals are to create a garden sanctuary, increase habitat for birds and pollinators, and shrink the turf. I recently stumbled into the straight species dialogue – wishing I’d found it much sooner, yet quickly embracing the reasoning. Doug Tallamy et al (including yourself) are convincing that even small spaces done right can make a big difference. My smallish space and limited full sun makes it tough to site most oaks (as a keystone plant). A dwarf chinkapin oak (quercus prinoides) – a NE native species - might work if something else gets eliminated in the plan. Everything is a trade-off. Despite being cultivars, would a columnar oak, e.g. Kindred Spirit or Skinny Genes, constitute any of the same value for caterpillars?

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Benjamin
3/1/2023 05:01:58 pm

I'm not familiar with those cultivars. You certainly don't want to alter leaf color. I'd prefer cultivars that are wild variants vs. bred with species from China or Europe, etc.

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    Benjamin Vogt's thoughts on prairie gardening in Nebraska. With a healthy dose of landscape ethics, ecophilosophy, climate change,  and social justice.

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