Tag Archives: when to burn

How to Recognize Bad Prairie Stewardship Advice

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Public Service Announcement: There are lots of good ways to restore and manage prairies for biodiversity, wildlife habitat, livestock productivity, or other objectives. Beware anyone who says otherwise.

Prairies can be managed in many different ways and maintain their resilience, diversity, and beauty.

You’ve likely come across people, either in person or online, who confidently proclaim that they know the best way to manage land. Often, their proclamation is accompanied by derogatory remarks about people who choose not to follow their recipe. It’s very frustrating. It’s also dangerous because people with loud, assertive voices can be very convincing to people looking for advice or exploring ideas. If you follow current events, you may have noticed this phenomenon in other contexts besides just land management.

Anyone who tells you they know the best or only good way to do something is usually trying to sell you something, trying to get you to join their cult, or is delusional and/or misinformed. In fact, all those may apply simultaneously.

In terms of grassland stewardship, I often see this sort of blanket statement made with regard to fire or grazing strategies, prairie restoration/reconstruction techniques, or invasive species management approaches.

“There’s only one correct time of year to burn.”

“This is the best grazing system to build soil health.”

“Your prairie planting will absolutely fail if you don’t mow weeds twice during the first field season.”

“Only my particular herbicide recipe and approach will control that invasive plant.”

And so on.

As someone who is frequently asked for advice and sometimes gives it unsolicited, I try hard not to make those kinds of statements. There are many times I’ve talked about strategies we’ve had good luck with, or the reasons we are adopting or testing a particular approach. I hope I’ve always couched those statements in ways that don’t make it sound like our way is the only or best way to do things. I’ve definitely gotten better at it as I’ve gotten older and more experienced, continuously learning how complicated prairies really are. Please call me out if I don’t follow my own guidelines.

Summer fires can produce very different results from spring or winter fires, but those results can vary widely between sites. They can also vary between years at the same site. Prairies are complicated.
There are definitely ways cattle grazing can degrade the health of prairies but there are also many different ways cattle grazing can increase or sustain plant diversity, soil health, and wildlife habitat.

There are obviously some wrong ways to manage prairies, but you’ve got to get pretty drastic before I’d toss you in that category. Spraying an entire prairie with a broad spectrum herbicide might be one example. Plowing the prairie and planting soybeans might be another. Short of those, I would hesitate to automatically characterize many actions as wrong or catastrophic. I might express some serious concern, or raise some issues to consider, but who am I to tell you what’s right or wrong in your situation?

Experienced land managers know it takes a lot of trial and error and close observation of results to find effective management or restoration strategies at a particular site. It takes multiple points of evidence to see a pattern. Even then, most of us are frequently surprised by the results of a treatment, even if we’ve used it many times before. Individual results may vary, etc.

There are lots of reasons that what works at one place might work differently for you. Sites vary in soil type, topography, plant and animal composition, past management history and size, just to name a few. In addition, the surrounding landscape has a huge impact on what happens within a site. Is the site adjacent to land with lots of trees, shrubs, or invasive plants crawling over the boundary? Is it ensconced within a matrix of cropland where it could be difficult for most animal species to repopulate your site if they are locally extirpated? Or are you fortunate enough to be in a landscape with lots of other prairie habitat around?

In addition, objectives can vary between sites. You might have a very different vision of what you want your prairie to look like than the person trying to sell you their particular brand of snake oil. (Tangentially, you never see snake oil on the market anymore, do you? The world has sure changed, huh?) Anyway, the point is that you might be aiming for different outcomes than the person giving you advice.

For example, you might have a particular bird, wildflower species, or insect that you really care about and/or that is rare elsewhere. If so, you might want to tailor your management to make sure you meet the needs of that species. Alternatively, you might have an affinity for pollinators, song birds, or slugs (no judgement), any of which might affect how you decide to manage and evaluate the results. If you’re a livestock producer, you likely have strong opinions or needs related to weaning weights, calving dates, marketing strategies, labor availability, and/or many other factors.

I don’t think I’ve yet met someone who is catering their prairie management around slug habitat needs but I bet I’ll enjoy talking to that person if I ever do meet them.

The people giving you advice almost surely don’t share all your precise objectives or limitations. Because of that, feel free to experiment. It’s always a good idea to talk to experienced people, both locally and otherwise, to learn what others are doing and what has and hasn’t worked at their places. That’s a great way to get ideas that can help you solve a challenge you’re facing, or to consider something you’d previously ignored. But you absolutely shouldn’t feel obligated to simply copy and paste their approaches. In fact, I’d encourage you not to.

If you have an idea you think might be risky, don’t dismiss it out of hand. Just experiment with it on a small part of your site before you scale it up. It’s no different than testing a new wood stain in an inconspicuous area or trying out a new hair dye on your little brother or sister before applying it to your own head. Please don’t be afraid to try new ideas though – it’s how we learn.

Most importantly, be a good observer. Pay attention to what happens after each restoration or management action. Learn as much as you can about different species and groups of plants, animals, fungi, etc., so you can better evaluate habitat and treatments through their eyes. Read, listen to, and talk to experts coming from lots of perspectives and ask hard questions. Then adapt, adjust, and tweak your strategies every year based on what you see and learn.

If you do this well, you’ll probably enjoy land stewardship and keep improving your expertise and abilities, though you’ll almost surely never feel like you’ve got everything figured out. This is a good thing. It’ll keep you humble and hungry to keep learning. If you’re lucky, it might also prevent you from starting a cult or trying to hoodwink people into joining it. Thank you in advance for that.

What’s the Best Burn Schedule for Prairies?

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Fire has been part of prairie ecosystems for as long as prairies have existed.  In many parts of North America, prairies both came into existence and then persisted because of intentional and thoughtful application of fire by Native peoples.  Forces such as drought and lightning, intertwined with human management, have helped maintain prairie habitat for millennia.  Fire, people, and prairies are inextricably linked.

Great!  So how often should I burn my prairie?  And what time of year should I burn it?

Ok, hang on. 

While those questions are reasonable in the right context, they’re almost useless on their own.  You’d never ask an experienced baker, “hey – how much flour should I use and when do I add it?”  The obvious response would be, “I don’t know, what are you trying to make?”

Prairie burns should be conducted for specific reasons, not just because the calendar says it’s time to burn.

There is no set recipe for good prairie management.  If prairies are anything, they are dynamic.  That dynamism necessitates an adaptive approach to management.  Burning, like all other management treatments, should be part of that approach.  Every fire should be planned and conducted on its own merits, not as part of a pre-planned schedule.

Weather fluctuations, alone, can strongly influence the growth and flowering of plants.  Insect populations are directly tied to weather as well, but also linked to what happens to plants.  Because so many other species eat, or are eaten by insects, anything that affects them ripples through the entire ecosystem. 

The fickleness of the weather can make a prairie act very differently from one year to another.  On top of that, the behaviors of invasive species, disease organisms, herbivores, pollinators, predators, and other members of prairie communities are also driven by complex, interconnected, and unpredictable forces.  It’s a big, glorious mess.

As a result, the answer to how a prairie should be burned depends on lots of factors. What is your overall objective for your prairie management?  What has the weather been doing?  How did prairie communities respond to recent management treatments (fire or otherwise)?  What are the significant invasive species threats and what influences their ability to become dominant?

This site was burned to control eastern redcedar trees. The timing of the burn was aimed at creating enough localized heat to kill the target trees.

Even bakers don’t always follow a fixed recipe.  Based on how the dough is shaping up, they might add a little extra flour – or not.  Factors like humidity and altitude cause ingredients to act and interact differently and it’s not always possible to accurately predict those responses.  As a result, bakers are constantly testing, learning, and adapting. 

Prairie management has to be even more flexible and adaptive than baking.  Knowing what the average historic fire frequency was in your area is instructive, but it shouldn’t necessarily dictate how often you burn your prairie.  You should be burning when/if it will help you achieve your broader objectives, and if your recent observations show that it would be helpful.

Scientists and historians have estimated historic fire frequencies for most prairie regions.  That’s interesting information, but remember that those are based on long-term averages, which smooth over a lot of variation.  You can be sure the people setting fires centuries ago weren’t gridding out the landscape and deciding when to burn a patch based solely on a regimented schedule.  They burned when it made sense for their objectives, which means some areas surely burned more frequently than others.  Lightning fires, too, would have ignited on irregular schedules, driven by the capriciousness of forces like thunderstorms, drought cycles and grazing.

Historic fire frequencies are mathematic syntheses of irregular events, they’re not instruction manuals.  At their best, they can help us understand the kind of world prairies evolved in.  That’s definitely useful, but the world is significantly different than it used to be, so what might have been appropriate in the past might not always apply today.  Use history as context, not as a template to be blindly followed.

There is much discussion about how common summer fires were in historical prairies. That’s an interesting conversation, but it’s even more important to evaluate what the impacts of summer fires are today and how they might (or might not) achieve local objectives.

Similarly, the optimal seasonal timing for a burn should be based on what you want to accomplish with that particular treatment.  What timing will make the most sense for your objectives?  What are the potential negative consequences of that timing?  The predominant season of fires hundreds of years ago helped shape today’s prairies, but – just as with fire frequencies – that history shouldn’t be the only guide to what we do now. 

With regard to both the seasonal timing and frequency of fires, it can also be important not to get locked into a rigid pattern.  Every fire has both positive and negative consequences.  If you always burn at the same time of year, the same species will always be negatively impacted, and that will surely include some species you don’t want to suppress.  Mixing up the seasonality of burns now and then can help ensure you don’t drive any species to local extinction.

Burning on the same schedule over many years in a row can also cause problems.  Regardless of what frequency you choose, there will be some species that thrive in that regime and others that don’t.  If you don’t ever vary the pattern, you risk losing the species that aren’t suited to it.

Most importantly, be sure there are adequate unburned refuges available any time you burn so you don’t eradicate whole populations of animals (especially invertebrates).  Again, every fire has negative consequences, no matter the timing.  Populations of some species will likely be wiped out, or nearly so, within the burn footprint. 

This beetle was fortunate to find a mini refuge within this fire and will probably survive, but many of its peers might not have been so lucky.

In landscapes with lots of prairie, affected species can probably recolonize from nearby unburned areas – though that process may take more than a year or two.  That recolonization works much less well in fragmented landscapes.  If you burn the only 40 acres of prairie within miles, populations of animals that perish in the fire are unlikely to re-establish.  Even if there is other grassland habitat around, you might have invertebrates in your prairie that are tied to plant species not present in those neighboring habitats.  That will put those invertebrates at risk of local extinction if a burn snuffs out their entire population.

This summer burn covered only a portion of the management unit and there is a lot of other prairie habitat nearby to supply recolonizers from any species negatively impacted by the fire.

Prescribed fire is a powerful force in prairies.  Every fire has both positive and negative consequences, driven by the timing and frequency (as well as its intensity) of its application.  Prescribed burning should be used as part of an adaptive management approach.  Every management treatment (fire, grazing, mowing, herbicide application, etc.) should be applied when it will help achieve objectives and in response to observation and evaluation of what’s happening on site.  After all, smart bakers and prairie managers both know it’s risky to rely too much on a set recipe. 

You might say they both knead to be adaptable and roll with the punches. 

…Or you might not. You might not say that at all.

Hey!  Some of you might remember Evan Barrientos from when he was a Hubbard Fellow about six years ago.  Evan’s doing great work these days as a conservation photographer, videographer, and storyteller.  His latest personal project is called Fireforest.  It’s a terrific examination of the role of fire in Colorado forests – I encourage you to check it out!