Warm-Season Perennials: Grazing Resilience for Extreme Weather
By Practical Farmers of Iowa
TL;DR: Integrate warm-season perennial grasses into grazing systems to build resilience against extreme weather, extend grazing seasons, and improve soil health.
- Warm-season perennials enhance drought and flood resilience.
- Combine cool-season grasses with warm-season annuals and perennials.
- These grasses thrive in high temperatures and poor soils.
- Strategic grazing extends seasons and prevents overgrazing.
- Diverse plant communities reduce drought susceptibility.
Why it matters: Integrating diverse forage systems helps livestock operations adapt to climate change, ensuring continuous productivity and ecological health amidst unpredictable weather patterns.
Do this next: Develop a grazing plan that strategically incorporates warm-season perennials and annuals into your existing forage system.
Recommended for: Ranchers and regenerative agriculture practitioners seeking to enhance their grazing systems' resilience and productivity.
This webinar focuses on building farm resilience against droughts, floods, and extreme weather through practical grazing strategies integrating warm-season perennials into livestock systems. It provides field-tested techniques for regenerative agriculture practitioners aiming to create adaptive forage systems. Key methods include developing grazing plans that combine cool-season perennials with warm- and cool-season annuals and warm-season perennials like switchgrass, big bluestem, little bluestem, and indiangrass. These perennials are highly adapted to warm temperatures, offer extreme drought resistance, and perform well on shallow or poorly drained soils, yielding 3 to 3.8 tons per acre even under stress conditions where cool-season grasses falter. The webinar emphasizes extending the grazing season significantly while avoiding overgrazing and maintaining soil health. Practical details cover establishment challenges, as these grasses are hard to establish but should be managed for long-term production. Integration strategies highlight using warm-season annuals like sudangrass, sorghum-sudangrass, and pearl millet for summer grazing, germinating at soil temperatures of 65°F and thriving up to 90°F or higher. Resilience is enhanced by diverse plant communities that reduce susceptibility to drought timing, as cool-season grasses rely on April-June precipitation while warm-season ones use June-September rains. Nutritional benefits include higher protein and energy in vegetative stages, better harvest efficiency through uniform grazing distribution, and promoted regrowth in moist conditions. Management triggers for droughts and disturbances are critical, with no one-size-fits-all approach—each ranch needs a tailored plan. Avoiding early grazing during transition periods is vital to prevent root damage, disease, insects, and weed invasion; taller stubble heights promote carbohydrate storage for regrowth. Rotational stocking is recommended over continuous to control intensity, improve livestock distribution, and maintain optimal stubble heights for species persistence, as supported by studies showing 85% better forage quantity. Insights from experts like those at USDA-ARS Pasture Lab underscore these perennials' role in regenerative systems for livestock integration, offering concrete steps for permaculture and self-sufficiency.