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Cannabis Cultivation and Science Podcast: Daily Summaries Delivered
by Tad Hussey
Welcome to the Cannabis Cultivation and Science podcast, I’m your host, Tad Hussey of KIS Organics. This is the podcast where we discuss the cutting edge of organic growing from a science based perspective and draw in top experts from around the industry to share their wisdom and knowledge. If you want to hear the latest in growing technology and methods, this is the place.
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- 6 days ago1h 11m
Episode 166: Debunking Cannabis Cultivation Myths with Dr. Deron Caplan
In this conversation, host Tad Hussey (KIS Organics) and Dr. Deron Caplan (CannaCribs Horticulture Consulting) discuss the intersection of agricultural science and commercial cannabis cultivation, focusing heavily on irrigation, lighting, and research methodologies. Drought Stress vs. Drybacks: Dr. Caplan clarifies a major industry misconception by distinguishing standard irrigation "drybacks" from actual "drought stress." He explains that drybacks work primarily by pulling oxygen into the root zone (which cannabis loves), whereas true drought stress requires pushing the plant past the point of water availability. The Nuance of Cannabinoid Bumps: While Dr. Caplan’s landmark PhD research found that controlled drought stress in week seven of flowering could boost THC/CBD content by 30% to 40% without losing yield, he notes that repeating this in smaller pots with faster drybacks yielded no positive results. This highlights just how incredibly nuanced and difficult it is to trigger beneficial plant stress without harming the crop. Organics vs. Mineral Salts at Scale: The two debate the logistics of commercial cultivation. While mineral salts offer strict baseline consistency and easier pathogen sterilization for medical export markets, Dr. Caplan notes that data-driven, evidence-based living soil systems have come a long way and are proving to be increasingly scalable. Debunking the Leaf-Tip Cloning Myth: Dr. Caplan shares that his early research on propagation disproved a ubiquitous legacy market myth: cutting the tips off clone leaves actually reduces rooting success, unless leaves are so large that they are actively shading adjacent clones. Advanced Canopy Management: They discuss the massive yield and quality benefits (15% to 20% increases) of under-canopy lighting (UCL). Dr. Caplan details how commercial facilities can use a PAR meter to calculate the Leaf Area Index (LAI) to mathematically standardize how much foliage to prune, rather than relying on visual guesswork. The Future of Research: Dr. Caplan highlights his new commercial R&D facility in Canada designed to test applied science practices. They close by discussing the validity of peer-reviewed data versus private white papers, concluding that regardless of a grower's background, scientific data is the ultimate tool for bridging the gap between organic and conventional cultivation. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- 4 weeks ago1h 6m
Episode 165: Boosting Yields 50% with a 13-Hour Photoperiod? Debunking Cannabis Science with Dr. Youbin Zheng
In this episode, we discuss: Bridging the Genetic Gap: Looking critically at how horticultural research transfers between high-THC cultivars and industrial hemp. The 13-Hour Photoperiod: Breaking the traditional 12/12 cycle to achieve a 39%–50% yield increase and a 9% THC boost. Linear Light Scaling: The direct relationship between light intensity and flower yield scaling all the way up to 1,800 micromoles under ambient CO2. The UV Reality Check: Why modern high-THC genetics actually showed a decrease in final cannabinoid and terpene content under supplemental UVA and UVB. Light Response Curves: Why relying on a single leaf measurement to guide your facility's light saturation point is fundamentally flawed. The Veg-to-Flower Transition: Practical SOPs for adjusting PPFD and DLI safely without shocking your canopy. Controlled Deficit Irrigation: How a single, targeted late-flower drought stress event triggers a 12%–13% spike in final THC and CBD content. The 60 PPM Phosphorus Rule: Looking at the established replication data proving that excess phosphorus wastes money, reduces yield efficiency, and impacts the environment. Links & Resources Mentioned in This Episode: Visit KIS Organics for commercial living soils, amendments, and consulting: https://www.kisorganics.com Grab Dr. Zheng's textbook, Handbook of Cannabis Production in Controlled Environments: https://www.amazon.com/Handbook-Cannabis-Production-Controlled-Environments/dp/0367712571 Access Dr. Zheng’s open-access research papers on Google Scholar: https://scholar.google.com/citations?user=ciGdnWAAAAAJ&hl=en Connect with us on Instagram: @kisorganics Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Apr 29, 20261h 5m
Episode 164: Mycotoxins & Microclimates: The Science of Cannabis Pathology with Dr. Nicole Gauthier
o keep the audience engaged while highlighting the technical value of the episode, this version focuses on the "why" and the high-level takeaways, leaving the "how" for the audio. Podcast Summary In this episode, Tad Hussey of KIS Organics talks with plant pathologist Dr. Nicole Gauthier to separate fact from fiction regarding cannabis pathogens. The discussion moves past the basics of "mold" to look at the specific science of Fusarium, Botrytis, and the reality of mycotoxins in the supply chain. From the limitations of soil testing to the importance of bud microclimates, Dr. Gauthier provides a professional framework for understanding how plant diseases actually function and how to manage them without relying on "curative" myths. Key Takeaways The Mycotoxin Reality: Why species identification matters more than ever, and a look at which common pathogens actually pose a toxic risk to consumers. Microclimates vs. Room Environment: Understanding why your sensors might say your room is safe while your "chunky buds" are harboring high-humidity infections. The Problem with Broad Testing: A critical look at why generic soil tests and "Total Yeast and Mold" plates often provide misleading or incomplete data for growers. Biological Controls & SAR: The science of "priming" a plant’s immune system and the differing persistence levels of Bacillus and Trichoderma on the leaf surface. The Pathology "Lightning Round": Dr. Gauthier’s professional advice on sanitation protocols, rogueing diseased plants, and the most effective ways to manage an outbreak. Featured Expert Dr. Nicole Gauthier is a researcher and extension specialist at the University of Kentucky. Her work focuses on sustainable disease management and helping growers navigate the intersection of plant health and regulatory compliance. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Apr 21, 20261h 2m
Episode 163: Concrete Botany: Reconnecting with the Living World in the Age of Disturbance with Joey Santore
Key Takeaways & Discussion Highlights The Railroad Roots: Joey’s transition from a Union Pacific engineer to a "vigilante botanist." He discusses the influence of Carl Sagan’s The Demon-Haunted World and using science as a "candle in the dark" in a consumerist society. Botany for the "Jaded Working Class": Why academic botany often fails to connect with the public and why Joey targets the "cynical, maladjusted stiff" who needs the living world the most. Horticultural Atrocities: A critique of "horticultural fluff"—boxwoods, crepe myrtles, and cloned cultivars that offer no ecological value. Joey explains why he’d rather see a lawn than a line of "garbage" cultivars. The Concrete Cage & Mental Health: How our disconnection from the land and our "unwalkable sprawling excerpts" contribute to a massive mental health crisis. The Field Record: Joey’s process in the wild—using iNaturalist, herbarium vouchers, and photography to document the "living machine." Geology & Evolution: An exploration of edaphic endemics (plants that grow only on specific soils like serpentine or gypsum) and how stressful geology creates new species. Disturbance Ecology: Why "weeds" are actually pioneer species and how disturbance—when understood correctly—is the engine that enables diversity. Beyond "Is it Edible?": Why the question "Can I eat it?" is the most common and least interesting way to interact with a plant. Concrete Botany: A preview of Joey’s new book and his fascination with "unintentional ecology" in neglected urban spaces like railroad tracks and abandoned warehouses. Resources Mentioned Book: Concrete Botany: The Ecology of Plants in the Age of Human Disturbance (Released April 2026) YouTube/Podcast: Crime Pays But Botany Doesn’t App: iNaturalist (Joey’s primary tool for citizen science) Literature: The Demon-Haunted World by Carl Sagan Project: Thornscrub Sanctuary (South Texas conservation) Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Apr 7, 202655 min
Episode 162: Dips, Sprays, & Phytotoxicity: Mastering Oils in Cannabis Cultivation with Julie Graesch
Why can't you just use canola oil from your kitchen to kill spider mites? If you’ve ever wondered about the true science behind oil-based pesticides, this episode is a deep dive into the physics and chemistry of plant protection. Tad and Julie Graesch explore why oils remain one of the most effective tools for managing resistant pest populations like two-spotted spider mites and thrips. In this episode, we cover: Physical Modes of Action: How oils kill through suffocation and desiccation, and why pests can’t develop resistance to being physically smothered. Mineral vs. Essential Oils: The functional differences between horticultural mineral oils (like SuffOil-X) and 25B essential oils (like Epishield). The Power of Formulation: Why inert ingredients, surfactants, and molecular weight are just as important as the active ingredients for preventing phytotoxicity. Dipping vs. Spraying: The high-stakes world of plant dips and how to target specific life stages—including the elusive thrips egg. Tank Mixing & Compatibility: Best practices for combining oils with microbials like Beauveria bassiana to create a synergistic knockdown effect. Whether you are a small-scale hobbyist or a large-scale commercial cultivator, understanding how to master oils will help you maintain a cleaner garden with fewer chemical interventions. You can order Bioworks products through KiS Organics, just reach out if you have any questions. About the Guest: Julie Graesch is the Technical Services Manager for BioWorks. With over 18 years of experience as a biological scientist, Julie has worked in laboratory, greenhouse, and field research, specializing in integrated pest management (IPM) for the horticulture industry. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Mar 17, 20261h 10m
Episode 161: The Secret Lives of Pathogens with Dr. Zamir Punja
Key Takeaways for Cultivators The Week 3 Strategy: Preventive sprays for Botrytis must occur when the flowers are still small and "open." Once the bud swells (Weeks 6+), the pathogen is already locked inside. Airflow is Everything: Buds act as heat sinks. Use fans 24/7 to cool the internal temperature of the flower, which is significantly higher than your room’s ambient temperature. Identify Your Mold: If your bud rot looks pink or white rather than grey, it may be Fusarium. This is a systemic issue that requires a different mitigation strategy and poses a mycotoxin risk. HLVd Survival: In living soil, HLVd may break down much faster than on sterile surfaces because the microbes decompose the host root tissue. Watch the Silica: Over-applying potassium silicate can cause the plant to excrete white crystals onto the leaves and stems—don't mistake this "silica vomit" for PM or resin! Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Mar 10, 20261h 17m
Foundations Series #5: Reading the Soil: Agronomy, Soil Testing & Crop Health with Lee Briese
Key Topics & Notes • Why experienced crop consultants rely heavily on chemical soil analysis for making management decisions biological soil testing soil structure and aggregation play a critical role in plant health walking fields and directly interacting with soil medical diagnosis — identifying root causes rather than symptoms Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
- Mar 3, 20261h 9m
Foundations Series #4: What's Your Garden Missing? Cracking the Code of Applied Horticulture with Don Marshall
Key Takeaways: Botany vs. Hacks: Moving past "quick fixes" to understand the biological lens of plant science. The Limiting Factor: Learning to identify the specific environmental or nutritional gaps holding your plants back. Timeless Principles: Why botanical fundamentals are the most reliable tools in a cultivator’s shed, regardless of changing trends. Applied Horticulture: Bridging the gap between academic theory and high-level landscape maintenance. About Don Marshall: Don is a Certified Professional Horticulturalist, Certified Arborist, and ecoPro. He founded the Environmental Horticulture program at Lake Washington College, where he taught for over 40 years. He is the owner of Plant Designs, a fine gardening firm, and the co-author of Home Landscaping, Northwest Region. The Botany Foundations Course: Don and I have spent the last few years collaborating on a comprehensive online botany course. We designed this specifically for industry professionals and serious growers who want a university-level understanding of plant science without the time constraints of traditional schooling. This course provides the professional lens needed to evaluate and improve your grow. Stay Updated: www.kisorganics.com Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
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About Cannabis Cultivation and Science Podcast
Welcome to the Cannabis Cultivation and Science podcast, I’m your host, Tad Hussey of KIS Organics. This is the podcast where we discuss the cutting edge of organic growing from a science based perspective and draw in top experts from around the industry to share their wisdom and knowledge. If you want to hear the latest in growing technology and methods, this is the place.
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