Arborist Podcast

Struggling to understand Cation Exchange Capacity (CEC)?This is the soil science concept that unlocks fertilization, pH, and nutrient questions on the ISA Certified Arborist exam. In this episode of the Arborist Podcast, we break down CEC from the ground up — starting with what a cation actually is, and building all the way to how CEC impacts sandy soils, clay soils, organic matter, and real-world...

This episode focuses on managing soil problems in urban environments for the ISA Arborist Certification Exam. Urban soils present unique challenges that affect tree growth, stability, and longevity. You’ll learn how arborists diagnose soil problems, set realistic expectations, protect existing soil and roots, and improve conditions where possible. This episode integrates everything covered in Doma...

This episode explains irrigation principles for trees for the ISA Arborist Certification Exam. Improper watering is one of the most common causes of tree stress, especially in urban landscapes. You’ll learn why trees are not lawns, how to apply water effectively, how soil type affects irrigation decisions, and why overwatering can be just as damaging as drought. This episode emphasizes biology-bas...

This episode covers water uptake, movement, and tree–water relations for the ISA Arborist Certification Exam. Understanding how trees absorb and move water explains drought stress, flooding damage, and many canopy symptoms. You’ll learn how roots absorb water, how transpiration drives water movement through the xylem, and how environmental conditions influence water stress. This episode connects s...

This episode explains soil organisms and the soil food web for the ISA Arborist Certification Exam. Soil biology plays a major role in nutrient cycling, soil structure, and long-term tree health. You’ll learn how bacteria, fungi, protozoa, nematodes, and larger organisms interact, how organic matter fuels soil systems, and why biologically active soils support healthier trees. This episode connect...

This episode focuses on soil compaction and its effects on trees for the ISA Arborist Certification Exam. Soil compaction is one of the most common causes of tree stress in urban environments and appears frequently on the exam. You’ll learn what compaction is, how it reduces pore space, why it limits oxygen and water movement, and how it restricts root growth. This episode also explains why compac...

This episode explains soil water movement, drainage, and aeration for the ISA Arborist Certification Exam. Understanding how water and oxygen interact in soil is essential for diagnosing both drought stress and flooding-related decline. You’ll learn the difference between gravitational water and plant-available water, what field capacity means, and why poorly drained soils often cause root stress...

This episode covers soil texture, soil structure, and pore space for the ISA Arborist Certification Exam. These physical soil properties determine how water and oxygen move through soil and explain why roots thrive in some soils and struggle in others. You’ll learn the differences between sand, silt, and clay, why soil texture does not change, and how soil structure and pore space can be improved...

This episode explains what soil is and why it is critical to tree health for the ISA Arborist Certification Exam. Soil is more than just dirt — it is a complex, living system that directly affects root growth, water uptake, oxygen availability, and long-term tree stability. In this podcast, you’ll learn what soil is made of, how mineral particles, organic matter, water, and air interact, and why p...

This video is a complete Domain 1: Tree Biology review for the ISA Arborist Certification Exam, designed to help candidates understand, connect, and retain the biological concepts that form the foundation of arboriculture. Tree biology is one of the most heavily tested domains on the ISA exam, and this video brings all required topics together in one structured, exam-focused overview. In this full...

Welcome to the Arborist Podcast, your go-to channel for mastering the science and skills behind professional tree care and ISA Certified Arborist exam prep! In this episode, we break down photosynthesis — the most essential process in all of tree biology — and explain how it directly impacts tree growth, canopy health, root development, and energy storage. You'll learn: What photosynthesis is...

This episode covers tree aging, decline, and death for the ISA Arborist Certification Exam. Not all decline is abnormal, and not all aging is unsafe. You’ll learn how arborists distinguish normal aging from serious decline. Designed for ISA Arborist Certification candidates preparing for diagnosis and risk topics. 🎥 Full video lessons available on YouTube Search: “Arborist Podcast” or visit: http...

This episode explains tree defense and compartmentalization for the ISA Arborist Certification Exam, including how trees respond to injury. You’ll learn why trees do not heal and how defense depends on energy and health. Ideal for ISA Arborist Certification candidates studying pruning and decay. 🎥 Full video lessons available on YouTube Search: “Arborist Podcast” or visit: http://www.youtube.com/...

This episode explains energy storage and transport in trees for the ISA Arborist Certification Exam. Energy balance controls growth, defense, and recovery. You’ll learn how carbohydrates are produced, moved, and stored in trees. Designed for ISA Arborist Certification candidates studying stress and decline. 🎥 Full video lessons available on YouTube Search: “Arborist Podcast” or visit: http://www....

This episode covers tree growth and development for the ISA Arborist Certification Exam, including primary and secondary growth. You’ll learn how trees grow taller, wider, and respond to pruning over time. Ideal for ISA Arborist Certification candidates studying structure and form. 🎥 Full video lessons available on YouTube Search: “Arborist Podcast” or visit: http://www.youtube.com/@arboristpodca...

This episode explains leaves and photosynthesis for the ISA Arborist Certification Exam. Leaves produce energy, regulate water loss, and indicate tree health. You’ll learn how photosynthesis, transpiration, and gas exchange affect growth and stress response. Perfect for ISA Arborist Certification candidates reviewing canopy biology.🎥 Full video lessons available on YouTube Search: “Arborist Podca...

This episode explains tree trunk and stem structure for the ISA Arborist Certification Exam, including bark, sapwood, heartwood, and growth rings. You’ll learn how stems support trees, transport water and energy, and influence structural stability. Designed for ISA Arborist Certification candidates needing a clear stem and trunk overview. 🎥 Full video lessons available on YouTube Search: “Arboris...

This episode focuses on tree roots for the ISA Arborist Certification Exam, covering root structure, growth patterns, and function. Roots control anchorage, water uptake, and energy storage. You’ll learn why most roots grow outward, not downward, and how soil conditions affect stability and health. This episode is essential for ISA Arborist Certification candidates studying tree biology and risk....

This episode explains tree cells and tissues for the ISA Arborist Certification Exam, focusing on xylem, phloem, and cambium. These tissues control water movement, energy transport, growth, and defense in trees. You’ll learn how internal tree structure explains pruning response, decline, and damage patterns tested on the exam. This video is for ISA Arborist Certification candidates who want to und...

This episode covers tree classification basics for the ISA Arborist Certification Exam, including broadleaf vs conifer, deciduous vs evergreen, and gymnosperms vs angiosperms. Understanding classification helps arborists predict tree growth, structure, and response to stress. You’ll learn how these categories overlap, why they matter on the exam, and how classification supports tree identification...

This episode explains what arboriculture is and what arborists do for the ISA Arborist Certification Exam. This short podcast video introduces the profession of arboriculture and explains why tree biology is the foundation of all arborist practices tested on the exam. You’ll learn how arboriculture differs from forestry, what responsibilities arborists have, and why understanding tree biology is c...