Course 04 · Beginner
Soil, Substrates, and the Root Environment
Understand the small world around a tree's roots. Explore water, air, particles, and pots, compare materials by what they do, and build a practical substrate plan for your tree, climate, and care routine.
- 7 interactive lessons
- 2 quizzes
- About 1.5 hours
- Certificate of completion
Preparation: Course 01's lessons on roots, water transport, and mineral absorption, and Course 03's watering and observation principles.
Free to read. Create an account to save your progress and earn the certificate.
What you will be able to do
- Explain how particles, pores, and container geometry affect retained water and air around roots.
- Compare common and locally available substrate components by their properties, durability, cost, and sourcing.
- Distinguish pH, buffering, nutrient retention, soluble salts, and biological activity without treating one measurement as a diagnosis.
- Justify and prepare a documented working mix for a stated tree, site, container, and care routine, then test it without disturbing a live tree.
- Use changes in wetting, drying, structure, and root occupancy to decide what to investigate and when to plan further work.
Already caring for a tree?
Start with the lessons that matter this week.
These lessons help you understand the medium your tree already grows in:
- Lesson 2: Particles, pores, and retained water why a pot can drain freely and still hold water around its roots.
- Lesson 4: The container changes the result how pot depth and layers change the root environment.
- Lesson 7: Watching a substrate change what changed wetting or drying tells you to investigate.
Course outline
Section 1
Air, water, and container physics
Explore what roots need, look inside particles and pores, compare familiar materials, and see why the pot changes the result.
- Lesson 1: What growing media must provide9 min
What does a tree need from the material in its pot?
- Lesson 2: Particles, pores, and retained water10 min
Why does a pot still hold water after it stops dripping?
- Lesson 3: Comparing common components11 min
How can you compare ingredients without turning a trade name into a promise?
- Lesson 4: The container changes the result10 min
Why can the same mix behave differently in two pots?
- Quiz 1: Air, water, and container physics15 min
10 scored questions · 80% to pass · untimed, open book
Section 2
Choose, prepare, and observe
Connect chemistry and biology to a practical mix, compare small batches, and use a tree's history to distinguish maintenance from an urgent problem.
- Lesson 5: Chemical and biological properties11 min
What else matters when the particles and drainage look right?
- Lesson 6: Choosing and preparing a workable mix12 min
How do you turn substrate knowledge into a practical, testable plan?
- Lesson 7: Watching a substrate change10 min
When a mix changes, how do you decide what the tree needs next?
- Quiz 2: Choose, prepare, and observe15 min
10 scored questions · 80% to pass · untimed, open book
How completion works
- Read and explore. Take the lessons in order or jump to what you need. When you finish one, mark it complete.
- Pass the quizzes. Each of the 2 quizzes is untimed and open book, passes at 80%, explains every answer, and can be retaken as often as you like. Your best result is saved.
- Earn your certificate. When every lesson is complete and every quiz is passed, your Certificate of Course Completion is issued automatically and appears on your dashboard.
The certificate records your coursework. It does not certify hands-on technique or the readiness of any particular tree.
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