Go deeper
Follow the roots.
Start with practical growing references. Then wander into books, films and communities. A compelling story can inspire a question; it does not settle the evidence.
Choose regional extension guidance for plant care. Treat practitioner books and forums as experience to investigate, and films as storytelling. Before paying for a course, check the teacher, curriculum, local relevance and current terms. No course is required to start a small garden.
Evidence & practical growing
Public agencies and extension references used in these guides. Apply their regional context.
Food forests & soil biodiversity
npj Biodiversity · 2026 research
A comparison of 15 Northwest European food forests and nearby land uses. Promising differences, with important limits by organism group and study design.
ReferenceWhat temperate food-forest research covers
Agroforestry Systems · scoping review
A map of 50 empirical studies and the questions that still need stronger experiments and longer follow-up.
ReferenceNational Agroforestry Center
USDA Forest Service
Definitions, practices and research across agroforestry systems.
ReferenceGrowing apples
University of Minnesota Extension
A concrete example of fruit-tree needs: sun, pollination, pruning and time to fruit. Cultivar advice is regional.
BeginnerSoil health on cropland
USDA NRCS
The soil-health principles behind cover, living roots, diversity and reduced disturbance.
ReferenceNitrogen release from cover crops
SARE
Why nitrogen-fixing plants do not act like an instant fertilizer delivery service.
IntermediateInvasive plant information
USDA National Invasive Species Information Center
Look up a plant, then check the authorities for your location before introducing it.
ReferenceSoil testing for lawns and gardens
University of Minnesota Extension
Which tests answer which questions, including when a routine fertility panel is not enough.
BeginnerBooks
From gentle first reads to the field-defining manuals.
Gaia's Garden: A Guide to Home-Scale Permaculture
Toby Hemenway
A widely read introduction to home-scale permaculture. Read its planting ideas alongside current local guidance.
BeginnerCreating a Forest Garden
Martin Crawford
A detailed temperate forest-garden manual from the steward of the Dartington garden; a practitioner perspective.
IntermediateEdible Forest Gardens (Vols. 1 & 2)
Dave Jacke & Eric Toensmeier
The deep technical reference for designing temperate food forests, guild by guild.
ReferencePermaculture: A Designers' Manual
Bill Mollison
The 576-page foundational text and the basis of the Permaculture Design Certificate.
ReferenceRestoration Agriculture
Mark Shepard
Perennial agriculture at farm and broadacre scale — permaculture for real-world farmers.
IntermediateDirt to Soil
Gabe Brown
An accessible, first-hand regenerative-agriculture story from one of its most influential voices.
BeginnerFilms
Stories to inspire questions, not substitutes for research.
Kiss the Ground
2020 · narrated by Woody Harrelson
The documentary that brought regenerative agriculture and soil carbon to a mass audience.
BeginnerThe Biggest Little Farm
2018 · John & Molly Chester
A visually rich account of building a diversified farm. It is a film about one project, not a controlled comparison of farming methods.
BeginnerOrganizations
Research, teaching, and community, worldwide.
Permaculture Research Institute
Geoff Lawton’s global education and demonstration network, based at Zaytuna Farm.
Agroforestry Research Trust
Martin Crawford’s UK charity — forest-garden research, plants and seeds, and courses.
Rodale Institute
An organization researching and advocating organic and regenerative farming. Read individual studies for methods and limits.
Kiss the Ground
A nonprofit advocating for regenerative agriculture and healthy soil as climate solutions.
Learning with people
Go deeper with courses and hands-on time.
Permaculture Design Certificate (PDC)
A common introductory training format. Providers and quality vary; a certificate is not a professional horticultural licence.
BeginnerPermies.com
A large forum for questions and practical experience. Verify plant, safety and ecological claims against reliable local sources.