Home, Garden & Craft - 5 free documentaries about gardening & growing.
Start with Arduino Garden Controller - Automatic Watering and Data Logging (9 min, Practical Engineering), then How To Upkeep A Scenic Paradise (47 min, CNA Insider). All 5 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on gardening & growing is The Well-Tempered Garden by Christopher Lloyd.