Seed Starting Masterclass
A packet of seeds costs less than one nursery transplant and holds forty of them - if you can get them from packet to garden alive. This is our deep track on exactly that: the biology that decides whether a seed wakes up, a setup that fits a real house, the first week where seedlings are won or lost, and the hardening-off bridge that most beginners skip and most dead transplants died on. Read it in order, or jump to the module you need.
Want the dates and numbers while you read? Keep the frost-date sowing calendar, the seed chart (soil temps, depths, days to germination for 41 crops) and the succession planner open beside this track.
Module 1 · The Setup
Everything before the first seed: how germination actually works, the gear that matters (and the catalogue theatre that does not), lights that prevent leggy seedlings, and the mix seeds want to sprout in.
How Germination Actually Works A seed is a packed lunch with instructions. Water, oxygen and temperature as the three switches, light and dark germinators, dormancy tricks like stratification, and how long seeds really stay alive. Core 10 min 2 
The Setup: Space, Trays & Heat You need less than the catalogues say. Cell trays versus soil blocks versus yogurt pots, what a heat mat actually changes, shelf math for a real house, and three honest budget tiers. Core 11 min 3 
Lights, Not Windowsills The windowsill is where seedlings go to get leggy. Why even a south window is not enough in late winter, cheap shop lights versus 'grow' lights, hanging distance, and the 14-16 hour rule. Core 11 min 4 
The Mix: What Seeds Sprout In Fine, clean and nearly empty - a good seed mix is closer to a sponge than to soil. What the bags actually contain, a DIY recipe that works, the peat and coir question, and why garden soil fails indoors. Core 10 min Module 2 · The Craft
The hands-on part: sowing at the right depth on the right date, running the critical first week of water and warmth, and diagnosing every classic seedling problem before it wins.
Sowing Like You Mean It Depth, spacing, labels and the calendar. The depth rule that covers almost every seed, counting back from your frost date, multi-sowing the crops that like company, and the record-keeping that pays off next year. Core 11 min 6 
Water, Heat & the First Week The week where most seedlings are won or lost. Bottom watering as the default, what the humidity dome is for (and when it must come off), heat mat timing, and heading off damping off before it starts. Core 10 min 7 
Troubleshooting: Leggy, Yellow & Sulking Read the symptoms like a pro: stretched stems, yellow or purple leaves, white fuzz, fungus gnats, patchy germination and seedlings that simply stall - what each one means and the fix, in order of likelihood. Advanced 12 min Module 3 · To the Garden
Where the head start pays off or dies at the finish line: potting up cleanly, the two-week hardening-off bridge, and a transplant day that ends with plants that never look back.
Potting Up Without Casualties When roots hit the walls, it is moving day. The true-leaf signal, handling seedlings by the leaf and never the stem, which crops can be planted deeper, and when to start feeding (gently). Core 10 min 9 
Hardening Off: The Two-Week Bridge Indoor seedlings are soft - sun, wind and cold nights will shred them without a transition. The day-by-day protocol, what hardening physically changes in the plant, cold frames, and the shortcuts that cost you plants. Core 10 min 10 
Transplant Day & the First Two Weeks The handover to the garden: picking the day and hour, planting technique by crop type, watering in properly, cutworm collars and row cover, and the aftercare fortnight that decides whether the head start was worth it. Core 11 min The lesson that saves the most plants
Nothing kills more healthy seedlings than skipping the transition to outdoors. If you read one part of this track, read the hardening-off protocol - two weeks of gradual sun, wind and cool nights that turn soft indoor growth into a plant that can take the garden.
Hardening off: the two-week bridgeSeed-starting kit
Links go to Amazon or a partner store (such as Adagio Teas) and may earn us a commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. We link gear types, not sponsors' picks: you choose the exact product.