Clone and seedling tools for cannabis grows
Cloning environment, dome venting schedules, rooting timelines, germination planning. The first two weeks of any grow determine the next four months — these tools dial in the humidity, airflow, and timing that turn cuttings into rooted plants and seeds into healthy seedlings.
Cannabis propagation toolkit
Every propagation calculator in the cannabis suite. None are live yet — all currently in active build. Each tool will run with cannabis-specific defaults: clone-stage VPD targets, cannabis-typical rooting times by medium, photoperiod and autoflower germination behavior.
Cloning Environment & Venting Plan
Set initial cloning conditions and the day-by-day venting schedule in one tool. Day 1: closed dome at 95% RH, substrate at 78°F. Day 4: vent twice daily for 10 minutes. Day 7: reduce dome RH to 80%. Tool walks through the full 14-day arc from cutting to transplant.
Rooting Timeline Tracker
Track day-by-day expectations from cutting to transplant — what should be visible at day 3, day 7, day 14. Input your medium, day count, and observations; get diagnostics if you're behind schedule (no callus by day 5, no roots by day 14) and recovery suggestions.
Germination Calendar
Schedule seed soaking, paper-towel germination, transplant timing for cannabis seeds. Photoperiod and autoflower genetics germinate slightly differently — calculator accounts for both, plus medium choice (paper towel, direct sow, water glass).
Mother Plant & Cutting Selection
For growers maintaining mothers: input mother plant age + last-cut date, get how many viable cuttings you can take this round and which branches to select. Mothers can sustain ~10–20% of their mass as cuttings every 4–6 weeks before stress. Tool prevents over-harvesting.
Propagation hands off to veg
Cannabis propagation questions
How long do cannabis clones take to root?
7–14 days for most setups, depending on medium and conditions. Rockwool cubes with bottom heat and a humidity dome typically show roots at day 7–10. Soil clones run 10–14 days. Aero cloners can root in 5–7 days under optimal conditions but are unforgiving of timer or pump failures. If you don't see callus formation by day 5 or roots by day 14, something's wrong — likely substrate too cold, humidity too low, or rooting hormone applied wrong.
What humidity do cannabis clones need?
Start at 90–95% RH for the first 3 days. Vent the dome briefly (10–15 minutes) twice daily starting day 4 to harden off the foliage. By day 7, you can reduce dome humidity to 80–85% — clones with developing roots can transpire normally. By day 10, vent to 70–75%. By day 14 (when most clones have rooted), they should tolerate ambient room humidity of 50–60%. Skipping the gradual venting either damps clones off (closed too long) or wilts them (vented too soon).
Should I use rockwool, jiffy pellets, or soil for cloning?
Rockwool cubes are the home-grow standard — fast rooting (7–10 days typical), high success rate, easy transplant. Jiffy pellets are simpler for absolute beginners but compress as they hydrate which can choke roots. Soil cloning works but is slowest (10–14+ days) and harder to verify root development. For consistent results: pre-soaked rockwool cubes + bottom heat mat + dome + low-power LED. The Cloning Environment Planner (in development) will spec the exact targets per medium choice.
Do I need a heat mat for cannabis clones?
Yes, in most home setups. Cannabis clones root fastest at 75–80°F substrate temp — roughly 5–8 degrees warmer than ambient room temperature in most homes. A heat mat under the cloning tray maintains substrate temp without overheating the foliage above. Without one, substrate temp tracks ambient and rooting takes 50–100% longer. Cheap heat mats with thermostats run $25–35 and pay for themselves in faster rooting times.
How do I germinate cannabis seeds?
Three reliable methods. Paper towel: fold seeds in damp paper towels, place in a sealed container at 75–80°F, check daily, plant when taproots are ¼ inch (usually 2–4 days). Direct sow: plant seeds ¼ inch deep in pre-moistened starter cube or small pot, keep at 75–80°F substrate temp, sprouts emerge in 3–7 days. Glass of water: soak seeds for 18–24 hours then move to paper towel — risky if soaked too long, seeds can drown. Paper towel is the most-recommended method for first-time growers because you can see the taproot before transplanting.
How much light do cannabis seedlings and clones need?
Much less than veg or flower — 100–300 PPFD for the first 1–2 weeks. Strong light on undeveloped seedlings or unrooted clones causes stress (the plant can't transpire fast enough to support photosynthesis), leading to bleached leaves and stalled growth. Use a low-power LED (think 60W or less for a 2x2 prop area), set the photoperiod to 18/6 or 24/0, and keep the fixture 24–36 inches above the canopy for the first two weeks. Step up to full veg PPFD (300–600) only after roots are established.