What are the ways to tell if my seed is good and what can I do to maximize its germinating potential?
Seed Revival & Viability Testing Guide (Cannabis)
STEP 1: Float Test (Basic Viability Check) ✅ What It Does: Checks seed density — viable seeds usually sink. Instructions: Fill a shot glass or cup with clean, room-temperature water. Drop the seeds in. Wait 2–12 hours. If the seed; Sinks: It is usually viable Floats: May be weak or dead Eventually sinks: Possible slow starter
❗ Don’t leave seeds in water beyond 24 hours unless you're starting germination.
STEP 2: Seed Cleaning (Optional for Old Seeds) Purpose: Removes mold spores or pathogens before soaking. Soak in: 3% hydrogen peroxide diluted 1:1 with water Soak for 15 minutes, then rinse with distilled water
✂️ STEP 3: Scarification (If Shell is Too Tough) Purpose: Helps older seeds or those with thick shells to absorb water. Methods: Sandpaper Method: Gently roll seeds between 2 pieces of fine sandpaper or an emery board. Scuff only until the shine dulls. Nick the Seam: Use a sharp needle or razor to make a tiny nick on the seam of the seed (advanced and risky — do only if necessary). Don’t break through the shell completely. You want abrasion, not damage.
⚗️ STEP 4: Gibberellic Acid Soak (For Truly Old or Dormant Seeds) What is it? Gibberellic acid (GA₃) is a natural plant hormone that breaks dormancy and triggers germination — especially useful for seeds 2+ years old. How to Prepare: GA₃ Concentration: 250–500 ppm (parts per million) is ideal Dissolve in distilled water — a tiny amount goes far Example: 100 mg of GA₃ powder in 200 ml of water = 500 ppm Soak seeds for 12–24 hours (no longer) Where to Get It: Available online as powder (search “GA3 plant hormone” or from hydroponic suppliers) Store in fridge, lasts long when dry
STEP 5: Germination (Post-Soak) After any of the above, use your preferred method: Paper Towel Method: Place seeds between damp, non-bleached paper towels Put inside a ziplock bag or Tupperware Keep warm: 70–78°F (21–25°C) — dark, stable environment Check daily for taproot
Tips for Tough Cases: Use kelp extract or fulvic acid in germination water (gentle natural hormones) Low heat mat can boost stubborn seed activity Add a few drops of hydrogen peroxide (0.5%) to discourage rot ☠️ When a Seed is Truly Dead: Crumbles under light pressure Still floats after soaking and scuffing Shows rot or mold even after peroxide rinse
✅ Final Summary Method When to Use Float Test Quick viability check Scarification Thick shells or older seeds GA₃ Soak Old, dormant, or rare genetics Hydrogen Peroxide Disinfecting before germination Paper Towel Safe and visible germination environment
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