White Widow
The Legend That Started It All
White Widow is one of the most iconic cannabis strains ever created. Born from a cross between a Brazilian sativa landrace and a South Indian indica, this balanced hybrid has been a staple in coffee shops and grow rooms since the early 1990s. Its dense, white-crystal-coated buds deliver a powerful burst of euphoria and energy that breaks through even the most challenging days. White Widow is forgiving for beginners yet rewarding enough for experienced growers — a true all-rounder that thrives in both indoor and outdoor environments.
20%
1%
8–9 weeks
High
80–120 cm
Beginner
Euphoric, Creative, Uplifting
Earthy, Pine, Woody
How to Grow White Widow
Everything you need to know to grow White Widow successfully — from seed to harvest.
Pro Tips
- Thrives in both soil and hydroponic setups — great for first-time growers
- Keep temperatures between 21–26°C during the day for optimal resin production
- Low-stress training (LST) opens up the canopy and dramatically increases yields
- Flush with plain water for the final 2 weeks before harvest to improve flavour
- Harvest when 70–80% of trichomes turn milky white for peak potency
- Humidity should stay below 50% during late flowering to prevent mould on dense buds
Indoor Growing
- Use a 600W HPS or LED equivalent for best results in a 1m² tent
- Switch to 12/12 light cycle after 4–5 weeks of vegetative growth
- SCROG (Screen of Green) works exceptionally well with this strain
- Expect 400–500g/m² under optimal indoor conditions
Outdoor Growing
- Plant after last frost — thrives in warm, Mediterranean-style climates
- Ready for outdoor harvest in late September to early October
- Can reach 150cm+ outdoors — stake plants early to support heavy colas
- Outdoor yields can reach 600g per plant in ideal conditions
Grow Timeline
Germination
2–5 days
Soak seeds 12–24 hrs, then paper towel method until taproot appears.
Seedling
1–2 weeks
First true leaves appear. Keep humidity at 65–70%, light at 18/6.
Vegetative
4–6 weeks
Rapid growth phase. Train, top, or LST during this stage.
Flowering
8–9 weeks
Switch to 12/12. Buds develop and swell with resin.
Harvest
Day 70–80
Check trichomes with a loupe. Milky = peak THC. Amber = more sedative.
Common Issues & Fixes
Nutrient burn (brown leaf tips)
Reduce feeding by 25% and flush with plain water for 2–3 days.
Powdery mildew on buds
Improve airflow, reduce humidity below 50%, apply diluted hydrogen peroxide spray.
Yellowing lower leaves in flower
Normal nitrogen draw-down during flowering. Only act if spreading to upper canopy.
Stretching during early flower
Lower light closer to canopy or reduce light cycle to 11/13 temporarily.
Set Up Your Grow with Mars Hydro
Get the LED grow lights, grow tents, and complete kits you need to grow White Widow indoors. Trusted by home growers across Canada.
Shop Mars Hydro CanadaWhite Widow Nutrient Guide
Week-by-week feeding recommendations to maximize yield and potency.
Week 1–2
SeedlingLight feeding only. Use 25% of recommended nutrient dose. Focus on root development.
Week 3–4
Early VegIncrease nitrogen. Begin Cal-Mag supplementation if using RO water.
Week 5–6
Late VegFull vegetative feeding. Monitor for nitrogen toxicity (dark clawing leaves).
Week 7–8
Early FlowerTransition to bloom nutrients. Reduce nitrogen, boost P and K.
Week 9–11
Mid FlowerPeak bloom feeding. Add bloom boosters. Watch for potassium deficiency.
Week 12–13
Late FlowerTaper nutrients. Begin flush preparation.
Week 14–15
FlushPlain pH-balanced water only (6.0–6.5). Improves taste and smoothness.
Note: NPK values are relative percentages of maximum recommended dose, not absolute measurements. Always follow your specific nutrient brand's guidelines and adjust based on plant response.
Ready to Grow White Widow?
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