Northern Lights Auto
Fast, Forgiving & Deeply Relaxing
Northern Lights Auto is the autoflowering version of one of the most celebrated indica strains in cannabis history. By crossing the legendary Northern Lights with ruderalis genetics, Crop King Seeds created a compact, fast-finishing plant that flowers automatically regardless of light schedule. Perfect for beginners, balcony growers, and anyone working with limited space, this strain delivers a deeply relaxing body high with sweet, earthy flavours. From seed to harvest in as little as 9–10 weeks total — it doesn't get much easier than this.
18%
1%
7–8 weeks
Medium
60–90 cm
Beginner
Relaxing, Sedating, Body High
Sweet, Earthy, Pine
How to Grow Northern Lights Auto
Everything you need to know to grow Northern Lights Auto successfully — from seed to harvest.
Pro Tips
- Do NOT top or heavily train autoflowers — they have a fixed life cycle and need all their energy for bud production
- Light LST (bending and tying) is fine and can improve yields without stressing the plant
- Run 18–20 hours of light per day from seed to harvest for maximum yield
- Use light, airy soil with good drainage — autoflowers hate waterlogged roots
- Start in the final pot (3–5 gallon) to avoid transplant stress
- Keep feeding light — autoflowers are sensitive to overfeeding
Indoor Growing
- Ideal for 2×2 or 2×4 grow tents — stays compact at 60–90cm
- LED lights work great and keep heat low for small spaces
- Expect 100–200g per plant under good indoor conditions
- Multiple harvests per year possible — 4–5 cycles annually
Outdoor Growing
- Can be grown year-round in warm climates or during summer in Canada
- Perfect for balconies and patios — discreet and compact
- Harvest in as little as 10 weeks from seed outdoors
- Plant in 5-gallon fabric pots for best outdoor results
Grow Timeline
Germination
2–4 days
Paper towel or direct soil method. Autoflowers prefer direct sow to avoid transplant stress.
Seedling
1–2 weeks
Cotyledons and first true leaves appear. Keep humidity at 60–65%.
Vegetative
2–3 weeks
Short veg phase. Apply gentle LST if desired. Pre-flowers appear early.
Flowering
7–8 weeks
Automatic flowering begins. Buds develop rapidly. Maintain 18–20hr light.
Harvest
Day 63–70
Total seed-to-harvest in 9–10 weeks. Check trichomes for readiness.
Common Issues & Fixes
Slow growth or stunting
Check root zone — likely overwatering. Allow soil to dry between waterings.
Nutrient burn on leaf tips
Flush immediately and reduce feeding to 15–20% of recommended dose.
Small yield
Increase light intensity and hours. Ensure 18–20hr light cycle throughout entire life.
Hermaphrodite (pollen sacs)
Remove immediately. Caused by heat stress or light leaks. Improve environment.
Set Up Your Grow with Mars Hydro
Get the LED grow lights, grow tents, and complete kits you need to grow Northern Lights Auto indoors. Trusted by home growers across Canada.
Shop Mars Hydro CanadaNorthern Lights Auto Nutrient Guide
Week-by-week feeding recommendations to maximize yield and potency.
Week 1–2
SeedlingVery light feeding. Autoflowers are sensitive — use 20% of recommended dose.
Week 3–4
Veg / Pre-flowerGentle veg nutrients. Autoflowers transition quickly — watch for early pistils.
Week 5–6
Early FlowerSwitch to bloom formula. Keep nitrogen low to avoid burning.
Week 7–8
Mid FlowerPeak bloom. Add a PK booster if available. Watch for deficiencies.
Week 9
Late Flower / FlushBegin flush. Plain water for final 5–7 days before harvest.
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 Northern Lights Auto?
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