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How to Grow Super Lemon Haze Seeds (2025 Grow Diary)

September 29, 2025 / in Genetics Grow Guides / Mesmerise
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Super Lemon Haze is a sativa-dominant classic (80% sativa / 20% indica), bred from Lemon Skunk × Super Silver Haze. With up to 20% THC and ~1% CBD, it delivers a bright, energetic, uplifting high paired with a zesty lemon-tree / sweet citrus aroma. It’s tall (70–90 in), flowers in 9–10 weeks, and yields huge—2.3–2.7 oz/ft² indoors and 25–35 oz/plant outdoors, with harvest around the first half of October.

Here’s exactly how to grow Super Lemon Haze strain step by step.

👉 Shop Super Lemon Haze seeds at Hypno Seeds
🔗 Learn more about Super Lemon Haze strain on Leafly

Setup Checklist for Growing Super Lemon Haze Seeds

🏕️ Indoor Setup

  • Tent: 3×3 ft or larger, height is key
  • Lighting: High-output LED (500–800 W equivalent)
  • Ventilation: Strong inline fan + carbon filter
  • Airflow: Two or more oscillating fans at canopy level
  • Pots: 5–7 gallon fabric pots
  • Medium: Rich soil or coco + perlite
  • Nutrients: Strong veg & bloom program + Cal-Mag
  • Water: pH 6.2–6.6
  • Humidity control: Dehumidifier especially late flower
A labeled diagram of a basic indoor cannabis grow tent setup with full-spectrum LED light, inline fan + carbon filter, clip-on fan, fabric pots, and hygrometer.

🌞 Outdoor Notes

  • Prefers long seasons, warm climates
  • Soil: Deep, organic-rich, well-draining
  • Support: Tall stakes or trellis for colas
  • Protection: Shade early morning, pest netting

Super Lemon Haze Grow Cycle: Quick Conditions Table

Week / StageLight Cycle & IntensityTemp (°F)HumidityNotes
Week 1 – Seedling18–24h, low (~25–30 in away)72–7765–70%Keep soil lightly moist; avoid strong light
Week 2 – Early Veg18/6, ~300 PPFD73–7860–65%Start light veg feed (¼ strength); LST optional
Week 3 – Veg Expansion18/6, ~400–500 PPFD73–7855–60%Stronger feeding; top or SCROG to control height
Week 4 – Pre-Flower Prep18/6, ~500–600 PPFD72–7850–55%Final canopy training; prune lower growth
Week 5 – Flower Transition12/12, ~600–700 PPFD72–7845–50%Pistils form; switch to bloom feed
Week 6 – Bud Sites & Frost12/12, ~700 PPFD70–77~45%Trichomes appear; aroma sharpens
Weeks 7–9 – Bud Fattening12/12, ~700–900 PPFD68–7540–45%Heavy stretch; support tall branches
Week 10 – Ripening & Flush12/12, same intensity65–7035–40%Flush 5–7 days; harvest when trichomes mostly cloudy

Germination: Starting Your Super Lemon Haze Grow

Use the paper towel method:

  1. Place seeds between two damp (not soaked) paper towels.
  2. Sandwich between plates for darkness + airflow.
  3. Keep at ~70–75°F, check daily.
  4. When the taproot hits ~½ inch, transplant root-tip down into medium.

⚠️ Avoid sealed plastic bags or excessive moisture, rot risk is real.

Week 1: Seedling Stage

What to Expect

  • Height: 1–2 in
  • Growth: Cotyledons + first true leaves
  • Color: Bright, fresh green
A visual showing the cannabis seedling stage, from sprouted seed to first set of true leaves.

Environment Targets

  • Light: 18–24h, low intensity
  • Temp: 72–77°F
  • Humidity: 65–70%
  • Water: Light ring around stem
  • Nutrients: None (or light Cal-Mag in coco)

Tip: Gentle airflow helps stems strengthen; avoid direct intense light yet.

Week 2: Early Veg

What to Expect

  • Height: 2–4 in
  • Leaves: More fan leaves, sturdy stems
  • Growth: Compact sativa structure starts unfolding

Environment Targets

  • Light: 18h (~300 PPFD)
  • Temp: 73–78°F
  • Humidity: 60–65%
  • Nutrients: Begin veg feed (¼ strength)

Optional: Start LST to manage height and open canopy.

An illustration showing basic low-stress training (LST) and topping techniques on a young cannabis plant

Week 3: Veg Expansion

What to Expect

  • Height: 6–12 in
  • Branching: More lateral branches develop
  • Canopy: Fills out, leaf area increases

Environment Targets

  • Light: 18h (~400–500 PPFD)
  • Temp: 73–78°F
  • Humidity: 55–60%
  • Nutrients: Veg feed at ½ strength

Additional Info: Super Lemon Haze loves rich feeding and aggressive training; top twice or SCROG for best canopy.

Week 4: Pre-Flower & Final Training

What to Expect

  • Height: 12–20 in
  • Structure: Strong central stem and side branches
  • Aroma: Lemon-citrus notes emerge

Environment Targets

  • Light: 18/6 (~500–600 PPFD)
  • Temp: 72–78°F
  • Humidity: 50–55%
  • Nutrients: Full veg feed

Prep: Finish your training (LST / topping / ScrOG), remove lower shade leaves, get ready for flip.

Week 5: Flower Begins

What to Expect

  • Height: 20–30 in
  • Pistils: Appear at node sites
  • Stretch: Significant upward growth
  • Smell: Bright lemon-tone intensifies

Environment Targets

  • Light: Switch to 12/12 (~600–700 PPFD)
  • Temp: 72–78°F (slight drop at night)
  • Humidity: 45–50%
  • Nutrients: Start bloom feed (higher P & K, lower N)

Week 6: Bud Sites & Trichome Development

What to Expect

  • Height: 30–40 in (could reach 50+ indoors)
  • Buds: Sites fill with pistils and early trichomes
  • Smell: Citrus, fuel, sweet notes combine
A visual showing early cannabis bud development small white pistils, forming calyxes, and early trichome frost

Environment Targets

  • Light: 12/12 (~700 PPFD)
  • Temp: 70–77°F
  • Humidity: ~45%
  • Nutrients: Full bloom + Cal-Mag

Week 7–9: Bud Fattening & Aroma Surge

What to Expect

  • Height: 40–60 in (indoors)
  • Buds: Dense, elongated sativa colas
  • Aroma: Strong lemon, tropical, sweet-sour fuel
  • Trichomes: Heavy frost, full coverage

Environment Targets

  • Light: 12/12, push ~700–900 PPFD
  • Temp: 68–75°F
  • Humidity: 40–45%
  • Nutrients: Maintain bloom; consider terpene boosters

Tip: Strong branch support needed. Uphold airflow to prevent mold.

Week 10: Final Flush & Ripeness Check

What to Expect

  • Buds: Fully mature, heavy and coated
  • Pistils: ~70–90% darkened
  • Trichomes: Mostly cloudy, ~10–20% amber

Environment Targets

  • Light: Maintain 12/12
  • Temp: 65–70°F
  • Humidity: 35–40%
  • Water: Flush with pH’d water for 5–7 days

Harvest: In the first half of October, get trichome balance right.

Harvest & Curing

  • Dry: ~60°F / 55% RH, in darkness, 10–14 days
  • Cure: Glass jars, burp daily first week, then weekly
  • Final result: Vivid citrus-lemon aroma, energetic + uplifting effect

Final Thoughts on Growing Super Lemon Haze Seeds

Super Lemon Haze is a high-energy, aromatic powerhouse—perfect for growers willing to manage height and express terpenes fully. Follow this diary, train aggressively, and cure patiently for top-tier flavor and effects.

If you’ve been searching for how to grow Super Lemon Haze strain, this is your full roadmap.

👉 Shop Super Lemon Haze seeds at Hypno Seeds
👉 Browse more Sativa Seeds
🔗 Learn more about Super Lemon Haze on Leafly

FAQ: Growing Super Lemon Haze Seeds

How long does Super Lemon Haze take to flower?
9–10 weeks, with harvest in early to mid-October outdoors.

How tall does it get?
It can reach 70–90 inches, especially outdoors or in tall indoor spaces.

What yields can I expect?
Indoors: 2.3–2.7 oz/ft². Outdoors: 25–35 oz/plant.

What effects does Super Lemon Haze have?
Creative, energetic, uplifting—full of bright sativa vibes.

What does it taste like?
Zesty lemon tree citrus with sweet undertones and a fuel / sour backdrop.

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