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How to Grow Lemon Cherry Runtz Seeds (2025 Grow Diary)

August 22, 2025 / in Genetics Grow Guides / Mesmerise

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Lemon Cherry Runtz is a balanced hybrid (50/50) that packs fruity terps with a punchy, euphoric high. With THC up to 22%, she’s not the heaviest hitter in your grow room, but her candy-like flavors and uplifting effects make her a grower favorite. In this week-by-week grow diary, we’ll show you exactly how to grow Lemon Cherry Runtz seeds, from germination to harvest, whether you’re running an indoor tent or letting her thrive under the sun.

Setup & Preparation

Before germination, make sure your grow space is locked and loaded. A solid setup will save you headaches later and let Lemon Cherry Runtz shine with her fruity terps and sticky resin.

🔧 Indoor Setup Checklist

Grow Tent: 3×3 ft or larger (plants reach 50–60″ tall)
Lighting: 300–600W full-spectrum LED
Ventilation: Inline fan + carbon filter for airflow & odor control
Air Circulation: Clip-on fan to strengthen stems and prevent mold
Containers: 3–5 gallon fabric pots
Medium: High-quality soil or coco + perlite mix for drainage
Nutrients: Start light in veg, then bloom boosters (Cal-Mag, PK) for fat buds
pH Range: 6.2–6.5 (soil) | 5.8–6.2 (coco)
Climate: Temp 70–80°F (21–27°C), RH 60–70% seedling → 40–50% 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 Growing Tips

Climate: Warm, sunny spots with low autumn humidity (ready end Sept – early Oct)
Soil: Rich, well-draining with organic compost
Support: Trellis/netting to hold up heavy colas
Stealth Factor: Fruity candy terps make her loud, but her medium height keeps her manageable
Mold Protection: Watch humidity late in flower, use natural pest deterrents (like neem oil)

💡 Pro Tip: Have your lights, airflow, and nutrients set up before you pop the seeds. Lemon Cherry Runtz grows fast, and mistakes in the first weeks can set you back.

Week 1: Germination & Seedling Stage

Light Schedule: 18/6 (LEDs 24–30″ above canopy)
Environment: 72–78°F | RH 65–70%
Watering: Light mist or 50–100 ml every 2–3 days (don’t drown her!)
Nutrients: None yet, just pH’d water

Your Lemon Cherry Runtz seeds should crack within 24–72 hours using the paper towel method (the same one we guarantee at Hypno Seeds). Once a taproot appears, drop them into a moist starter cube or light soil.

By the end of week one, seedlings should show two sets of tiny green leaves reaching for the light. Keep airflow gentle to strengthen stems and avoid damping-off. A humidity dome or plastic cup works well for beginners if the air feels dry.

💡 Pro Tip: Keep light intensity low at first, too much and your seedlings will stretch or burn.

Week 2: Early Vegetative Growth

Light Schedule: 18/6 | LEDs now lowered to 20–24″ above canopy
Environment: 72–78°F | RH 60–65%
Watering: 150–250 ml every 2–3 days | water when the topsoil dries out
Nutrients: Start with a ¼ strength veg nutrient (N-rich formula)

By week 2, your seedlings will be firmly rooted and showing 3–4 leaf sets. Growth will speed up, so keep the light strong but not scorching.

A visual showing the cannabis seedling stage, from sprouted seed to first set of true leaves.

This is the perfect time to begin gentle LST (Low Stress Training). Softly bend the main stem to the side and secure it with plant ties. This allows light to reach the lower nodes, preparing your Lemon Cherry Runtz for bushy, even growth.

💡 Pro Tip: Don’t rush topping yet. Focus on healthy root development and controlled stretch before heavy training.

Week 3: Veg Expansion & Training

Light Schedule: 18/6 | LEDs at 18–20″ above canopy
Environment: 72–78°F | RH lowered slightly to 55–60%
Watering: 300–400 ml every 2–3 days | adjust as roots spread
Nutrients: Increase to ½ strength veg nutrients (Nitrogen-heavy)

By week 3, your Lemon Cherry Runtz plants will have a strong root system and plenty of new growth. This is the prime moment for topping. Snip above the 4th or 5th node to create multiple colas instead of one dominant main stem.

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

Pair this with Low Stress Training (LST) by tying down branches outward. This technique exposes more bud sites to light and encourages bushier, high-yield growth.

👉 For a detailed step-by-step on LST, check out our full guide: How to Do Low Stress Training (LST): Tie Down Method Step by Step

Your plants should now look wide and balanced, setting the stage for an explosive veg phase.

Week 4: Strong Veg & Pre-Flower Prep

Light Schedule: 18/6 | keep intensity high, canopy 16–18″ from lights
Environment: 72–78°F | RH ~50–55% to reduce mold risks
Watering: 400–500 ml every 2–3 days (watch run-off for salt buildup)
Nutrients: Move to ¾ strength veg feed | supplement with Cal-Mag if leaves show pale spots

By week 4, Lemon Cherry Runtz is usually filling out with thick lateral growth thanks to topping + LST. Keep gently tying branches outward and down to open up the canopy.

This week is all about preparing for flower:

Defoliate lightly by removing a few large fan leaves blocking bud sites.
Double-check trellis/net setup if you’re planning to scrog.
Train the shape so airflow can move freely under the canopy.

You’re setting up the architecture for a dense, chunky flower stage. Keep her stress low and nutrients steady.

Week 5: Transition Into Flower

Light Schedule: Flip to 12/12 to trigger flowering
Environment: 70–77°F | RH down to 45–50% to avoid humidity issues
Watering: 500–600 ml every 2–3 days | monitor pH ~6.2–6.5
Nutrients: Switch to bloom base nutrients (low N, higher P & K)

Your Lemon Cherry Runtz is now officially in pre-flower mode. Expect to see white pistils forming at the nodes within days. This is when she shifts from building leaves to stacking buds.

Training tips this week:

Stop topping now; only continue LST if branches need adjustment.
Remove lower weak shoots (“lollipopping”) to direct energy to top bud sites.
Check for early signs of sexing (all feminized here, but pistil formation is a good sign of health).

From here on, it’s all about building big colas while keeping her stress-free and airflow strong.

Week 6: Early Flower Development

Light Schedule: 12/12 stays consistent
Environment: 68–77°F | RH ~40–45%
Watering: ~600–700 ml every 2–3 days | pH 6.2–6.5
Nutrients: Bloom base + extra phosphorus & potassium for flower sites

By now, your Lemon Cherry Runtz is showing her first tiny budlets, clusters of white pistils popping up along each branch. This is the stage where her sweet berry–lemon aroma begins to tease the grow space.

A visual showing early cannabis bud development small white pistils, forming calyxes, and early trichome frost

Pro grower moves this week:

Keep defoliating lightly (remove large fan leaves blocking bud sites).
Adjust LST ties so branches stay open and light penetrates evenly.
Watch humidity closely—early flowers are sensitive to mold.

Your plant is now fully committed to flowering. Every decision you make here, airflow, light spread, and nutrition, sets the stage for dense, frosty colas later on.

Week 7: Mid-Flower Explosion

Light Schedule: 12/12 still locked in
Environment: 68–75°F | RH 40%
Watering: ~700–800 ml every 2–3 days | pH 6.2–6.5
Nutrients: Bloom mix + PK booster | Cut nitrogen to minimum

This is the stacking phase. Your Lemon Cherry Runtz is bulking up! Buds are noticeably denser, calyxes are swelling, and frosty trichomes begin dusting the sugar leaves. The sweet berry–citrus scent now fills the tent like candy air freshener.

Pro grower tips this week:

Keep defoliation minimal now, just enough for airflow.
Consider adding a support net (SCROG or trellis) to prevent branch flop later.
Keep airflow strong—buds are fattening and humidity control is key.

By the end of week 7, your plant should look like a mini Christmas tree of sparkling nuggets, setting up perfectly for the resin explosion in the coming weeks. 🌲✨

Week 8: Frost & Aroma Takeover

Light Schedule: 12/12 locked in
Environment: 67–74°F | RH 35–40%
Watering: ~600–700 ml every 2–3 days | pH 6.3–6.5
Nutrients: Bloom mix | PK booster at full dose | Flush start prep soon

Your Lemon Cherry Runtz is frosting up like a powdered donut this week. Trichomes explode across the buds and sugar leaves, making them look dipped in sugar. The terp profile sharpens, sweet lemon, cherries, and candy-like creaminess now dominate the grow room.

Pro grower moves:

Start checking trichomes with a jeweler’s loupe 🔍 (most still clear now).
Begin reducing nitrogen to zero.
Keep humidity tight, mold risk spikes when buds are this thick.
If you’re running CO₂, this is the last big push for it to make a difference.

By the end of this week, buds are chunky, sticky, and loud, your grow tent smells like a candy shop gone wild.

Week 9: The Final Push

Light Schedule: 12/12 unchanged
Environment: 65–72°F | RH 30–35%
Watering: Plain water or very light flush | pH 6.3–6.5
Nutrients: Stop feeding | only water to push out excess salts

Your Lemon Cherry Runtz is at peak beauty this week. Buds are swollen, trichomes are milky with a touch of amber, and the aroma is overwhelming: sweet, citrusy, and candy-like. This is when patience pays off.

Pro grower moves:

Start a full flush if you haven’t already. Clean water only.
Watch trichomes daily: harvest when you hit your preferred ratio of milky vs amber.
Keep temps stable at night to preserve colors and terpenes.
Don’t rush—1–2 extra days can mean peak flavor and potency.

By the end of this week, your grow room is a wall of frosty candy buds, sticky and ripe for harvest. 🌟

Harvest & Curing

Congratulations! You’ve reached harvest! Your Lemon Cherry Runtz is packed with sweet berry-citrus aromas and frosty resin, ready to deliver those euphoric, uplifting effects.

✂️ Harvesting

Cut branches in the early morning (lights off) for maximum terpene retention.
Trim fan leaves immediately, then decide if you’ll do a wet trim (fast, less terp loss) or dry trim (slower, more flavor preserved).

🌬️ Drying

Hang branches or lay buds on racks in a dark room.
Keep at 60–65°F with 50–55% RH.
Dry for 7–10 days, until stems snap instead of bend.

🫙 Curing

Place dried buds in glass jars, filled 70–75% full.
Store in a cool, dark space at 60–65°F.
Burp jars (open for 10–15 minutes) daily for the first 2 weeks, then less often.
Cure for at least 3–4 weeks for peak flavor, smoothness, and potency.

The result? Sticky, candy-like buds with the perfect blend of lemon, cherry, and sweet Runtz magic.

Final Thoughts 🌟

Growing Lemon Cherry Runtz seeds is a rewarding ride for any grower who loves candy-like flavors and balanced effects. From germination to curing, this strain shows off resilience, fast flowering, and sticky buds bursting with sweet berry-citrus terps. Whether you’re aiming for indoor control or letting her shine outdoors, following a step-by-step approach ensures a smooth grow and top-shelf harvest.

👉 Ready to start your own run? Shop Lemon Cherry Runtz seeds here and bring this fruity powerhouse to your grow.

For more background on this strain’s genetics and reviews from the community, check out the Lemon Cherry Runtz page on Leafly.