G13 x Haze Regular Seeds – Mr Nice · Legendary Sativa Hybrid

The G13 x Haze regular seeds by Mr Nice are the ultimate old-school Sativa-dominant hybrid, blending the legendary resin production of G13 with the uplifting, cerebral magic of a pure Haze to deliver massive yields and an unforgettable citrus-pine flavor.

Are you feeling a bit lost when it comes to popping regular seeds and managing a vigorous Haze hybrid? It is super common to feel unsure about the right feeding schedule or how to control the stretch, leaving you wondering if you have what it takes to grow these legendary genetics.

When you just wing it, things can go south fast. You might end up overfeeding the Sativa phenotypes, causing nutrient burn, or letting the canopy turn into an unmanageable jungle, which ultimately hurts your yields and leaves you with fluffy, disappointing buds.

But do not stress, because growing G13 x Haze is incredibly rewarding when you follow a clear, phase-based path. By breaking down the process into simple, manageable steps, you will unlock the full potential of this Mr Nice masterpiece, scoring dense, resin-soaked colas without the headache.

Phase 1: Preparing the ground

Before you even think about germinating, you need to set the stage for these regular seeds. Since you will be dealing with both male and female plants, having your space dialed in is crucial to identify sex early and maximize your canopy.

You want to ensure your environment is pristine and your gear is ready to handle a strain that demands a bit of finesse. Here is your pre-flight checklist:

• Clean and sterilize your grow tent to prevent any early pest issues.
• Check your ventilation system; Haze hybrids need excellent airflow.
• Prepare small starter pots with a light, airy substrate.
• Calibrate your pH and EC meters to avoid nutrient lockouts later.
• Set up your hygrometer to maintain that sweet 60-70% humidity for seedlings.

Phase 2: Setting up the product

Now it is time to bring these legendary genetics to life. Germinating and establishing your G13 x Haze plants requires a gentle touch, as you want to build a strong root zone before the vegetative explosion begins.

1. Soak the seeds in a glass of room-temperature water for 12 to 24 hours until they sink.
2. Transfer them to moist paper towels and keep them in a warm, dark spot.
3. Once the taproot is about 1 cm (0.39 in) long, plant them carefully into your starter pots.
4. Keep the light intensity low initially, using a gentle LED or CFL setup.
5. Water sparingly; let the soil dry out slightly between waterings to encourage roots to search for moisture.

Phase 3: Use / growing step by step

This is where the magic happens. As your plants transition from veg to bloom, you will need to manage their growth and keep a close eye on their nutritional needs, especially since Sativa-leaning phenos are sensitive to heavy feeding.

1. Maintain an 18/6 light cycle during veg, keeping temperatures around 22-26 °C.
2. Top or apply Low Stress Training (LST) early to control height and promote an even canopy.
3. Flip the lights to 12/12 to initiate flowering, and watch closely for pre-flowers to separate the males from the females.
4. Gradually introduce bloom nutrients, but keep the EC on the lower side for the Sativa-dominant ladies.
5. Ensure humidity drops to 40-50% during mid-to-late flowering to prevent botrytis in those dense colas.
6. Support the heavy branches with a trellis net or stakes as the buds start packing on weight.
7. Flush the medium with pure water 10 to 14 days before harvest to enhance that sweet citrus and pine flavor.

Phase 4: Closing, maintenance and learnings

Harvesting G13 x Haze is a moment of pure triumph. Once you chop those frosty colas, the drying and curing process is what truly locks in the old-school terpene profile and that potent, balanced high.

Hang the trimmed branches in a dark room with a steady temperature of 18-22 °C and 50-60% humidity. Take your time here; a slow dry over 10 to 14 days is the secret to a smooth smoke. After that, jar them up and burp daily for the first couple of weeks.

Take notes on which phenotypes performed best in your setup. Did the more Afghan-leaning ones take higher nutrients? Did the Haze phenos stretch more than expected? Keeping a grow diary will make your next run with these regular seeds even more epic.

Advantages of following this flow instead of improvising

• Regular genetics: allows you to select the strongest mother plants, which means you can keep your favorite phenotype forever.
• Sativa dominance: provides vigorous lateral branching, meaning you can easily fill a SCROG net for maximum yields.
• G13 lineage: delivers exceptional resin production, which means your buds will be denser and perfect for extractions.
• Phase-based feeding: prevents nutrient lockout, meaning you enjoy a stress-free grow and healthier plants.
• 10-day flush: removes residual salts, which means you get to experience the pure, smooth citrus-pine flavor in every hit.

Technical specifications

• Breeder: Mr Nice Seedbank (Nevil and Shantibaba)
• Type: Regular seeds
• Dominance: Mostly Sativa
• Genetics: G13 (50% Afghan) × Haze (IBL)
• Flowering time (Indoor): 9–11 weeks
• Harvest (Outdoor): November to early December (Northern Hemisphere)
• Yield (Indoor): 500–750 g/m² (1.64–2.46 oz/ft²)
• Yield (Outdoor): High, up to 1 kg/plant (2.20 lb/plant) approx.
• Height (Indoor): 1.00–1.50 m (3.28–4.92 ft) approx.
• Height (Outdoor): 2.00–3.00 m (6.56–9.84 ft) approx.
• Difficulty: Medium / High (sensitive to high EC)
• Structure: Surprisingly compact for a Sativa, dense leaf structure, ideal for SOG & SCROG
• Ideal climate: Temperate, Mediterranean, warm and well-ventilated
• Training: Highly recommended (LST, SCROG, topping)
• Recommended pot: 11–20 L depending on space
• Smell in grow: High (carbon filter recommended)
• THC: ~21%
• CBD: Low
• Aromatic profile: Sweet, citrus fruits, pine, earthy, spicy
• Effect: Strong, uplifting cerebral buzz combined with relaxing body effects

Grow Guide for G13 x Haze

Quick overview:

This regular Sativa-dominant hybrid by Mr Nice requires 9–11 weeks of flowering and moderate skills.

• Ideal for warm, well-ventilated indoor spaces.
• Responds incredibly well to SCROG and LST.
• Keep an eye out for male pre-flowers early.

Safe start:

Germinate seeds at 22–25 °C and transplant carefully once the taproot emerges.

• Maintain high humidity around 60–70%.
• Use Root It 150ml Rooting Gel to speed up rooting.
• Keep initial lighting gentle to avoid stress.

Directed growth:

Run an 18/6 photoperiod and train the canopy early to manage the Sativa stretch.

• Plant in BioBizz Light Mix 50L for optimal aeration.
• Top the main cola to encourage lateral branching.
• Keep EC levels moderate; avoid heavy nitrogen feeding.

Efficient flowering:

Switch to 12/12 and prepare for explosive growth while keeping humidity strictly under 50%.

• Remove males as soon as pollen sacs appear.
• Add Advanced Nutrients Sensi Bloom A+B Pro, Water-Soluble Powder for denser buds.
• Support heavy branches with a sturdy trellis net.
• Flush the substrate thoroughly 10 days before harvest.

Frequently Asked Questions

How much does G13 x Haze stretch during flowering?

Being a Sativa-dominant hybrid, it can double or even triple in size after flipping to 12/12. Using SCROG or topping during the vegetative stage is highly recommended to keep the height manageable indoors.

Are these seeds feminized or regular?

These are regular seeds, meaning they will produce both male and female plants. You will need to identify and remove the males early in the flowering stage to prevent them from pollinating your females.

Why should I keep the EC low for this strain?

The Haze genetics in this cross make certain phenotypes very sensitive to overfeeding. Pushing the EC too high can cause nutrient burn, so it is best to start with a light feeding schedule and increase gradually.

Personal Experience of Pevgrow’s CEO (Alan)

Whenever I pop a pack of G13 x Haze, I know I am in for a treat. I usually run these in a SCROG setup because the Haze vigor is real, and weaving those branches through the net is the best way to maximize the canopy. At first, I made the rookie mistake of feeding them like a heavy Indica, which slightly burned the tips of the more Sativa-leaning phenos. Now, I keep my EC in check and let the genetics do the heavy lifting.

What I love most is the hunt. Finding that perfect mother plant that balances the dense, resinous structure of the G13 with the soaring, spicy-citrus high of the Haze is incredibly rewarding. If you have a bit of patience and respect their feeding limits, this Mr Nice classic will reward you with some of the best old-school stash you have ever smoked.