MK Ultra Fem

MX Ultra: The Heavy Hitter with Style

Looking to buy MX Ultra seeds in Australia? Strap in—this next-gen hybrid is all about potency, bag appeal, and weight. Built on GSC × OG power with a Mexican backbone, she pumps out sticky resin and that unmistakable fuel-fruit punch. Not just a buzz—a statement.

Quick Stats

MX Ultra is a balanced hybrid (~50/50) testing around 25–29% THC with trace CBD (<1%). Indoors she finishes in 9–10 weeks; outdoors in Australia, expect mid–late April. Yields: ~500–600 g/m² indoors, up to ~700 g/plant outdoors. Matty’s tip: “Bag-appeal queen—frosty, loud, and photogenic.”

The Legend

New-school swagger, old-school bones. The OG and GSC lines load it with raw power; the Mexican influence adds vigour and a citrus-fuel edge. Breeders love her for high THC, dense structure, and elite resin. In grow-offs, she regularly outshines long-time staples.

Flavour & Aroma

On the nose: Petrol first, sweet berry underneath. On the tongue: Citrus-fuel blast on the inhale, earthy berry on the exhale. Sticky and memorable.

Matty’s Take: “Open a jar and the whole room turns. Proper loud.”

Effects & What to Expect

First wave → Fast, euphoric head rush. Then it settles → Deep body ease without full couch-lock. Final vibe → Social-meets-sedate heavyweight—best for evenings or big sessions.

How I Grow It (Matty’s Way)

Skill Level: Intermediate.

Bushy and wide—topping and LST keep her honest. Indoors she shines in SCROG: fill the net and watch the colas frost up. Outdoors, give full sun and airflow; she’ll stack if you’re patient. Late flower humidity is the only real trap—dense buds need moving air.

Matty’s pH Know-How: Soil 6.0–6.5; coco/hydro 5.8–6.2. Keep it steady for maximum resin and flavour.

📅 Grow Log: Inside the Tent

Phase/Week	Key Action/Status	Matty’s Tip
Weeks 1–2 (Seedling)	Steady starter.	Water lightly; let roots hunt. Overwatering = stall.
Weeks 3–4 (Veg)	Bushy, branching.	Top once and spread the arms early; set the net at 20–25 cm.
Weeks 5–6 (Early Flower)	Aroma ramps; first frost.	Carbon filter on—she gets loud fast. Trim lowers for airflow.
Weeks 7–9 (Bulk)	Colas densify and gain weight.	Keep RH <50%. Fan-to-can extraction beats “open a flap.”
Week 10 (Finish)	Mostly cloudy with a touch of amber.	Wait for calyx swell. Patience = extra grams and louder flavour.

🔬 Matty’s Advanced Notes (For the Nerds)

• Terpenes: Limonene • β-Caryophyllene • Myrcene (fuel-citrus with earthy berry).
• VPD: ~1.0–1.2 kPa mid-flower; ~1.0 kPa late to keep resin pumping without foxtails.
• Feeding: Medium-heavy; aim EC ~1.6–2.0 in peak flower. Ease off N from week 4 flower.
• Training: Topping + LST; SCROG indoors. Outdoors, supercrop to control height and stiffen stems. Check my mainlining guide for technique.
• Colour/Resin Tip: She excels under high light. Dropping the night temperature in the final week can boost trichome production and coax out deep colour from her OG/GSC background. Learn how to unlock the violet vibe here.
• Climate: 24–28 °C day / 18–21 °C night; drop to ~22–25 °C late flower for tighter stacks.
• Air Management: LOUD strain—oversize your carbon filter by ~20–30% over fan CFM.
• Red Flag: Clawing in veg = overfeed; glossy canoeing in flower = light too close or VPD too low.

Matty’s Note: “Treat her like a muscle car: steady tune, plenty of air, and she’ll roar.”

🚫 Mythbusting

Myth: “High-THC hybrids are finicky.”
Truth (Matty): MX Ultra is strong and surprisingly forgiving.

Myth: “Fuel strains all taste the same.”
Truth (Matty): This one layers fuel with citrus and berry—proper depth.

Myth: “Balanced hybrids don’t yield.”
Truth (Matty): She’s a chunky producer indoors and out.

🎯 Who It’s For?

Perfect for:

• Growers chasing resin-heavy, high-THC jars.
• Fuel fans who want a fruity twist.
• Intermediate growers ready for chunky yields.

Not ideal for:

• Zero-airflow setups—she demands filtration.
• Ultra-stealth grows—she’s loud.

🏆 Final Verdict

Matty’s Final Word: “MX Ultra is pure modern fire—sticky, strong, and photogenic. If you want top-shelf potency with classic fuel-fruit flavour, this is your new beast.” 💪🔥

Ready to Grow?

Level up your run: Master feeding with our Complete Nutrients Guide, solve issues fast with Leaf Forensics, or browse the full seed range.

MX Ultra FAQs ❓