MK-Ultra Cake Regular Seeds by TH Seeds – Limited Edition Indica Hybrid with High Yield & Potent Effects

MK-Ultra Cake by TH Seeds is a limited-edition regular seed that delivers a premium hybrid experience, blending euphoric mental clarity with deep physical relaxation and exceptional resin production.

Struggling to find a strain that balances power and finesse?

You’ve tried the trendy genetics, but many fall short—either too cerebral, too sedating, or just not potent enough. You're looking for something that hits hard but smooth, with rich flavor and serious yield potential.

Feeling stuck between old-school classics and modern terpene monsters?

Most legacy strains lack the aromatic complexity today’s connoisseurs crave, while new cultivars often sacrifice strength for scent. It’s frustrating when you want both knockout potency and gourmet taste in one plant.

MK-Ultra Cake is the elite hybrid that bridges generations

This rare release from TH Seeds unites the award-winning MK-Ultra with the terpene-rich Birthday Cake, creating a fast-flowering powerhouse that produces up to 450 g/m² of dense, trichome-glazed buds. With an 8–9 week flowering cycle and a manageable height of 0.90–1.30 m (2.95–4.27 ft), it’s built for discretion and efficiency. The flavor fuses sweet vanilla and birthday cake with spicy, earthy undertones, while the high starts uplifting and melts into full-body calm—perfect for unwinding without losing touch.

What makes MK-Ultra Cake a cut above?

• Combines legendary MK-Ultra genetics with modern terpene profiling for unmatched depth
• Produces 350–450 g/m² (10.4–13.4 oz/ft²) of dense, resin-heavy flowers indoors
• Flowers in just 8–9 weeks, ideal for quick turnover and multiple harvests
• Thrives in both indoor and outdoor setups, ready for harvest by October in the Northern Hemisphere
• Regular seeds allow for breeding projects and phenotype hunting

Technical specifications

• Breeder / Brand: TH Seeds
• Type: Regular
• Dominance: Indica / Sativa hybrid
• Genetics: Birthday Cake × MK-Ultra
• Flowering time: 8–9 weeks
• Outdoor harvest: October (Northern Hemisphere)
• Indoor yield: 350–450 g/m² (10.4–13.4 oz/ft²)
• Height: 0.90–1.30 m (2.95–4.27 ft)
• Difficulty: Medium
• Structure and vigour: Compact branching, strong lateral development
• Ideal climate: Temperate, Mediterranean
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST and SCROG; avoid aggressive pruning
• Recommended pot: 11–20 L depending on space
• Light: 18/6 in vegetative stage, 12/12 in flowering
• Temperature: 22–26 °C in veg, 20–25 °C in flower
• Humidity: 50–60% in veg, 40–50% in flower
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• THC: High (approx.)
• Aromatic profile: Myrcene, Caryophyllene, Limonene
• Flavour: Sweet, spicy, floral, earthy
• Effect: Euphoric, relaxing, tingly—ideal for evening use

How to grow MK-Ultra Cake for maximum results

Get the most out of this limited-edition strain with a tailored approach that honors its hybrid vigor and resin potential.

Quick overview of the cycle

Regular seed with an 8–9 week flowering time, ideal for indoor or outdoor grows in temperate climates.

• Start with high-quality germination medium for strong taproot development
• Use a well-aerated soil or coco mix to support vigorous growth
• Ensure stable climate: 22–26 °C and 50–60% RH during veg
• Switch to 12/12 light cycle to initiate flowering
• Harvest when trichomes turn milky to amber for balanced effects

Safe start

Launch your grow with confidence by focusing on root health and early stability.

• Germinate seeds in a moist paper towel or starter cube at 22–25 °C
• Transplant carefully once the radicle reaches ~1 cm (0.4 in)
• Use a light feeding schedule to avoid nutrient burn
• Consider Clonex Rooting Hormone Gel to boost early root development
• Keep humidity high (60–70%) during the seedling stage

Directed growth

Shape your plants for optimal light exposure and yield.

• Apply low-stress training (LST) early to open up the canopy
• Use B'CUZZ ROOT STIMULATOR to enhance root mass and nutrient uptake
• Water when the top inch of soil feels dry
• Avoid topping or FIM due to regular seed variability
• Monitor pH regularly to prevent deficiencies

Efficient flowering

Maximize resin and bud density during the critical flowering phase.

• Reduce humidity to 40–50% to prevent mold
• Ensure strong airflow with oscillating fans
• Introduce bloom boosters like PK 13/14 during weeks 3–5 of flower
• Stop nutrients and flush with plain water 7–10 days before harvest
• Inspect trichomes weekly as harvest approaches

Harvest, drying and curing

Preserve potency, flavor, and smoothness with proper post-harvest care.

• Cut branches when 70% of trichomes are milky, 30% amber
• Dry buds slowly at 18–22 °C and 50–60% RH for 7–10 days
• Trim carefully to maintain trichome integrity
• Cure in glass jars, burping daily for 2–4 weeks
• Store in a cool, dark place to preserve terpenes

Frequently Asked Questions

Is MK-Ultra Cake suitable for beginner growers?

It's medium difficulty—best for growers with some experience due to its regular seed nature and need for environmental control. However, its resilience and fast cycle make it manageable with proper preparation.

Can I grow MK-Ultra Cake outdoors in a colder climate?

Yes, but it thrives best in temperate to Mediterranean climates. If growing in cooler zones, start early and use a greenhouse for protection against early rain or frost.

What’s the difference between regular and feminized seeds?

Regular seeds produce both male and female plants, allowing for breeding and genetic exploration. Feminized seeds are guaranteed female, ideal for straightforward harvests.

How can I maximize yield with MK-Ultra Cake?

Use SCROG or LST to spread the canopy, maintain optimal climate, and feed with bloom enhancers during mid-flower. Avoid overwatering and nutrient lockout by monitoring pH.

Why is this a limited edition?

TH Seeds released only 65 boxes of this regular seed version, making it a rare collector’s item and breeding opportunity for serious cultivators.

Personal Experience of Pevgrow’s CEO (Alan)

I first got my hands on MK-Ultra Cake at a breeder’s event in Amsterdam—only 65 boxes were made, and I grabbed one. I knew it was special: TH Seeds doesn’t do hype, they do legacy. I grew it alongside some modern phenotypes, and it outshined them in resin production and depth of effect. The high starts with a cerebral spark—creative, slightly euphoric—then gently pulls you into deep relaxation. No anxiety, no paranoia, just pure chill. For beginners, I’d say: this isn’t your first grow, but if you’re ready to level up, it’s a masterclass in balance. For experts? It’s a goldmine for pheno hunting and breeding. I’ve kept seeds from my favorite female, and I’m crossing it with a high-CBD line next season. Pro tip: go easy on the nutrients—this one hates overfeeding. And don’t skip the flush; clean taste makes all the difference.