AUTO MK-Ultra® Kush
Cannabis seeds
by T.H. Seeds
AUTO MK-Ultra Kush Cannabis Seeds
AUTO MK-Ultra Kush is an autoflowering feminised cannabis seed from T.H. Seeds that packs indica-dominant power into a compact, fast-finishing plant. A three-way cross of OG Kush, G-13, and ruderalis genetics, she goes from seed to harvest in roughly 9 weeks — no light schedule changes needed. If you want dense, resinous buds without the fuss of photoperiod growing, this is the strain that delivers.
Pack Sizes
AUTO MK-Ultra Kush seeds come in two pack sizes: 3 seeds and 5 seeds. If you're running a single tent or testing the genetics for the first time, 3 seeds gives you enough to find a good pheno without overcommitting. Go for 5 if you're filling a Sea of Green setup — her compact footprint means you can fit more plants per square metre, and the extra seeds give you a safety margin for any duds.
Why AUTO MK-Ultra Kush Seeds Deserve Your Grow Space
The original MK-Ultra from T.H. Seeds built its reputation on sheer indica potency — a G-13 and OG Kush cross that hits like a freight train. This autoflowering version keeps that same genetic backbone but adds ruderalis to strip away the complexity. No 12/12 light flip, no worrying about light leaks, no waiting 4 months for flower. You germinate, you water, you harvest 9 weeks later. That's it.
We'd pick this over most autoflowers in the same price bracket for one reason: the genetics behind it aren't an afterthought. A lot of autos are bred from middling parents with ruderalis bolted on. AUTO MK-Ultra Kush starts from two of the most respected indica lines in existence — OG Kush and G-13 — and the auto trait is layered on top. You can smell the difference. The buds carry that deep, earthy kush funk with a fuel-like sharpness underneath. They're small — popcorn-sized, honestly — but don't let that fool you. They're rock-hard and caked in trichomes.
The honest limitation: yield. Indoors, you're looking at around 50g per plant. That's modest by any standard. Outdoors she stretches a bit more — up to 1.25m tall and 150g or more per plant — but she'll never compete with a full-size photoperiod on raw weight. What you trade in yield, you gain in speed and simplicity. Two or three harvests per season outdoors, or a perpetual rotation indoors with no separate veg tent. For growers who value turnover over single-plant monsters, the maths works out.
AUTO MK-Ultra Kush Growing Specifications
| Specification | Detail |
|---|---|
| Seed Bank | T.H. Seeds |
| Genetics | OG Kush x G-13 x Ruderalis |
| Type | Autoflowering Feminised |
| Dominant | Indica |
| Seed to Harvest | Approximately 9 weeks |
| Indoor Height | Up to 75cm |
| Outdoor Height | Up to 125cm |
| Indoor Yield | Approximately 50g per plant |
| Outdoor Yield | 150g+ per plant |
| Grow Difficulty | Beginner-friendly |
| Available Packs | 3 seeds / 5 seeds |
How to Grow AUTO MK-Ultra Kush Seeds
- Germinate your AUTO MK-Ultra Kush seeds using the paper towel method or directly in a small pot of moist, airy soil. Taproots typically emerge within 24-72 hours.
- Plant the germinated seed about 1cm deep in its final container. Autoflowers don't transplant well — root disturbance stunts growth, and with only 9 weeks total, you can't afford lost days. Use an 11-15 litre pot for a good balance between root space and manageable watering.
- Keep your light schedule at 18/6 or 20/4 from seedling to harvest. AUTO MK-Ultra Kush doesn't need a 12/12 flip to flower — she'll start on her own around week 3-4. Some growers run 24/0, but we've seen better resin development with a dark period.
- Feed lightly during the first two weeks, then ramp up with a bloom-focused nutrient schedule once you see the first pistils. She's compact and doesn't need heavy feeding — overwatering and overfeeding are the two most common mistakes with small autos.
- Watch for dense bud sites forming along the main cola and side branches. Those tight popcorn nugs can trap moisture, so keep airflow moving through the canopy, especially in the final weeks. A small oscillating fan does the job.
- Harvest when roughly 70-80% of trichomes have turned milky with a few amber heads. With AUTO MK-Ultra Kush's indica dominance, waiting for more amber will push the effect towards heavier sedation. Dry slowly in a dark room at 18-20 degrees Celsius with 55-60% humidity for 7-10 days, then cure in jars for at least two weeks.
AUTO MK-Ultra Kush for Sea of Green Setups
AUTO MK-Ultra Kush is the best autoflower we'd recommend for a Sea of Green (SoG) approach. Her indoor height caps at 75cm, which means you can pack 9-16 plants per square metre under a single light without them fighting for space. Each plant produces one dominant cola with minimal side branching — exactly what SoG demands. No training, no topping, no defoliation debates. Just rows of uniform plants finishing at the same time.
The 9-week seed-to-harvest cycle means you can run multiple rounds in a single season. Stagger your germination by 3 weeks and you've got a perpetual harvest without needing a separate vegetative space. That's a genuine advantage over photoperiod strains, where you'd need two rooms or two tents to achieve the same rotation.
What She Smells and Tastes Like
Crack open a cured jar of AUTO MK-Ultra Kush and the first thing that hits you is fuel. Not subtle — a sharp, acrid petroleum note that sits on top of deep earthy kush. There's a pine undertone in there too, courtesy of the OG Kush parentage, and a faint sweetness that rounds it out on the exhale. The smoke is thick and expansive. She's not a flavour-chaser's strain — this is old-school kush funk, unapologetic and heavy. If you've smoked anything from the OG or G-13 lineage before, you'll recognise the profile immediately.
During the final weeks of flower, expect your grow space to smell. Strongly. A carbon filter isn't optional with this one — those dense little buds pump out terpenes well above their weight class.
Running a SoG with AUTO MK-Ultra Kush? Pair her with a complete grow tent kit that includes extraction and carbon filtration — those kush terpenes will announce themselves to your entire building without it. A basic pH meter and a set of fabric pots round out the setup nicely for autoflower growing.
AUTO MK-Ultra Kush vs Photoperiod MK-Ultra
| Feature | AUTO MK-Ultra Kush | Photoperiod MK-Ultra |
|---|---|---|
| Seed to Harvest | ~9 weeks total | 8-9 weeks flowering + veg time |
| Light Schedule | 18/6 or 20/4 throughout | 18/6 veg, 12/12 flower |
| Indoor Height | Up to 75cm | 80-120cm (depending on veg time) |
| Indoor Yield | ~50g per plant | 350-450g per square metre |
| Grow Difficulty | Beginner-friendly | Intermediate |
| Training Potential | Minimal (LST only) | Full (topping, SCROG, mainlining) |
| Best For | SoG, fast turnover, small spaces | Maximum yield, experienced growers |
The auto version won't match the photoperiod parent on yield — that's the trade-off, and it's worth being upfront about. But if your priority is speed, simplicity, and fitting multiple runs into a year, AUTO MK-Ultra Kush earns her spot. We've seen first-time growers pull a respectable harvest from these seeds with nothing more than a tent, a light, and basic nutrients. The photoperiod version rewards skill and patience with bigger returns, but demands both.
Frequently Asked Questions
Is AUTO MK-Ultra Kush good for beginner growers?
Yes — she's one of the most forgiving autoflowers we carry. The 9-week lifecycle leaves little room for prolonged mistakes, but her no-fuss genetics mean she doesn't punish minor errors in feeding or watering the way some strains do. Start with the basics and she'll do the rest.
How much does AUTO MK-Ultra Kush yield indoors?
Expect around 50g per plant indoors at a height of up to 75cm. It's modest compared to photoperiod strains, but the fast turnaround means you can run multiple cycles per year. In a SoG setup with 9-16 plants per square metre, the total harvest adds up quickly.
Can I top or train AUTO MK-Ultra Kush?
We'd stick to light stress training (LST) only. Topping an autoflower with a 9-week total lifecycle risks stunting her — she doesn't have the recovery time that photoperiod plants do. Gentle bending of the main stem in the first two weeks of growth is the safest way to open up light penetration without losing days.
What does AUTO MK-Ultra Kush smell like?
Fuel-forward with deep earthy kush undertones and a pine edge from the OG Kush genetics. She's pungent — a carbon filter is a must if discretion matters. The smell intensifies significantly in the final 2-3 weeks before harvest.
Does AUTO MK-Ultra Kush need a specific light schedule?
No — that's the beauty of autoflowers. Run her at 18/6 or 20/4 from germination to harvest. She'll begin flowering automatically around week 3-4 regardless of light cycle. No need for a 12/12 switch or a separate veg room.
How tall does AUTO MK-Ultra Kush grow outdoors?
Outdoors she can reach up to 125cm and yield 150g or more per plant. She stays compact enough for balcony grows or discreet garden corners. Plant after the last frost and she'll be ready to harvest roughly 9 weeks later.
What's the difference between the 3-seed and 5-seed packs?
Same genetics, just different quantities. The 3-seed pack suits a single-tent grow or a first run with the strain. The 5-seed pack is better value per seed and gives you more phenos to select from — useful if you're running SoG and want uniform plants.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.