Auto Ultimate is Dutch Passion’s autoflowering version of The Ultimate, one of its best-known high-yield strains. Crossed with Auto Mazar to add autoflower timing and hardiness, it is a balanced 50/50 hybrid that delivers big indoor yields and a clear-headed, relaxing effect. It runs a slightly longer 11-14 week cycle than most autos, and that extra time is what lets it pack on weight.
This is an autoflower, so it flowers on age rather than a change in the light cycle, which keeps the grow simple. Note that The Ultimate is also sold as a photoperiod strain; this guide is about the autoflower. The figures below are Dutch Passion breeder values, so check your own pack for the exact numbers.
Recommended Strains
Auto Ultimate
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THC | 15% - 20% (Medium) |
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Lineage | The Ultimate X Auto Mazar |
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Type | Autoflowering |
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Height | 3.28 ft | 1 m |
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Yield | High |
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Yield Indoor | 1.64 oz/ft² | 500 g/m² |
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Yield Outdoor | 3.53 oz/plant | 100 g/plant |
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Life Cycle | 11 - 14 weeks |
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Phenotype | 50% Indica / 50% Sativa |
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Effects | Focused, Relaxed |
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Flavors | Sweet, Pepper |
Auto Colorado Cookies
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THC | 15% - 20% (Medium) |
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Lineage | Auto Blueberry X Girl Scout Cookie |
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Type | Autoflowering |
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Height | 3.94 ft | 1.2 m |
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Yield | Medium |
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Yield Indoor | 1.47 oz/ft² | 450 g/m² |
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Yield Outdoor | 3.53 oz/plant | 100 g/plant |
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Life Cycle | 11 weeks |
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Phenotype | 80% Indica / 20% Sativa |
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Effects | Powerful, Relaxed |
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Flavors | Tropical, Mango |
Auto Ultimate Grow Info
| Trait | Auto Ultimate (Dutch Passion) |
| Genetics | The Ultimate x Auto Mazar |
| Seed type | Autoflowering |
| Genetic profile | 50% indica / 50% sativa (balanced) |
| THC | 15-20% (medium) |
| Full life cycle | 11-14 weeks from germination |
| Height | Around 1 m, but stretches taller via its Auto Mazar side |
| Indoor yield | High, up to 500 g/m² |
| Outdoor yield | Around 100 g per plant |
| Effects | Focused, uplifting, relaxed |
| Flavor | Sweet, peppery |
These are Dutch Passion’s published figures for the Auto Ultimate line at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own Auto Ultimate seed pack.
What Makes Auto Ultimate Worth Growing
The headline here is yield. Auto Ultimate inherits The Ultimate’s productivity, and at up to 500 g/m² indoors it is one of the heavier autoflowers you can run. The Auto Mazar side adds hardiness and the autoflower timing, so you get that big yield on a plant that flowers on its own and forgives mistakes.
The effect is genuinely balanced, as you would expect from a 50/50 hybrid: an uplifting, focused mental lift paired with a calming body relaxation, good for winding down while keeping a clear head. The flavor is sweet with a peppery edge, backed by pinene and myrcene for a profile that reads fresh and herbal rather than heavy.
Is Auto Ultimate Indica or Sativa?
Auto Ultimate is a balanced hybrid, listed at 50% indica and 50% sativa, with ruderalis in the mix for its autoflower timing. Neither side dominates.
That even split shows in the experience. The sativa half gives a clear, focused, uplifting start, while the indica half brings a relaxing body note, so the high works at different times of day. In the garden, it means a vigorous plant that can stretch like a sativa yet keeps the hardiness of its indica Mazar parent.
Flowering Time vs Full Grow Time
Autoflowers confuse a lot of growers on timing, so it is worth being precise.
- Full grow time (seed to harvest): about 11-14 weeks. This is the figure Dutch Passion publishes, and it covers the whole cycle from germination to a ready plant.
- Flowering stage: this happens inside that 11-14 week window, not after a separate long veg period. Dutch Passion lists the complete lifecycle rather than a separate flowering-day count, so the safest planning number is the full cycle.
The takeaway: do not treat 11-14 weeks as flowering and then add veg on top. Auto Ultimate runs a little longer than the average autoflower, and that extra time is part of why it yields so well, so plan for the full window rather than a fast finish.
Does Auto Ultimate Need a 12/12 Light Cycle?
No. Auto Ultimate flowers on age, not day length, so it never needs a 12/12 photoperiod to bloom.
Indoors you can hold a longer schedule like 18/6 or 20/4 from seedling to harvest. Dropping to 12/12 once flowering starts only cuts daily light and costs you yield, which matters even more on a heavy producer like this. Keep the longer schedule and strong light intensity instead.
Auto Ultimate Grow Timeline, Week by Week
Treat this as a development pattern, not a fixed schedule, since phenotype and environment shift the dates, and this strain runs a little longer than most autos.
- Weeks 1-2: germination and seedling. The taproot and first leaves establish. Keep water light and conditions stable.
- Weeks 3-5: vegetative growth. The plant builds frame fast and can stretch. Start low stress training early while stems are soft.
- Weeks 5-7: stretch and bud set. Vertical growth is strong here thanks to the Auto Mazar side, so manage the height. Flower sites fill in and water demand rises.
- Weeks 8-11: main flower development. Buds thicken and the big yield takes shape. Keep conditions stable.
- Weeks 12-14: maturation and harvest. Most plants finish here. Judge ripeness by the trichomes, not the day count.
Choosing Your Setup: Space, Light and Pots
Give this one room. The profile lists about 1 m, but Auto Ultimate stretches taller than many autos through its Auto Mazar heritage, so leave vertical headroom and start training early. A 2×4 ft tent suits a couple of plants with space for the stretch.
Light drives the big yield, so do not skimp. A full-spectrum LED at 30-40 watts per square foot, starting 12-18 inches above the canopy, supports the heavy flowers. Pair it with good exhaust to handle a larger, productive plant.
Plant straight into the final 5 gallon fabric pot and skip transplanting, which autos dislike. The bigger pot gives the roots room to support the yield, and fabric pots air-prune for a healthier root zone.
Germinating and Raising Seedlings
The paper towel method is the easy, reliable start. Soak the seeds for 12-24 hours, then set them between damp paper towels on a covered plate, kept dark and warm at 70-85°F (21-29°C). A taproot usually shows in two to three days.
When the taproot reaches about 1-2 cm, plant it root-down a knuckle deep in a light mix and keep the surface moist until the seedling breaks ground. Hold off on nutrients at this stage. New to germination? Our beginner growing guides walk through it step by step.
The Vegetative Stage and Low Stress Training
Veg is short on an auto, so use these weeks to build a wide, even frame and control the stretch. Keep nitrogen available, hold temperatures in the low to mid 70s°F, and start training early.
Because Auto Ultimate stretches, low stress training pays off twice: it keeps the height in check and opens the canopy so light reaches the lower buds, which lifts an already-high yield. Tie the main branches outward gently. Skip topping and other high-stress cuts, since an autoflower has no time to recover before the clock flips it into flower.
Feeding and Watering Auto Ultimate
Feed to match the yield, but build up gradually. A heavy producer can take a fuller bloom schedule than a small auto, yet the compact auto root system still burns if you rush it. Start nutrients at about half the label strength, use a nitrogen-forward base through veg, then move to a bloom formula higher in phosphorus and potassium as flowering sets in, reading the leaves as you go.
Water by root-zone moisture, not a timetable. A young plant needs very little, and soaking the whole medium starves the roots of oxygen. As the plant grows large and productive, demand climbs quickly, so increase water gradually by pot weight and how fast the top layer dries.
Flowering and Knowing When to Harvest
Flowering begins on its own around week five, later than some autos, with a strong stretch before the buds set. The sweet, peppery aroma builds through the middle weeks, so keep air moving and run a carbon filter indoors.
As the 11-14 week finish approaches, let the plant decide. Check trichomes under a loupe and harvest when most are cloudy with a few turning amber. After the cut, hang the branches in the dark at about 60°F (15-16°C) and 55-60% humidity for 7-14 days, then cure in jars, burping daily for the first weeks. Drying and curing come after harvest and are not part of the seed-to-harvest count.
Growing Indoors vs Outdoors
Indoors is where Auto Ultimate earns its name. Hold 18/6 the whole way, manage the stretch with training, and the high 500 g/m² yield is very reachable under strong light.
Outdoors, the autoflower trait lets you plant after the last frost and harvest in about three months, and the Auto Mazar hardiness helps it handle fluctuating conditions. Outdoor yields are more modest at around 100 g per plant, so like many autos it rewards indoor growing more. Give outdoor plants full sun, well-draining soil, and a warm spot.
How Tall and How Much? Height and Yield
Height is the planning point. The profile lists about 1 m, but Auto Ultimate stretches taller than most autos through its Auto Mazar side, so leave extra vertical room and train early to keep it in bounds indoors.
On yield, this is a high producer for an autoflower: up to 500 g/m² indoors under strong light, and around 100 g per plant outdoors. The longer 11-14 week cycle and an open, trained canopy are what let it hit the top of that indoor range.
Best US Climates for Auto Ultimate
Auto Ultimate suits warm, sunny climates best outdoors, where its longer cycle has time to finish and fill out. Growers in California and the warm West get the strongest outdoor results.
The autoflower timing still helps growers in the northern states and Pacific Northwest, but the longer 11-14 week window means you want to plant early enough to beat the fall rains. In the humid Southeast, keep airflow up around the big canopy. Indoors, it performs well anywhere with enough vertical room, which is where it yields best. For other varieties, browse our full how-to-grow library.
Common Problems When Growing Auto Ultimate
A few predictable issues are easy to avoid.
Underestimating the stretch and cycle
Auto Ultimate runs longer and taller than the average autoflower. Growers who set up for a short, fast auto run out of time or vertical room. Plan for the full 11-14 weeks and leave headroom.
Expecting big outdoor yields
Outdoor returns are modest at around 100 g per plant. The high yield is an indoor figure, so lean on indoor light if weight is the goal.
Overfeeding early
A heavy yielder still has a small auto root system at the start. Build the feed up gradually from half strength rather than pushing nutrients early, and read the leaves.
Harvesting by the calendar
The 11-14 week window is a reference, not a cutting date. Read the trichomes and flower maturity before you cut, since phenotype and environment shift the finish.
Making the Most of Your Harvest
Do not waste the trim. The resinous sugar leaves make good bubble hash, dry sift, or infused oil, and a big yielder leaves plenty of quality trim. The stems, roots, and fan leaves compost well and feed your next grow.
Is Auto Ultimate Right for You?
If you want one of the heavier-yielding autoflowers with a balanced, clear-headed effect, yes, as long as you can give it a little extra time and vertical space. It is hardy and forgiving thanks to its Auto Mazar side, and it rewards strong indoor light with a big harvest. For more on that hardy parent, see our Mazar Auto grow guide.
Frequently Asked Questions
Is Auto Ultimate indica or sativa?
Auto Ultimate is a balanced hybrid, listed at 50% indica and 50% sativa, with ruderalis for its autoflower timing. The even split gives a clear, uplifting, focused effect from the sativa side and a calming body relaxation from the indica side, so it works at different times of day rather than only at night.
Does Auto Ultimate need a 12/12 light cycle?
No. Auto Ultimate flowers automatically with age, not day length, so it never needs a 12/12 schedule. Indoors you can hold a longer photoperiod like 18/6 or 20/4 from seedling to harvest. Reducing the light once flowering starts only lowers your daily light and costs yield on a heavy producer.
How long does Auto Ultimate take from seed to harvest?
Auto Ultimate finishes in about 11 to 14 weeks from germination, a little longer than most autoflowers. That figure covers the whole seed-to-harvest cycle, not just flowering, and the extra time is part of why it yields so well. Judge the finish by trichome maturity rather than the day count.
How much does Auto Ultimate yield?
Auto Ultimate is a high yielder for an autoflower, at up to 500 g/m2 indoors under strong light, and around 100 g per plant outdoors. It performs best indoors. The longer cycle, strong light, and an open trained canopy are what move the indoor figure toward the top of its range.
How tall does Auto Ultimate grow?
The profile lists about 1 m, but Auto Ultimate stretches taller than most autoflowers through its Auto Mazar heritage, often toward a meter and a quarter. Plan for extra vertical room, start low stress training early, and expect most of the height to come during the stretch in the middle weeks.
How strong is Auto Ultimate?
Auto Ultimate tests at a medium 15 to 20% THC, lower than the strongest modern hybrids. The balanced effect is clear-headed and relaxing rather than overwhelming, which makes it an approachable choice for less experienced users and for times when you want a functional, even high alongside the big yield.
Can you clone Auto Ultimate?
Not usefully. As an autoflower, a cutting keeps the mother’s age, so it tries to flower straight away as a tiny plant and yields almost nothing. If you want more plants, germinate more seeds. Cloning only makes sense with photoperiod strains, such as the photoperiod version of The Ultimate.
