Moby Dick by Green House Seeds is a legendary high-yielder, named for its whale-sized harvests. A cross of Haze x White Widow, it is a feminized photoperiod plant with a citrus, pine, herbal, and vanilla flavor and a balanced effect that blends cerebral focus with body relaxation. At a smooth 17-18% THC, it is approachable, and its real claim to fame is enormous production, up to 1200 g per plant outdoors, on a surprisingly quick flower. 

This is a feminized photoperiod strain, not an autoflower, so it flowers when you shorten the light cycle and gives you full control over veg length, training, and cloning. A separate Moby Dick Auto exists; this is the photoperiod. The figures below are Green House breeder values; check your own pack for the exact numbers. 

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A dense, green Original Moby Dick Auto cannabis plant with crystalline trichomes and pointed leaves grows upward. In the bottom left corner, the text "Moby Dick auto" is superimposed with a whale logo.

Moby Dick Auto

THC THC 23% - 24% (High)
Lineage Lineage Moby Dick x Ruderalis
Type Type Autoflowering
Height Height 3.28 ft | 1 m
Yield Yield High
Yield Indoor Yield Indoor 1.31 - 2.13 oz/ft² | 400 - 650 g/m²
Life Cycle Life Cycle 10 weeks
Phenotype Phenotype 30% Indica / 70% Sativa
Effects Effects Giggly, Creative, Energetic, Relaxed
Flavors Flavors Lemon, Pine, Woody
A dense, frosty Moby Dick Strain cannabis bud with small leaves, set against a dark background. A female symbol is at the top left, and faint "Green House" text is in the background.

Moby Dick Seeds

THC THC 17% - 18% (Medium)
Lineage Lineage Haze x White Widow.
Type Type Feminized
Height Height 7.22 ft | 2.2 m
Yield Outdoor Yield Outdoor 42.33 oz/plant | 1200 g/plant
Flowering Time Flowering Time 8 - 9 weeks
Phenotype Phenotype 60% Indica / 40% Sativa
Effects Effects Relaxed, Focused
Flavors Flavors Citrus, Spicy, Herbal, Pine, Vanilla

Moby Dick Grow Info 

Trait Moby Dick (Green House) 
Genetics Haze x White Widow 
Seed type Feminized photoperiod 
Genetic profile 60% indica / 40% sativa 
THC 17-18% (medium) 
Flowering time 8-9 weeks 
Height Around 2.2 m 
Indoor yield Not published; high (see note) 
Outdoor yield Very high, around 1200 g per plant 
Effects Relaxed, focused, cerebral 
Flavor Citrus, pine, herbal, spicy, vanilla 

These are Green House’s published figures for the Moby Dick line at Growlantis. The profile does not list an indoor yield; it is famously high. Check the specification on your own Moby Dick seed pack for exact numbers. 

What Makes Moby Dick Worth Growing 

Moby Dick is one of the most famous high-yield strains in the world, and for good reason. Its Haze and White Widow heritage produces a vigorous, towering plant that delivers massive harvests, up to a huge 1200 g per plant outdoors, while finishing in a reasonable 8-9 weeks. For growers chasing big weight, few photoperiods match it. 

The quality holds up too. The flavor is a bright blend of citrus, pine, herbal, and vanilla notes, and the effect is balanced, cerebral focus and euphoria from the Haze side, body relaxation from White Widow, at an approachable 17-18% THC. It is also listed as suitable for novices and seasoned growers, so its main demand is simply space for its size. 

Is Moby Dick Indica or Sativa? 

Moby Dick is listed as a 60% indica / 40% sativa hybrid, though its Haze and White Widow heritage gives it a strong cerebral, uplifting character alongside the relaxation. 

That shows in a balanced effect: a focused, euphoric, cerebral lift combined with a relaxing body presence. The plant grows tall and vigorous like its Haze side, so while the profile leans slightly indica, expect to manage it as a big, stretchy, productive hybrid. 

Flowering Time vs Full Grow Time 

Because Moby Dick is a photoperiod strain, these two numbers are separate, and mixing them up is the most common planning mistake. 

  • Flowering time: 8-9 weeks. This is the bloom stage, which starts only when you switch the lights to 12/12 indoors (or when days shorten outdoors). It is quick for such a big, Haze-influenced plant. 
  • Full grow time (seed to harvest): flowering plus however long you veg. Indoors, a typical grow runs around 4 to 5 months from seed, depending on veg length. 

The practical point: because it grows very tall, keep veg shorter indoors to manage height. Outdoors, expect to finish around early to mid October, when it reaches its huge final size. 

Does Moby Dick Need a 12/12 Light Cycle? 

Yes. Moby Dick is a photoperiod strain, so indoors it needs a 12/12 light cycle (12 hours on, 12 hours off) to start and maintain flowering. 

Because it stretches hard, flip to 12/12 earlier than you think, while it is still well short of your height limit, since it keeps growing for weeks into flower. Keep it on 18/6 for veg, then flip to control the final size. Outdoors, shortening late-summer days trigger flowering naturally. 

Moby Dick Grow Timeline, Week by Week 

Treat this as a development pattern, not a fixed schedule, since veg length and the big stretch shape the outcome. 

  • Weeks 1-2: germination and seedling. The taproot and first true leaves establish. Keep humidity up and feeding minimal. 
  • Weeks 3-5: vegetative growth (your choice). The plant builds a large frame fast. Top and train early, and keep veg shorter indoors to control height. 
  • Week 0 of flower: the flip. Switch to 12/12 well before your height limit. Expect a major stretch. 
  • Weeks 1-4 of flower: heavy stretch and bud set. The plant can nearly double. Flower sites form along long branches. 
  • Weeks 5-8 of flower: bud development. Dense, resinous buds build and the citrus-pine-vanilla aroma deepens. 
  • Weeks 8-9 of flower: ripening and harvest. Judge by trichomes, not the calendar. 

Choosing Your Setup: Space, Light and Pots 

Space is the key factor. Moby Dick can hit 2.2 m, so indoors it needs a tall tent or room, an early flip, and firm training. A SCROG net or heavy low stress training helps control the height and spread the huge yield. 

Give it strong light to feed that production. A full-spectrum LED at 35-45 watts per square foot over a large flowering canopy keeps the many buds dense. A strong inline exhaust fan and carbon filter are important for a plant this size. 

For pots, step up to 5-10 gallon containers to support the large root system. Fabric pots improve root airflow and help prevent overwatering. 

Germinating and Raising Seedlings 

The paper towel method is the simple, reliable start. Soak the seeds for 12-24 hours, then place them between damp paper towels on a covered plate, kept dark and warm at 70-85°F (21-29°C). A taproot usually appears within 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 emerges. Hold off on nutrients at this stage. New to growing? Our beginner growing guides cover germination step by step. 

The Vegetative Stage, Topping and Training 

Veg is where you take control of this giant, so train early and firmly. Keep it under 18/6 with a nitrogen-rich feed, and start topping and training while the plant is manageable. Keeping veg shorter indoors helps limit the final size. 

Topping the main stem, ideally more than once, encourages multiple colas and a wider, flatter canopy, which is key to controlling the height. Combine it with a SCROG net or extensive low stress training to spread the growth and expose the many bud sites to light. Finish heavy training before the flip, since the stretch is dramatic. You can also clone a plant you like before flowering to preserve its genetics. 

Feeding and Watering Moby Dick 

Feed to the stage and to the size. A big, hungry plant needs a solid program: a nitrogen-forward base through veg, then a bloom formula higher in phosphorus and potassium once you flip, kept steady through flowering. Start moderate and increase based on how the plant responds, since even a large plant can show nutrient burn. 

Water by root-zone moisture, not a timetable, and expect a big plant to drink a lot. Let the top inch or two of medium dry between waterings, then water thoroughly until a little drains. Large fabric pots and consistent watering keep the extensive root zone healthy. 

Flowering and Knowing When to Harvest 

Once you flip to 12/12, brace for a major stretch, then dense, resinous buds build over the 8-9 week bloom. The citrus, pine, herbal, and vanilla aroma deepens, so strong ventilation and a carbon filter are important indoors. 

Let ripeness, not the calendar, decide the harvest. Check the trichomes under a loupe and cut when most are cloudy, keeping it earlier for the clear, cerebral effect. After harvest, hang the branches in the dark at about 60°F (15-16°C) and 55-60% humidity for 7-14 days, then cure in sealed jars, burping daily for the first couple of weeks to protect the flavor. 

Growing Indoors vs Outdoors 

Indoors, Moby Dick is for tall spaces. With a big tent, early flip, and heavy training, it produces a large, high-quality harvest, though the profile does not publish an exact indoor figure, so plan on a high but space-dependent yield. 

Outdoors is where the legendary numbers come, up to 1200 g per plant, usually finishing around early to mid October. It needs a long, warm season, full sun, rich well-draining soil, and strong support for the heavy colas. Give it room and manage airflow around the dense buds. 

Moby Dick strain dense frosty bud with orange pistils

How Tall and How Much? Height and Yield 

Height is the headline. Moby Dick can reach 2.2 m, so plan your space around it, flip early, and train hard. Outdoors, give it full room; indoors, a SCROG and early flip are essential. 

On yield it is a legend, among the highest-yielding photoperiods, up to 1200 g per plant outdoors. The profile does not list an indoor figure, but expect a large harvest under strong light. Training and strong light are what unlock its full production. 

Best US Climates for Moby Dick 

Moby Dick needs a long, warm season and space to reach its huge size outdoors, so it suits growers in California, the Southwest, and the warm, long-fall South and West who can take it into October with room to grow. 

In cooler or shorter-season states, its tall size is easier to manage indoors, where you control the environment. Its quick 8-9 week flower does help it finish in time in many climates. In the humid Southeast, keep airflow strong around the dense buds. For smaller options, browse our full how-to-grow guide library. 

Common Problems When Growing Moby Dick 

A few predictable issues come with a giant, high-yield plant. 

Running out of height 

The biggest mistake indoors is flipping too late. Switch to 12/12 well before your height limit, since the stretch can nearly double the plant. Keep veg short and train hard. 

Supporting heavy colas 

The huge yield means heavy branches that can snap. Stake or net the plant and support the colas as they fill, especially outdoors. 

Underfeeding a large plant 

A big plant is hungry. Keep a steady feed through flowering and watch for deficiency, adjusting up as the plant demands without tipping into burn. 

Harvesting by the calendar 

The 8-9 week window is a guide, not a cutting date. Read the trichomes and pistils before you cut, since phenotype and environment shift the timing. 

Making the Most of Your Harvest 

With a yield this big, the trim adds up fast. Moby Dick makes good bubble hash, dry sift, or infused oil that keeps the citrus-pine character. The stems, roots, and fan leaves compost well and feed your next grow. 

Is Moby Dick Right for You? 

If you want legendary, whale-sized yields with a bright citrus-pine flavor and a balanced cerebral-relaxing effect, and you have the space, yes. It is a top choice for growers chasing big harvests. If you have a small tent or want a compact, discreet plant, choose a shorter strain instead. Browse our full how-to-grow guide library for alternatives. 

Frequently Asked Questions 

Is Moby Dick indica or sativa? 

Moby Dick is listed as a 60% indica / 40% sativa hybrid, but its Haze and White Widow heritage gives it a strong cerebral, uplifting character alongside relaxation. The effect is balanced: a focused, euphoric lift with a relaxing body presence. The plant grows tall and vigorous like its Haze side, so manage it as a big, stretchy hybrid. 

Does Moby Dick need a 12/12 light cycle? 

Yes. Moby Dick is a photoperiod strain, so indoors it needs a 12/12 light cycle to start and maintain flowering. Because it stretches hard, flip to 12/12 earlier than usual, while it is well short of your height limit. Keep it on 18/6 during veg. Outdoors, shortening late-summer days trigger flowering. 

How long does Moby Dick take to grow? 

Moby Dick flowers in 8 to 9 weeks once you switch to 12/12, quick for such a large, Haze-influenced plant. Total seed-to-harvest time depends on veg length, usually around 4 to 5 months indoors, and keeping veg short helps control height. Outdoors it finishes around early to mid October. 

How much does Moby Dick yield? 

Moby Dick is a legendary yielder, among the highest photoperiods, up to around 1200 g per plant outdoors. The profile does not publish an indoor figure, but expect a large harvest under strong light. An early flip, heavy training, a SCROG, and strong light are what unlock its full, whale-sized production. 

How tall does Moby Dick get? 

Moby Dick can reach around 2.2 m, a true giant, especially outdoors. Indoors you must flip to 12/12 early, keep veg short, and train hard with topping and a SCROG net to keep it in bounds, since it stretches dramatically after the flip. It needs a tall tent or room, or open outdoor space. 

Can you clone Moby Dick? 

Yes. As a photoperiod strain, Moby Dick clones well. Take a cutting from a healthy plant in veg, root it, and keep it under 18/6 light. Cloning lets you preserve a high-yielding plant you like and run repeatable harvests without buying new seeds each time, which autoflowers cannot do. 

How is Moby Dick different from Moby Dick Auto? 

The photoperiod Moby Dick, covered here, needs a 12/12 flip, grows very tall, and can reach legendary outdoor yields of around 1200 g per plant. Moby Dick Auto, from Fast Buds, flowers on its own without a flip, stays smaller, and finishes faster, but yields less per plant. Choose the photoperiod for maximum size and yield.