How To Grow Guanabana from Seed to Harvest 

Guanabana by Blimburn Seeds is an uplifting, fruity sativa named after the exotic soursop fruit. From Amnesia Haze x White Widow, it pairs a sweet, fruity flavor with a happy, social, creative effect, at an easygoing 16-18% THC. It is a feminized photoperiod plant that grows tall and yields well, making it a rewarding, flavorful grow for anyone who loves a classic uplifting sativa, provided you can handle its height. 

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. The figures below are Blimburn’s breeder values; check your own pack for the exact numbers. 

Recommended Strains

Guanabana

	THC	16% - 18% (Medium)
	Lineage	Amnesia Haze x White Widow
	Type	Feminized
	Height	9.84 ft | 3 m
	Yield	High
	Yield Indoor	1.64 - 1.97 oz/ft² | 500 - 600 g/m²
	Yield Outdoor	21.16 - 24.69 oz/plant | 600 - 700 g/plant
	Flowering Time	8 - 10 weeks
	Phenotype	40% Indica / 60% Sativa
	Medical	Arthritis, Depression, Fatigue
	Effects	Happy, Relaxed, Talkative
	Flavors	Fruity, Sweet

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3 Seeds - $496 Seeds - $859 Seeds - $9825 Seeds - $24250 Seeds - $407100 Seeds - $727 Add to cart

Guava Auto

	THC	27% - 28% (High)
	Lineage	Guava x Ruderalis
	Type	Autoflowering
	Height	3.28 ft | 1 m
	Yield	High
	Yield Indoor	1.47 - 1.8 oz/ft² | 450 - 550 g/m²
	Life Cycle	8 - 9 weeks
	Phenotype	50% Indica / 50% Sativa
	Effects	Relaxed, Happy, Uplifted
	Flavors	Fruity, Guava, Sweet

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3 Seeds - $425 Seeds - $65 Add to cart

Guanabana Grow Info 

These are Blimburn’s published figures for the Guanabana line at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own Guanabana seed pack. 

What Makes Guanabana Worth Growing 

Guanabana is a classic uplifting sativa with a tropical twist. Its Amnesia Haze and White Widow heritage gives it a happy, social, creative, talkative effect and a sweet, fruity flavor, approachable at an easygoing 16-18% THC. It is the kind of strain made for daytime, conversation, and creative activity rather than sedation. 

It is also a strong producer. It yields a high 500-600 g/m² indoors and finishes in a reasonable 8-10 weeks for a sativa. The main thing to plan for is its height, since it grows tall like its Haze parent, so it rewards growers with vertical space or a willingness to train. 

Is Guanabana Indica or Sativa? 

Guanabana is sativa dominant, listed at 60% sativa and 40% indica, from Amnesia Haze crossed with White Widow. 

That sativa lean defines the experience: a happy, uplifting, talkative, creative high that leans to daytime and social use. The White Widow side adds some resin and a touch of balance, but the plant grows tall and stretchy like its Amnesia Haze parent, so expect a classic sativa structure. 

Flowering Time vs Full Grow Time 

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

• Flowering time: 8-10 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 reasonable for a sativa. 

• Full grow time (seed to harvest): flowering plus however long you veg. Indoors, a typical grow runs around 4.5 to 5 months from seed, depending on veg length. 

The practical point: because it stretches tall, keep veg shorter indoors to control height. Outdoors, expect to finish around early to mid October. 

Does Guanabana Need a 12/12 Light Cycle? 

Yes. Guanabana 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 is a stretchy sativa, 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. 

Guanabana 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 tall frame. 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 sativa 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. Buds fill out and the sweet, fruity aroma develops. 

• Weeks 9-10 of flower: ripening and harvest. Judge by trichomes, not the calendar. 

Choosing Your Setup: Space, Light and Pots 

Space is the key factor. Guanabana can hit 3 m, so indoors it needs headroom, an early flip, and firm training. A SCROG net or heavy low stress training helps control the height and spread the long colas. 

Give it strong light for the best sativa buds. A full-spectrum LED at 30-40 watts per square foot over the flowering canopy keeps the buds as dense as possible. Add a good inline exhaust fan and a carbon filter for the fruity aroma. 

For pots, 3-5 gallon containers suit most indoor grows, toward the larger end for this bigger plant. 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 tall sativa, 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 stretch. Combine it with a SCROG net or extensive low stress training to spread the growth and expose more 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 Guanabana 

Feed to the stage. Use a nitrogen-forward base through veg, then move to a bloom formula higher in phosphorus and potassium once you flip to 12/12 and buds form. A vigorous sativa handles a solid feed, but start moderate and increase based on how the plant responds rather than overfeeding early. 

Water by root-zone moisture, not a timetable, and expect a big plant to drink a fair amount. Let the top inch or two of medium dry between waterings, then water thoroughly until a little drains. Fabric pots and this water-to-weight habit keep the roots healthy. 

Flowering and Knowing When to Harvest 

Once you flip to 12/12, brace for a major sativa stretch, then buds build over the 8-10 week bloom. The sweet, fruity aroma develops, so keep air moving and run a carbon filter 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, uplifting sativa 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 fruity flavor. 

Growing Indoors vs Outdoors 

Indoors, Guanabana needs a tall space and firm training. Keep veg short, flip early, use a SCROG, and give strong light, and the high 500-600 g/m² yield is reachable. 

Outdoors is a natural home for a tall sativa, where it can stretch fully and return a high 600-700 g per plant, usually finishing around early to mid October. It needs a warm season, full sun, rich well-draining soil, and support for the long branches. Give it room and airflow around the buds. 

How Tall and How Much? Height and Yield 

Height is the headline. Guanabana can reach 3 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 strong producer, listed as high at around 500-600 g/m² indoors and 600-700 g per plant outdoors. Strong light and a well-managed canopy are what turn its potential into real weight across the plant’s large frame. 

Best US Climates for Guanabana 

Guanabana needs a warm, sunny climate and room to grow tall outdoors, so it suits growers in California, the Southwest, and the warm South and West who can take it into October with space. Its reasonable 8-10 week flower also helps it finish in many climates. 

In cooler or shorter-season states, its height and sativa stretch are easier to manage indoors, where you control the environment. In the humid Southeast, keep airflow strong around the buds. For shorter options, browse our full how-to-grow guide library. 

Common Problems When Growing Guanabana 

A few predictable issues come with a tall sativa. 

Running out of height 

The main indoor mistake 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. 

Airy buds from weak light 

Sativa buds are naturally less dense. Give strong light across the whole canopy and train the plant open, or lower buds stay fluffy. 

Underestimating the stretch 

Even for a sativa, the Amnesia Haze side stretches a lot. Flip early and use topping and a SCROG net to keep the canopy even and in bounds. 

Harvesting by the calendar 

The 8-10 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 

Do not waste the trim. The sugar leaves make good bubble hash, dry sift, or infused oil that keeps the sweet, fruity character. The stems, roots, and fan leaves compost well and feed your next grow. 

Is Guanabana Right for You? 

If you want an uplifting, social, fruity sativa with easygoing potency and strong yields, and you have the height and patience to grow it, yes. It is a great daytime and creative strain. If you have a small tent or want a compact, high-THC indica, look elsewhere. Browse our full how-to-grow guide library for alternatives. 

Frequently Asked Questions 

Is Guanabana indica or sativa? 

Guanabana is sativa dominant, listed at 60% sativa and 40% indica, from Amnesia Haze crossed with White Widow. The effect is happy, uplifting, talkative, and creative, leaning to daytime and social use. The White Widow side adds resin and a little balance, but the plant grows tall and stretchy like its Amnesia Haze parent. 

Does Guanabana need a 12/12 light cycle? 

Yes. Guanabana is a photoperiod strain, so indoors it needs a 12/12 light cycle to start and maintain flowering. Because it is a stretchy sativa, 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 Guanabana take to grow? 

Guanabana flowers in 8 to 10 weeks once you switch to 12/12, reasonable for a sativa. Total seed-to-harvest time depends on veg length, usually around 4.5 to 5 months indoors, and keeping veg short helps control its height. Outdoors it finishes around early to mid October. Judge the finish by trichome maturity. 

How much does Guanabana yield? 

Guanabana is a high yielder, at around 500 to 600 g/m2 indoors and 600 to 700 g per plant outdoors. Its tall growth contributes to the yield when you train it well. Strong light, an early flip, a SCROG or topped canopy, and a healthy root zone are what turn its potential into real weight. 

How tall does Guanabana get? 

Guanabana can reach up to 3 m, a tall sativa, 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 Guanabana? 

Yes. As a photoperiod strain, Guanabana 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 plant you like and run repeatable harvests without buying new seeds each time, which autoflowers cannot do. 

What does Guanabana taste like? 

Guanabana has a sweet, fruity flavor, named after the tropical soursop fruit, with the lively character of its Amnesia Haze and White Widow parents. To protect those aromas, run a carbon filter in flower, dry slowly at around 60°F with moderate humidity, and cure in sealed jars, burping daily early on to keep the fruity notes bright.