How to Grow Green Crack Autoflower
Green Crack Auto is a bright, energizing autoflowering strain built from an Afghani and Skunk #1 cross with a ruderalis, so it flowers on age. It is a balanced 50/50 hybrid with a medium 18-20% THC, a sweet, fruity, mango flavor, and a creative, energetic, uplifted effect. Fast, vigorous and easy, it brings the famous Green Crack daytime buzz to a quick auto grow.
As an autoflowering strain, Green Crack Auto flowers automatically with age rather than waiting on a change in the light cycle, so there is no need to switch it to shorter days. You simply give it long days from start to finish and it starts flowering on its own after a few weeks, running its whole life cycle in about 7 to 9 weeks from seed to harvest. That speed and simplicity are exactly what make autos so easy to grow.
Recommended Strains
Green Crack Auto
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THC | 18% - 20% (Medium) |
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Type | Autoflowering |
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Yield | High |
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Phenotype | 50% Indica / 50% Sativa |
Green Crack
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THC | 21% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 35% Indica / 65% Sativa |
Fruity, fast and energizing, Green Crack Auto is a rewarding auto to grow whether you are new to it or experienced. You can see the full genetics and buy Green Crack Auto seeds on the strain page, and browse the rest of our autoflowering seeds alongside it.
Strain Profile at a Glance
| THC | Medium (18-20%) |
|---|---|
| Lineage | Afghani x Skunk #1 x Ruderalis |
| Type | Autoflowering |
| Genetics | 50% Indica / 50% Sativa |
| Climate | Temperate |
| Life cycle | 7-9 weeks seed to harvest |
| Harvest (outdoor) | All season |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.8-1.97 oz/ft² (550-600 g/m²) |
| Yield outdoor | 4.23-7.05 oz/plant (120-200 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Fruity, Mango |
| Effects | Creative, Energetic, Uplifted |
Promos & Deals
Growing an Autoflowering Strain
Green Crack Auto flowers on its own schedule, starting to bloom a few weeks after it sprouts no matter how long the days are. That means you keep it under long light the whole way through, typically 18 hours on and 6 off, or even 20/4, from seedling right to harvest; there is no switch to a shorter day to trigger flowering. The trade-off is that you cannot delay flowering to grow the plant bigger first, so every week of healthy early growth counts.
Because autos grow fast and do not like having their roots disturbed, start Green Crack Auto in its final pot rather than transplanting it. Sow the seed straight into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. With a short life cycle of around 7 to 9 weeks from seed to harvest, a smooth start is the single biggest thing you can do for a strong, even finish.
Climate and Where to Grow It
Green Crack Auto suits a temperate climate and, like most autos, it is flexible about when you plant it. Because it flowers on age rather than on the season, you can run it at almost any time where the weather is warm enough, which is why its harvest window is listed as all season; outdoors you can even fit in more than one cycle in a long, warm year. At a moderate 1.5 m it slips easily into a tent or a sunny spot.
Yields are high for an auto: around 550-600 g/m² indoors in an optimized setup and 120-200 g per plant outdoors on its short cycle. As a vigorous, forgiving hybrid with classic skunk roots, it is easy and productive, so the main job is a smooth start and good light to build its dense, fruity colas.
Keep humidity sensible through flowering to protect those resinous buds: around 55-60% early on, nearer 40% as the flowers fill out, and lower toward harvest. Tight colas can trap moisture inside, so steady airflow through the canopy keeps the finish clean. Aim for temperatures around 68-80°F (20-27°C) for healthy, vigorous growth.
Feeding Schedule (EC Guide)
Green Crack Auto is a vigorous, productive auto, but autos want a lighter hand than photoperiod plants, so keep the feed modest and build slowly. Start very light, raise it gently as the plant grows, push a little more phosphorus and potassium through flower, then flush at the end so the sweet, fruity mango notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish in the final pot |
| Early growth | 0.8-1.2 | Raise nitrogen gently as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Green Crack Auto starts flowering a few weeks from sprouting and runs its whole cycle in about 7 to 9 weeks from seed to harvest, which is quick even for an auto, with no change in the light cycle needed. It fills out with dense, resin-coated, trichome-frosted buds, developing a bright, sweet, fruity aroma with a juicy mango note over its skunky base. Because it flowers on age, its harvest comes on a fixed, quick timeline.
Yields are high for an auto: around 550-600 g/m² indoors and 120-200 g per plant outdoors on its short cycle. Keep the colas supported and the canopy open so the lower buds get light, feed it lightly through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest sweet-mango flavor and the most energetic effect.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry protects the bright, fruity terpenes that give Green Crack its juicy mango character, so do not rush it with heat or a dehumidifier cranked too high.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the sweet, fruity and mango notes and smooths the smoke, turning a freshly dried auto harvest into the bright, juicy, energizing result Green Crack is known for.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Green Crack Auto is a resinous plant, so its trim is good for dry sift, bubble hash or rosin. That resin and bright, fruity-mango aroma make the trim genuinely useful, turning offcuts into a flavorful concentrate run rather than waste.
Flavor and Terpenes
Green Crack Auto leads with a bright, sweet, fruity flavor centered on a juicy mango note, the zippy, tropical profile that made Green Crack a daytime favorite, over a lightly skunky base from its Skunk #1 side. It is a smooth, sweet smoke, and a good cure really brings that fruity-mango character forward in the jar and on the inhale.
Its terpene profile shapes that flavor. Myrcene drives the sweet, fruity, mango-like base, while terpinolene adds the fresh, zippy, herbal lift that is a signature of Green Crack, and a touch of alpha-pinene brings a clean, piney edge. This simple, bright profile is exactly what gives the strain its juicy, energizing character.
Effects and Best Use
With its medium 18-20% THC and perfectly balanced 50/50 make-up, Green Crack Auto delivers a bright, clear-headed experience. It is reported as creative, energetic and uplifted, a classic daytime buzz that is ideal for staying active, productive or inspired. Its medium potency keeps it approachable and easy to dose, so it suits a daytime smoke without being overpowering.
That creative, energetic, uplifted profile makes it a go-to daytime strain, good for getting things done and staying social while enjoying its sweet, mango flavor. The combination of a fast, high-yielding auto grow, a bright, fruity terpene profile and an energizing effect is exactly why this Green Crack autoflower stands out. It is also available as a photoperiod Green Crack if you prefer the classic version.
Common Problems and Pro Tips
Green Crack Auto is forgiving, but autos reward a careful start. Sow it straight into its final pot to avoid a transplant check, go light on the nutrients while it is young, and do any training early and gently, because once an auto starts flowering it will not recover lost time. Stick to low-stress training only, and only while the plant is still growing.
At a moderate 1.5 m it is easy to manage, so the main jobs are a smooth start, good light and keeping the air moving around its dense colas. Hold humidity sensible through flower and defoliate a few of the largest fan leaves so light reaches the lower buds for an even, heavy finish from this quick, productive plant.
As a pro tip, protect what makes this strain special: its bright, fruity mango terpenes. Keep the feed modest, finish with a proper plain-water flush, and give it a full three to four week cure so the flavor stays juicy and clean. Save the resinous trim for concentrates, and harvest when most trichomes are cloudy with a few amber for a bright, energetic result.
FAQ
Is Green Crack Auto an autoflowering strain?
Yes. Green Crack Auto flowers automatically with age rather than on a change in the light cycle, so you keep it under long days, usually 18/6 or 20/4, from seedling to harvest. It starts flowering on its own a few weeks after sprouting and runs its whole life cycle in about 7 to 9 weeks from seed to harvest, which makes it fast and simple to grow.
Should I transplant Green Crack Auto?
No. Autos grow fast and do not like having their roots disturbed, so start Green Crack Auto straight in its final pot rather than transplanting it. Sow the seed into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. A smooth, uninterrupted start is the single biggest thing you can do for a strong finish.
How long does Green Crack Auto take?
Green Crack Auto runs its whole life cycle in about 7 to 9 weeks from seed to harvest, which is quick even for an auto, because it flowers on age rather than on the season. That short, fixed timeline means you can plant it almost any time where it is warm enough, and outdoors you can fit more than one cycle into a long, warm year.
What does Green Crack Auto taste like?
It has a bright, sweet, fruity flavor centered on a juicy mango note over a lightly skunky base. Myrcene drives the fruity, mango-like base, terpinolene adds a fresh, zippy herbal lift, and a touch of pinene a clean, piney edge. A proper three to four week cure really brings that juicy, fruity-mango character forward on the inhale.
How much does Green Crack Auto yield?
It is a high yielder for an auto, giving around 550-600 g/m² indoors in an optimized setup and 120-200 g per plant outdoors on its short cycle. Give it a big enough final pot, plenty of light and an open canopy, and support the colas so the dense, fruity buds develop fully right down the plant.
Is Green Crack Auto good for beginners?
Yes. It is an easy, vigorous and forgiving strain, and because it is an autoflower there is no light-cycle change to manage. It stays a manageable size, flowers in a quick 7 to 9 weeks and gives a heavy, fruity harvest with simple care, so it is a very rewarding plant for a first or early grow as well as for experienced growers.
