Think Fast is what happens when Dutch Passion crosses an autoflower with a photoperiod and keeps the best of both. The breeders paired their legendary Auto Think Different with a hand-picked clone of Power Plant, the classic cup winner, and found something unexpected in the first generation of seedlings: none of them autoflowered, yet they were all noticeably faster than their photoperiod parent.
That is the idea behind a “fast version” strain. Think Fast carries the autoflower gene recessively, so it behaves like a normal photoperiod plant: it vegetates as long as you want and only starts flowering when you switch the lights to 12/12 indoors or when days shorten outdoors. Once it does flip, though, it moves with real speed, finishing in about 7-8 weeks of bloom, with an average near 8. It is not an autoflower and won’t flower on its own under 18/6.
From Power Plant it inherits heavy production and flavor; from Auto Think Different it gets speed, vigor and toughness. Indoors, plants average around 500 g/m² (1.64 oz/ft²), and in a long outdoor season they become genuine monsters of 2-3 m (79-118 in).
For Sativa lovers stuck with short northern summers who don’t want to switch to autos, this is the answer.
Flavor, Effects, and a Pheno-Hunter’s Playground
Think Fast throws a wide range of terpene expressions, which is part of its appeal. Most plants land on a citrus-dominant profile backed by diesel, herbs and pine, with an earthy base. Other cuts swing sweet, fruity and floral. If you enjoy popping a full pack and choosing a keeper, there is plenty to explore here.
The aroma during bloom is strong without being overwhelming, and toward the end of flowering the buds disappear under a thick, sticky white layer of resin. That resin also makes trim and smaller buds well suited to hash and other concentrates.
The high is energetic, uplifting and long-lasting, with a slightly euphoric, creative start that suits productive days. The head effect leads, but there is a body component too. Go heavier and it turns into a deeper, more intoxicating relaxation that still won’t put you to sleep. Because the effect lasts for hours, a little goes a long way.
How Fast Genetics Change Your Grow
Indoors, Think Fast gives you full control over size: veg as long as you like, then flip to 12/12. Stretch after the flip is medium and internodes are short to medium, so it fits SOG and SCROG layouts alike. Experienced growers sometimes veg a single plant for 2-3 months before flowering it for a massive yield.
The plant loves training. It responds well to topping, fimming, cropping and supercropping, and can be grown as a wide, multi-topped bush. Tall phenotypes should be topped several times; shorter ones tend to spread sideways. Either way, support the heavy colas late in bloom so they don’t sag or snap in wind.
Outdoors is where the fast genetics pay off. In temperate climates, Think Fast is typically ready in October, and some growers harvest as early as late September, ahead of many conventional photoperiods. For latitudes similar to the Netherlands, Dutch Passion suggests pre-growing indoors in March, April or May and moving the plants out in late May or early June.
Put them in a sunny spot, ideally in organic soil, strip some leaves during the season for airflow, and remove dead foliage to reduce the risk of mold. The autoflower ancestry also helps it handle temperature swings outdoors, and it copes well with guerrilla grows once pre-grown.
Think Fast Characteristics
| Strain type | Feminized photoperiod, fast flowering |
| Genetics | Auto Think Different x Power Plant |
| Indica/Sativa | Sativa-dominant hybrid |
| THC | Very high |
| Effect | Energetic, uplifting, creative; relaxing at higher doses |
| Flavor | Citrus, diesel, herbs, pine, earth; some sweet floral phenos |
| Indoor yield | Around 500 g/m² (1.64 oz/ft²) |
| Outdoor yield | Very large; varies with season length, sunlight and care |
| Flowering time | 7-8 weeks after switching to 12/12 |
| Outdoor harvest | October in temperate climates, sometimes late September |
| Height | Outdoors 2-3 m (79-118 in); up to 3.5 m (138 in) in a greenhouse |
| Structure | Vigorous, medium stretch, short-to-medium internodes |
| Bud appearance | Aromatic colas with a thick, sticky white resin layer |
| Best cultivation technique | Repeated topping, fimming, supercropping, SCROG or SOG |
FAQ
Is Think Fast an autoflower?
No. Think Fast is a feminized photoperiod plant that carries the autoflower gene recessively. It needs 12/12 light indoors, or shortening days outdoors, to start flowering, but it finishes faster than most standard photoperiods.
How long does Think Fast take to flower?
Most plants finish in 7-8 weeks after the switch to 12/12, with an average of about 8 weeks. Faster phenotypes can be done in 7 weeks.
When can I harvest Think Fast outdoors?
In temperate climates the harvest usually falls in October, and some growers have harvested at the end of September.
How big does Think Fast get?
Outdoors, plants commonly reach 2-3 m (79-118 in), and up to about 3.5 m (138 in) in a greenhouse or polytunnel. Indoors you control the size with veg time and training.
What yield can I expect from Think Fast indoors?
Indoor yields average around 500 g/m² (1.64 oz/ft²), and experienced growers can push higher with training and a longer veg.
Is Think Fast good for beginners?
Yes. It is tough, stable and forgiving, so newer growers get good results, while experts can use repeated topping and SCROG to unlock very large harvests.
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