Speed has always been one of the biggest attractions of autoflowering cannabis genetics. While modern autos are now available with impressive potency, colourful flowers and increasingly complex terpene profiles, there is still something particularly appealing about a strain bred with one overriding objective: finish as quickly as possible.
So, what is the fastest autoflower strain available at SeedMasters.com?
Based on our current catalogue and the breeder-stated lifecycle times provided for the varieties we stock, one strain stands out as the fastest autoflower strain is immediately: +Speed Automatic by Sweet Seeds.
With a stated lifecycle of just 7 weeks from germination, +Speed Automatic is exceptionally quick even by autoflower standards. Better still, this isn’t simply an ordinary autoflower that happens to finish early. Sweet Seeds deliberately developed the genetics around the traits responsible for extremely rapid flowering.
For collectors interested in the extremes of modern autoflower breeding, +Speed Automatic is a fascinating strain to discover.
+Speed Automatic by Sweet Seeds
+Speed Automatic is a third-generation autoflowering strain from Spanish breeder Sweet Seeds.
Its genetics combine an autoflowering Critical Mass selection from the Sweet Seeds R&D programme with the breeder’s extremely fast Speed Devil #2 Auto.
Both parents were selected with rapid development in mind. The Critical Mass automatic line brought speed alongside its distinctive aroma, while Speed Devil #2 Auto reinforced the exceptionally fast autoflowering characteristics Sweet Seeds wanted to preserve.
The result was +Speed Automatic: a variety specifically developed by selecting for the genetic characteristics associated with very rapid flowering.
According to the current SeedMasters.com listing, the strain has a breeder-stated lifecycle of only 7 weeks from germination.
That figure is what makes +Speed Automatic so unusual.
How Fast Is +Speed Automatic?
A lot of confusion can arise when comparing the speed of different cannabis strains because breeders don’t always describe timing in exactly the same way.
A photoperiod strain, for example, might be advertised as having a flowering time of six or seven weeks. That figure normally describes the flowering phase rather than the strain’s complete lifecycle.
The fastest autoflower strains are often described differently, with breeders sometimes providing an estimated total time from germination.
That’s an important distinction.
+Speed Automatic is listed at just 7 weeks from germination, rather than seven weeks of flowering alone. Its name therefore isn’t simply clever marketing – rapid development was one of the main objectives behind the strain’s creation.
Breeder timings should naturally be viewed as estimates rather than guarantees, but on paper this remains one of the shortest complete autoflower cycles you’ll encounter in the SeedMasters.com collection.
Why Is +Speed Automatic So Fast?
The answer is found in its parentage.
Sweet Seeds didn’t simply cross a popular cannabis strain with an autoflower and hope for an early result. The breeder specifically selected genetics already demonstrating rapid characteristics.
One side of the cross comes from an automatic Critical Mass genetic line selected by the Sweet Seeds R&D department partly for its fast flowering.
That was crossed with Speed Devil #2 Auto, another cultivar already recognised within the Sweet Seeds catalogue for its rapid autoflowering characteristics.
By combining these lines and selecting for the genetic traits associated with exceptionally fast flowering, Sweet Seeds created the third-generation autoflower that became +Speed Automatic.
It’s a good example of how modern autoflower breeding has developed. Speed isn’t simply the result of adding ruderalis genetics anymore. Breeders can selectively refine autoflower lines over multiple generations while retaining desirable characteristics from their photoperiod ancestors.
It’s Not Just About Speed
Being the fastest isn’t particularly useful if everything else has been sacrificed to achieve it.
Fortunately, +Speed Automatic has considerably more going for it than a short lifecycle.
Genetically, it sits almost directly between indica and sativa:
Indica: 48.4%
Sativa: 48.5%
Ruderalis: 3.1%
That creates a remarkably balanced genetic profile for such a specialised autoflower.
THC levels are listed at approximately 15–20%, while CBD sits at around 0.7%.
Those figures won’t place +Speed Automatic among today’s extreme high-THC cultivars, but that’s arguably missing the point. This strain was developed primarily around rapid autoflowering genetics while still retaining an enjoyable terpene and cannabinoid profile.
It is a specialist autoflower with a very clear purpose.
Sweet, Fruity and Slightly Unusual
The flavour profile also gives +Speed Automatic more personality than you might expect from such a speed-focused variety.
Sweet Seeds describes aromas that combine sweet and fruity characteristics with touches of yeast and cheese, while our SeedMasters data sheet categorises the broader flavour profile as sweet, skunky and spicy.
It’s a slightly unusual combination.
The initial sweetness gives the strain an approachable character, but the yeasty, cheesy and skunky undertones introduce an older-school funk that helps distinguish it from the wave of candy and dessert cultivars dominating many modern seed catalogues.
That makes +Speed particularly interesting for collectors who appreciate contemporary autoflower genetics but don’t necessarily want another fruit-candy hybrid.
What Are the Effects of +Speed Automatic?
Despite its near-perfect indica/sativa balance, the reported effects cover a surprisingly broad spectrum.
The SeedMasters.com data sheet describes +Speed Automatic as offering characteristics associated with:
- Relaxation
- Happiness
- Stimulation
- Creativity
- Psychoactive effects
THC is listed between 15% and 20%, giving it respectable potency without entering the increasingly crowded 25–30%+ territory occupied by many newer strains.
For enthusiasts who judge genetics on overall character rather than THC percentage alone, that balanced combination may actually be part of the appeal.
+Speed Automatic vs Fast-Flowering Strains
Another useful distinction is the difference between autoflowering and fast-flowering cannabis seeds.
They’re not necessarily the same thing.
Fast-flowering or F1 Fast Version strains are generally photoperiod-dependent varieties bred to shorten the traditional flowering period.
Sweet Seeds itself offers several examples. Crystal Candy F1 Fast Version, for instance, is listed with a flowering period of approximately 6–7 weeks, but it remains a photoperiod-dependent strain.
+Speed Automatic is different because it is a genuine autoflower.
Its quoted seven-week figure refers to the breeder-stated period from germination rather than simply a shortened flowering phase.
When comparing strains purely on speed, checking exactly what the breeder’s timing refers to is therefore essential.
Is +Speed Automatic the Fastest Autoflower at SeedMasters?
From the current SeedMasters catalogue we reviewed, +Speed Automatic by Sweet Seeds is the fastest autoflower strain we could identify based on breeder-stated total lifecycle figures.
Its advertised 7-week cycle from germination puts it ahead of many already-quick autoflowering strains.
For comparison, another Sweet Seeds favourite, Red Poison Auto, is listed at approximately 8 weeks from germination.
One week might not sound like much, but when we’re comparing genetics specifically bred around speed, it is a significant difference.
It’s also worth remembering that breeder figures describe expected characteristics and should not be interpreted as an absolute timetable for every individual seed and enviroment.
Our Take on +Speed Automatic
At SeedMasters.com, we see +Speed Automatic as one of those strains that deserves attention because it represents a very specific side of cannabis breeding.
It isn’t trying to win the THC arms race.
It isn’t built around the latest fashionable American dessert strain.
And it doesn’t need an elaborate name to explain what makes it interesting.
+Speed Automatic is all about speed.
Sweet Seeds took two lines already associated with fast autoflowering characteristics and deliberately selected for the genetics responsible for even faster development. The resulting seven-week breeder-stated lifecycle makes it one of the most distinctive autoflowers in our collection.
Add a balanced indica/sativa heritage, 15–20% THC and a sweet, fruity, cheesy and skunky terpene profile, and there’s considerably more substance here than the name initially suggests.
For collectors fascinated by fast autoflower strains, older Sweet Seeds genetics or the evolution of automatic cannabis breeding, +Speed Automatic is certainly one of the fastest autoflower strains worth knowing about.
Discover +Speed Automatic at SeedMasters.com
Sweet Seeds has played an important role in the development of European autoflowering genetics, and +Speed Automatic remains a particularly interesting example of what can be achieved when a breeding project concentrates heavily on one characteristic.
If you’ve been searching for the fastest autoflower strain, +Speed Automatic deserves a place near the top of your list.
Explore +Speed Automatic by Sweet Seeds and discover more autoflowering cannabis seeds from leading international breeders at SeedMasters.com.
Cannabis seeds are sold strictly as adult souvenirs and for genetic preservation. Germination or cultivation of cannabis seeds is illegal in the UK and may be restricted elsewhere. Always check and follow the laws applicable in your country.
