Speedy Gonzales aka Speedy Boom Auto

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When you shop at the London Seed Centre you are guaranteed a minimum of one free seed with every order.

The more you spend the more free seeds you’ll receive bundled in with your order.

What’s more, our freebies are some of the most popular strains on the market provided by the most reputable manufacturers, so rest assured you won’t be disappointed!

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Speedy Boom (formerly Speedy G, Speedy Gonzales) is a true thoroughbred auto strain. It is a very psychoactive strain which smokes with a hot intensity.

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This autoflowering marijuana strain has been one of the best sellers of our seed bank for three years thanks to its yield, efficiency, and the load of joy it packs. In its veins runs the blood of royalty combined with the picaresque streak of the common people, bringing together the best of both worlds. Speedy Boom Auto, also known as Speedy Gonzales, is highly appreciated by growers who want a reliable and curious plant that gives off good vibes.

Yes, its mother belongs to the aristocracy. The Kaboom or African Queen is a sativa monarch that, mixed with a Ruderalis, has given rise to this small but potent rascal with optimized flowering periods and great yield. 

This is an indoor animal (well, plant) – and indoors is where it fully develops. A captive gremlin with thin, serrated, dark leaves that will make you laugh with its intense psychoactive power every time you take it out for a walk. With each testimonial that we receive, we are closer to being able to say that this is one of the best automatic marijuana seeds in our catalog.   

Little can be said for how to grow Speedy Boom Auto so that it works, because this is a very hearty marijuana plant in and of itself. However, we must emphasize that it should be grown indoors because it does not reach much of a height (always below one meter) and because, with a Sea of Green technique, it will give you great performance. The best thing to do is to apply photoperiods of 18/6 during growth and 12/12 during flowering. 

You’ll see how that average internodal spacing evolves towards a fir in terms of shape – with the cola being the protagonist. The buds are tight and consistent, populated with glitter trichomes… and, if you dare to experiment, you can further reduce light exposure in the last few weeks of flowering to make them even more potent. The entire process should take between 65 and 70 days and yield no less than 400 grams per square meter.

Outdoors it will also grow well because that’s why it’s an all-road automatic strain – but it will always have a low height. You’ll find that it’s plump, almost as wide as it is tall. Plant this autoflowering marijuana seed between March and October (if possible in the spring or at the beginning of summer), and you will harvest approximately 180 grams per plant. Don’t do transplants and let it get as much sun as it can. It resists mold and pests well, but keep an eye on it just in case – especially at the end of the process. 

Speedy Boom Auto has a spicy aftertaste, which is to be expected…. It also has a sweet and fruity flavor, very fresh. It is the closest we have to trying an excellent fruity menthol caramel. 

Its effect is very stimulating. It either gets you laughing or drives you to save the world with new ideas. It has 13% THC levels and its sativa nature brings you euphoria and joy. Highly recommended to treat states of anxiety or sadness. It is also ideal for sharing positive experiences with friends and awakening the part of the brain that makes us happy.

More Information
Cup Winner No
Medicinal No
Flowering Type Autoflowering
Yield Medium
THC Content Medium (10-15%)
CBD Content Low (0-1%)
Environment Indoor, Outdoor, Greenhouse
Genetics Ruderalis/Sativa
Height Short
Flowering Time 9-10 WEEKS


FREE 3-5 Day Standard Delivery™

Free standard delivery on your order for delivery within approximately 3-5 days.
(Applies to orders over £50 only)

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Special Delivery Guaranteed by delivery the next working day. The benefits include end to end tracking and signature on delivery online or via your mobile (royal mail website) compensation cover up to £500 for loss and damagesend items up to 20kg


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*sometimes £250, depending on the destination.

International Signed For™ items are tracked until they leave the UK when sent by Airmail. Tracking is also available in a number of overseas destinations to delivery.

Delivery aims:

  • to Europe within three to five working days of posting
  • to Rest of World within five to seven working days of posting

* Delivery is in working days and excludes day of posting, Saturdays and Sundays.



Trusted for fast and secure international mail Airsure® receives priority handling in the UK and abroad and is generally a day faster than standard Airmail.

Our aim is to deliver:

  • to Western Europe within two to three working days of posting
  • to Eastern Europe within three to four working days of posting
  • to the rest of the world within six to seven working days of posting.

* Delivery is in working days and excludes day of posting, Saturdays and Sundays.

Note: This service does not guarantee delivery within the timescales indicated. Neither does it offer compensation for delay or for missing tracking information.


Airmail will aim to deliver your mail to:

  • Western Europe within three working days
  • Eastern Europe within five working days
  • major cities worldwide within five working days and other destinations within seven..


You can exchange an unwanted item for a replacement or store credit of the same value if the item is still in the original breeder packet which remains sealed. We will not under any circumstances exchange or replace an open packet. Due to the nature of our products, we cannot give refunds. Kindly note that any items being sent back to us should be sent by recoreded delivery, and the tracking number sent to us by email to [email protected].


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