Guava Sundae Auto is a meeting of two cup champions. Fast Buds paired its World Cup-winning Guava Auto RF3 with Sundae Thumper F4 from Mephisto Genetics, which took a title at the American Cup. The plan was a single high-output autoflower that brings frame, production, and flavor together.
From the first weeks the F1 hybrid shows aggressive growth and clear hybrid vigor. It builds into a large, solid plant in the XXL size class, reaching 70-120 cm (28-47 in), with well-balanced internodal spacing that lets light reach deep into the canopy.
Pushed correctly, it is a serious producer: Fast Buds lists 450-600 g/m² (1.5-2 oz/ft²) indoors and 60-300 g (2-11 oz) per plant outdoors. Seed to harvest takes 8-9 weeks (about 56-63 days) under 18/6 or 20/4 light, with no need to change the schedule.
Genetically it sits right in the middle at 50% Sativa / 50% Indica, with THC rated at 26-30%.
Guava Meets Gelato
The buds grow big, weighty, and compact, finishing clean and even across plants and plenty of bag appeal. Dense stacking along each branch keeps the light working efficiently right through bloom.
The nose is loud from the start. Bright tropical guava comes first, then a creamy, dessert-like gelato depth fills out the background, giving a rich and loud bouquet that develops fully during the cure.
Growers most often describe the effect as happy, relaxed, and uplifted in roughly equal measure, with some creative and sociable energy mixed in. It is a balanced, good-mood hybrid rather than a sedating one.
Growing Guava Sundae Auto
Give it room to spread and a healthy root zone, since this is a large, high-output auto. Its even node spacing responds well to LST, and steady feeding through mid-bloom helps the heavy colas fill out. Strong airflow and a carbon filter round out the setup, since the guava-gelato aroma gets loud and the tight flowers need fresh air moving around them in the last weeks.
Guava Sundae Auto Characteristics
| Strain type | Autoflowering (feminized) |
| Genetics | Guava Auto RF3 x Sundae Thumper F4 (Mephisto Genetics) |
| Generation | F1 hybrid feminized autoflower |
| Indica/Sativa | 50% Indica / 50% Sativa |
| THC | 26-30% |
| CBD | Less than 1% |
| Effect | Happy, relaxed, uplifted |
| Flavor | Tropical guava, creamy gelato, sweet fruit |
| Indoor yield | 450-600 g/m² (1.5-2 oz/ft²) |
| Outdoor yield | 60-300 g/plant (2-11 oz/plant) |
| Seed to harvest | 8-9 weeks (56-63 days) |
| Height | 70-120 cm (28-47 in) |
| Size class | XXL |
| Grow setting | Indoor, outdoor, greenhouse, mixed light |
| Best cultivation technique | LST, steady feeding, 18/6 or 20/4 light |
FAQ
What are the genetics of Guava Sundae Auto?
It is an F1 cross of Fast Buds’ World Cup-winning Guava Auto RF3 and Sundae Thumper F4 from Mephisto Genetics, an American Cup title holder.
How strong is Guava Sundae Auto?
Fast Buds rates it at 26-30% THC, with CBD under 1%.
What does Guava Sundae Auto taste like?
Fresh tropical guava comes first, backed by a creamy gelato depth. The overall profile is rich, sweet, and loud.
How big does Guava Sundae Auto get?
It is in Fast Buds’ XXL size class and grows to 70-120 cm (28-47 in), with a solid frame and balanced internodal spacing.
How long does Guava Sundae Auto take to finish?
About 8-9 weeks (56-63 days) from seed, with 18/6 or 20/4 light the whole time.
What yield can I expect?
Indoors, Fast Buds lists 450-600 g/m² (1.5-2 oz/ft²). Outdoors, plants yield about 60-300 g (2-11 oz) each.
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