Sundae Frost Auto brings together two autos with strong competition records. Fast Buds’ own Frostbanger Auto F4 won the Strongest Autoflower title at the Autoflower World Cup, and Sundae Thumper from Mephisto Genetics took Best Hybrid at the American Autoflower Cup. Combined, they form an F1 hybrid feminized autoflower aimed at speed, efficiency and visual appeal.
It is a balanced 50% sativa / 50% indica plant with THC up to 30%. Fast Buds lists a flowering time of 7-8 weeks, and the full run from seed to harvest takes about 70-75 days. As an autoflower, it needs no light change: keep 18/6 or 20/4 for the whole cycle.
Fast Buds rates it XXL, with plants at 70-100 cm (28-39 in). Indoor yields reach 450-600 g/m² (1.5-2 oz/ft²), and outdoor plants give 80-250 g (3-9 oz) each.
Its compact height and quick turnaround make it a good fit for small spaces and for growers who want to fit more cycles into the year.
Two Looks, One Aroma
In testing, Fast Buds found two clear phenotypes that differ only in color. The first has mostly green buds with light purple or pink accents, and its leaves stay green right through to harvest. The second is more dramatic: the flowers keep their green base with purple streaks, while the foliage darkens to a deep, almost black shade, giving the plant a premium, eye-catching look.
Both share the same profile. Expect a sweet, spicy and fresh scent with fruity notes and a clean, lively character, plus a subtle depth that grows as the buds mature. The breeder sums it up as a dessert gas profile: creamy sweetness over a heavier edge.
With a THC ceiling of 30% and a 50/50 genetic balance, this is a potent hybrid. Take it slow until you know how it sits with you.
Fast, Uniform and Frosty
Sundae Frost Auto grows with a uniform structure, so plants line up evenly in a tent or a sea of green. Gentle low-stress training early in the cycle opens the canopy without slowing it down.
The frost is thick enough to stand out both visually and for processing, making the harvest a good option for hash and rosin. Keep airflow strong late in bloom to protect the dense, sticky buds.
Sundae Frost Auto Characteristics
| Strain type | Autoflowering (feminized) |
| Genetics | Frostbanger Auto F4 x Sundae Thumper (F1 hybrid) |
| Indica/Sativa | 50% Sativa / 50% Indica |
| THC | Up to 30% |
| CBD | Less than 1% |
| Flavor | Sweet, spicy, fresh, fruity, creamy |
| Indoor yield | 450-600 g/m² (1.5-2 oz/ft²) |
| Outdoor yield | 80-250 g/plant (3-9 oz/plant) |
| Seed to harvest | About 70-75 days (7-8 weeks of flowering) |
| Height | 70-100 cm (28-39 in), XXL size class |
| Climate | Indoors, outdoors, greenhouse or mixed-light; any season with warm, stable weather outdoors |
| Best cultivation technique | Light LST or sea of green |
FAQ
What are the parents of Sundae Frost Auto?
It is an F1 cross of Fast Buds’ Frostbanger Auto F4 and Sundae Thumper from Mephisto Genetics.
Which awards are in its lineage?
Frostbanger Auto won the Strongest Autoflower title at the Autoflower World Cup, and Sundae Thumper took Best Hybrid at the American Autoflower Cup.
How fast is Sundae Frost Auto?
Fast Buds lists 7-8 weeks of flowering and a full cycle of about 70-75 days from seed to harvest.
Why do some plants have black leaves?
One of the two phenotypes develops deep, almost black leaves, while its buds stay green with purple highlights. The other stays green with light purple or pink accents.
What does Sundae Frost Auto smell like?
Sweet, spicy and fresh, with fruity notes and a creamy, slightly heavy depth that grows as the buds mature.
What yield can I expect?
Indoors, 450-600 g/m² (1.5-2 oz/ft²). Outdoors, about 80-250 g (3-9 oz) per plant.
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