Lemon Cherry Sundae Auto brings together two autoflowers with serious trophy shelves. On one side is Fast Buds’ own Lemon Cherry Cookies Auto, named Best Auto Hybrid 2025 at the American Autoflower Cup and Strain of the Year 2025 at The Grow Awards. On the other is Sundae Thumper F4 from Mephisto Genetics, a Best Autoflower Hybrid winner at the American Autoflower Cup.
The cross is an F1 hybrid feminized autoflower with up to 28% THC and a 60% indica / 40% sativa balance. Lemon Cherry Cookies contributes color, potency and flavor, while Sundae Thumper adds vigor and a strong habit of stacking buds. It is a loud strain from start to finish, built to stand out in the tent and in the jar.
Being an autoflower, it needs no light change to flower: run 18/6 or 20/4 for the whole cycle and it will be ready in about 8 weeks from seed. Fast Buds lists it as XXL, with plants reaching 70-110 cm (28-43 in). Indoor yields sit at 450-550 g/m² (1.5-1.8 oz/ft²), and outdoor plants give 60-180 g (2-6 oz) each.
Growth is quick and energetic from the seedling stage. Branches form naturally, and with a little guidance the plant opens into a wide, even bush covered in bud sites.
Color Show and Candy-Shop Terps
Lemon Cherry Sundae Auto is one of the more striking plants you can grow. As bloom progresses, the flowers can shift between purple, pink and green, wrapped in dense, oily buds that glisten under the lights.
The aroma heads straight for the candy counter. Cherry and citrus lead, followed by creamy sweetness, a cookie base, a hint of mango and a little floral funk. The smell is expressive and lingers long after the jar is closed.
Growers report a mainly happy and relaxed effect, often with an uplifted, creative or giggly side. Some note hunger or sleepiness later on, so it can work well as an evening option when you want something flavorful and easygoing.
Easy to Run, Heavy to Harvest
Despite the production, this plant is not fussy. It does not need special feeding and stays forgiving through the cycle. Expect the colas to swell fast once flowering starts; adding a net or a few stakes is a smart move before the branches start to lean.
Light low-stress training early on helps spread the bush evenly. Keep humidity in check during the last weeks, as dense, resin-packed flowers like good airflow.
Lemon Cherry Sundae Auto Characteristics
| Strain type | Autoflowering (feminized) |
| Genetics | Lemon Cherry Cookies Auto x Sundae Thumper (F1 hybrid) |
| Indica/Sativa | 40% Sativa / 60% Indica |
| THC | Up to 28% |
| CBD | Less than 1% |
| Effect | Happy, relaxed, uplifted, creative |
| Flavor | Cherry, citrus, cookie, mango, sweet cream |
| Indoor yield | 450-550 g/m² (1.5-1.8 oz/ft²) |
| Outdoor yield | 60-180 g/plant (2-6 oz/plant) |
| Seed to harvest | About 8 weeks |
| Height | 70-110 cm (28-43 in), XXL size class |
| Climate | Indoors, outdoors, greenhouse or mixed-light; any season with warm, stable weather outdoors |
| Best cultivation technique | Light LST and branch support |
FAQ
What are the parents of Lemon Cherry Sundae Auto?
It is an F1 cross of Fast Buds’ Lemon Cherry Cookies Auto and Sundae Thumper F4 from Mephisto Genetics.
What awards do its parents hold?
Lemon Cherry Cookies Auto won Best Auto Hybrid 2025 at the American Autoflower Cup and Strain of the Year 2025 at The Grow Awards. Sundae Thumper won Best Autoflower Hybrid at the American Autoflower Cup.
How long does Lemon Cherry Sundae Auto take?
About 8 weeks from seed to harvest, with no change to the light schedule needed.
Does Lemon Cherry Sundae Auto turn purple?
It can. Fast Buds describes a color show of purple, pink and green tones around dense, oily flowers.
Is it easy to grow?
Yes. It is forgiving and has no fussy feeding habits. The main task is supporting the heavy colas late in bloom.
What yield can I expect?
Indoors, 450-550 g/m² (1.5-1.8 oz/ft²). Outdoors, about 60-180 g (2-6 oz) per plant.
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