Grandpa’s Stash R2 is the easygoing workhorse of the Ethos Genetics range. Rooted in Super Skunk, Afghan Kush and OG Kush, it thrives anywhere, shrugs off mold and mildew and stacks huge flowers all the way down a stocky frame, finishing in roughly 56-60 days with TAC up to 30%.
Its natural resistance to mold and mildew makes it a strong pick for wet seasons and short outdoor summers, while indoors it is simple, fast and forgiving. The breeder rates the yield as monster.
Expect earthy aromas of sweet pine, chem and skunk. For anyone looking for Ethos seeds that are beginner friendly and dependable, the Grandpa’s Stash strain is one of the clearest choices in the catalog.
Lineage and Breeding: Grandpa’s Stash #5 x #12
The cross pairs two Grandpa’s Stash keepers, #5 and #12. Their background combines Super Skunk, Afghan Kush and OG Kush, three old-school lines known for toughness, fast finishing and loud, earthy terpenes. Grandpa’s Stash also serves as a parent in the Grandpa’s Cookies family.
R2 stands for the second reversed-female feminized generation. A selected female is reversed to make pollen and used on another selected female from the same line, building on an earlier round of selection for more consistent plants across the pack.
Aroma, Flavor and Effect
The bouquet is sweet pine, acrid chem and skunk, with earthy, peppery and spicy layers that Ethos lists among its terpene families. It is classic, old-school and loud, the kind of smell that fills a room long before harvest.
Effects lean indica-hybrid: a grounded, comfortable body feel with a calm and relaxed head. With TAC up to 30%, it has plenty of strength for evening sessions.
Growing Grandpa’s Stash R2 Indoors and Outdoors
Indoors, Grandpa’s Stash R2 keeps a stocky, medium frame with medium internodes, which suits small tents and sea-of-green setups. Light topping and a trellis help spread the canopy, but she performs well even with minimal training. Flowering starts quickly after the flip, and she ripens fast.
Outdoors, she is built for tough conditions. Mold and mildew resistance makes her well suited for short or wet seasons, and her quick 56-60 day bloom helps her beat autumn rains. Plant in full sun, keep an eye on airflow around the huge colas, and expect a big harvest from a compact plant.
Grandpa’s Stash R2 Characteristics
| Strain type | Feminized photoperiod |
| Generation | R2 (second reversed-female feminized generation) |
| Genetics | Grandpa’s Stash #5 x Grandpa’s Stash #12 (Super Skunk, Afghan Kush, OG Kush) |
| TAC | Up to 30% (Total Active Cannabinoids) |
| Effect | Indica-leaning hybrid, grounded and calm |
| Aroma/Terpenes | Sweet pine, chem, skunk, earthy and peppery spice |
| Yield | Extremely high (the breeder calls it monster) |
| Flowering time | 56-60 days or faster |
| Height | Medium, stocky |
| Grow level | Beginner to pro |
| Ideal environment | Indoor, greenhouse and outdoor, including short or wet seasons |
| Best cultivation technique | Sea of green or light topping |
FAQ
What are the parents of Grandpa’s Stash R2?
Grandpa’s Stash #5 x Grandpa’s Stash #12, with roots in Super Skunk, Afghan Kush and OG Kush.
Is Grandpa’s Stash R2 mold resistant?
Yes. Ethos Genetics describes natural mold and mildew resistance, which makes it well suited to short or wet seasons outdoors.
Is Grandpa’s Stash R2 good for beginners?
Yes. It is rated beginner friendly and grows easily indoors or outdoors.
How long does Grandpa’s Stash R2 flower?
Around 56-60 days or less. It starts flowering quickly after the switch and ripens fast.
What does the Grandpa’s Stash strain smell like?
Sweet pine, chem and skunk with earthy, peppery spice.
How big is the yield?
The breeder rates the yield as monster, with a stocky frame stacking huge flowers all the way down the plant.
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