Grandpa Larry OG Feminised

Here is what Grandpa Larry OG delivers at harvest: up to 350 g/m2 per square metre indoors, up to 400 g/plant per plant outdoors in Irish conditions, with resin production peaking at 18% THC. Those numbers tell a story when you work backwards through the 60-70 days window. The bulk of your final weight accumulates during weeks 5 through 8 — a period where the 76/24 genetics stack calyxes rapidly and trichome coverage shifts from scattered to frosted. Outdoor growers targeting an early-October harvest should count backwards from there, aiming for buds to enter this critical fattening stage through September while there is still usable light and before the wettest weeks arrive.

To reach the upper end of this strain's yield potential (up to 350 g/m2 indoors, up to 400 g/plant outdoors), focus your efforts on three critical windows during the 60-70 days period.

Window 1: The first 10 days after flowering begins. Stretch management determines canopy uniformity, which directly impacts light distribution and final yield. Expect modest stretch of 20-30% — a quick defoliation of lower fan leaves at day 7 redirects energy to developing bud sites.

Window 2: Weeks 3-5 of bloom. Caryophyllene terpene biosynthesis ramps up during this period. Maintain a day/night temperature differential of at least 6-8°C to encourage terpene accumulation. Outdoors in Ireland the sea keeps that swing narrow — a maritime climate has a smaller diurnal range than a continental one, and the midland counties away from the coast are the only places that reliably deliver it. Indoor cultivators should target 25-26°C during lights-on and 18-20°C during lights-off. Supplement with potassium-heavy bloom nutrients at EC 1.6-1.8.

Window 3: Final 10-14 days before harvest. Cease all nutrient input and flush with pH-adjusted water. Monitor trichomes daily with a 60x jeweller's loupe — harvest at 15-20% amber for the full-bodied effect this genetics is known for. Outdoor growers: this window typically falls through the second half of September.

Flowering: 60-70 days. Indoor yield: up to 350 g/m2. Outdoor yield: up to 400 g/plant. Plant height: 90-120 cm. Medium. Rated moderate difficulty.

The sensory arc of Grandpa Larry OG unfolds in stages. Initial inhalation at 18% THC brings a warm peppery spice that tingles at the back of the throat. The euphoric, creative, calm effects emerge within minutes, beginning as a pleasant heaviness behind the eyes that migrates downward through the shoulders, chest, and limbs. By the fifteen-minute mark, a deep physical stillness sets in — not sedation exactly, but a reluctance to move that makes the couch remarkably appealing. Duration runs 2-3 hours at moderate doses. The myrcene secondary terpene adds a distinct layer: additional body depth that reinforces the physical dimension.

Primary: Caryophyllene · Secondary: Myrcene · Tertiary: Bisabolol. Together these three compounds construct an aromatic signature that evolves throughout the curing process. Freshly dried flower leads with caryophyllene presence, but after three to four weeks in sealed glass jars at 16-18°C, the bisabolol undertone strengthens and the overall bouquet develops a layered complexity. Vaporisation between 180°C and 195°C captures the broadest spectrum of these terpenes — higher temperatures degrade the more volatile bisabolol molecules first.

Who grows Grandpa Larry OG successfully? Indoor growers seeking full control over their harvest timeline. Outdoor cultivators who want to decide exactly when flowering begins. Anyone with the space and patience to vegetate this plant to its full potential before triggering bloom. Difficulty is rated moderate, meaning a moderate learning curve that rewards attention without demanding laboratory-grade conditions. Delivered nationwide in discreet, unbranded packaging with sourced grow data on every strain page.