Klementine S1

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Basic infos

Klementine S1 is an mostly sativa from R-KIEM Seeds and can be cultivated indoors and outdoors (Where the plants will need a flowering time of ±63 days) R-KIEM Seeds's Klementine S1 is only available as feminized seeds.

R-KIEM Seeds Description

Klementine S1 is a standout strain in the catalog of R-Kiem Seeds, defined by its explosive citrus profile, abundant resin production, and an active, long-lasting effect that places it among the most complete genetics in the lineup. Developed as an S1 from an elite-selected clone, it delivers a level of uniformity and stability that is rarely found in standard seed versions.

Klementine S1 is the self-pollination (S1) of an elite clone derived from the original cross Tangerine Sunrise × Gupta Kush, developed by R-Kiem Seeds. Tangerine Sunrise brings a refined citrus-forward foundation, while Gupta Kush—descending from Ghost OG—adds aromatic depth, body to the effect, and a subtle indica influence that balances the profile. The result is a sativa-dominant variety with up to 25% THC, powerful, expressive, and highly distinctive.

Indoors, Klementine S1 finishes flowering in 58–65 days (8–9 weeks) and can reach up to 650 g/m² under optimal conditions. It grows with vigorous, open branching typical of sativa structures and shows a pronounced stretch early in flowering, making training techniques like SCROG or bending highly recommended. It responds very well to these methods, and its excellent calyx-to-leaf ratio combined with dense trichome coverage also makes it a strong candidate for resin extractions.

Outdoors, harvest is typically ready by mid-October in the northern hemisphere. The plant adapts easily to different substrates and cultivation systems, with a medium difficulty level that suits growers with some experience. Support stakes are recommended, as lateral branches may require reinforcement during the final flowering stage due to heavy bud weight.

Klementine’s aromatic profile is its defining feature. Bright orange and tangerine notes dominate immediately, followed by sweet citrus layers with subtle Haze undertones and a musky, earthy Kush background. The aroma is complex, persistent, and highly appreciated by citrus-strain enthusiasts. On the palate, it mirrors this depth with ripe citrus fruit, earthy nuances, and a musky finish that creates a layered tasting experience.

The effect is uplifting, euphoric, and mentally stimulating, making it well-suited for daytime use. Gupta Kush adds a balancing influence that prevents overstimulation, extending the functional clarity while maintaining enjoyment. The result is a powerful, long-lasting effect that supports activity without becoming overwhelming.

•  Feminized seeds ✔ 
•  Seed bank: R-Kiem Seeds
•  THC: High (15–25%) 
•  Genotype: Sativa +60% 
•  Flavor: Fruity, citrus, Haze, earthy 
•  Easy to grow ✔ 
•  Suitable for extractions ✔ 
•  Effect: Stimulating 
•  Outdoor harvest: Autumn 
•  Indoor flowering: Fast (-9 weeks) 
•  Indoor yield: High (500–600 g/m²) 
•  Outdoor yield: High (400–1000 g/plant) 
•  Genetics: Tangerine Sunrise, Gupta Kush