Runtz XL Auto is Sweet Seeds’ extra-large autoflowering version of Runtz, the Z x Gelato hybrid that shook up the California scene and became one of the most aromatic and potent genotypes on the US West Coast. Listed as variety SWS88, this sixth-generation auto keeps the candy-sweet character and adds a quick, 8-week cycle from germination.
The genetics sit close to the middle at 47.1% Indica, 52.5% Sativa and 0.4% Ruderalis. Plants reach 60–120 cm (24–47 in), produce high yields for an auto and build buds rich in terpenes.
THC is listed at 17–25%, and the effect is powerful yet balanced: calm and relaxed in the body, with plenty of room for imagination and creative ideas.
Runtz Clone x Sweet Gelato Auto
Sweet Seeds crossed a carefully selected Runtz clone with handpicked plants of its own Sweet Gelato Auto (SWS76). The Runtz side contributes the famous fruit-candy bouquet and potency, while Sweet Gelato Auto brings the autoflowering trait, dense Gelato-style buds and extra resin.
The XL label marks the breeder’s newer generations of autos, bred for more size and production than older automatic strains while still finishing in a matter of weeks.
Aroma, Flavor and Effect
High terpene concentrations give the buds a very intense, delightfully sweet and fruity bouquet, like opening a bag of mixed fruit candies. Musky undertones and a floral lift add depth and keep the sweetness from becoming one-note. The flavor is smooth and sugary on the inhale, with the floral and musky notes lingering afterward.
The effect is strong and well rounded. A peaceful, relaxing calm spreads through the body while the mind stays stimulated, imaginative and in a creative mood. It suits relaxed social evenings, music and creative projects.
With THC that can reach 25%, it is wise for occasional consumers to start slow.
Growing Runtz XL Auto Indoors and Outdoors
As an autoflower, Runtz XL Auto needs no light switch: keep 18/6 or 20/4 from seed to harvest. Give it a final container of 11–15 liters (3–4 gallons) from day one so the XL genetics can reach their full size within the short cycle.
Indoors the breeder lists 400–550 g/m² (1.31–1.80 oz/ft²). LST in weeks two and three spreads the branches and improves light penetration, helping the side buds fill out. Strong carbon filtration is useful: the sweet terpene load is loud in late bloom.
Outdoors, plants produce 50–175 g/plant (1.8–6.2 oz/plant) with plenty of sun and good soil. The 8-week cycle lets you plan several crops between spring and fall in most of the US.
Runtz XL Auto Characteristics
| Strain type | Feminized autoflowering |
| Variety code | SWS88 |
| Genetics | Runtz (Z x Gelato) x Sweet Gelato Auto (SWS76) |
| Indica/Sativa | 47.1% Indica / 52.5% Sativa / 0.4% Ruderalis |
| THC | 17–25% |
| CBD | 0.5% |
| Effect | Relaxing, stimulating, creative |
| Aroma/Flavor | Sweet, fruity, musk, floral |
| Indoor yield | 400–550 g/m² (1.31–1.80 oz/ft²) |
| Outdoor yield | 50–175 g/plant (1.8–6.2 oz/plant) |
| Seed to harvest | 8 weeks from germination |
| Height | 60–120 cm (24–47 in) |
| Best cultivation technique | LST |
FAQ
Is Runtz XL Auto indica or sativa?
It is a balanced hybrid leaning slightly sativa: 47.1% Indica, 52.5% Sativa and 0.4% Ruderalis.
What are the genetics of Runtz XL Auto?
Sweet Seeds crossed a selected Runtz clone (Z x Gelato) with handpicked plants of its Sweet Gelato Auto (SWS76).
How strong is Runtz XL Auto?
THC is listed at 17–25% with about 0.5% CBD, and the effect is powerful but balanced between relaxation and creative stimulation.
How long does Runtz XL Auto take from seed to harvest?
About 8 weeks from germination, under 18/6 or 20/4 light throughout. It needs no 12/12 switch.
How much does Runtz XL Auto yield?
Indoors 400–550 g/m² (1.31–1.80 oz/ft²); outdoors 50–175 g (1.8–6.2 oz) per plant.
Do Sweet Seeds packs include free seeds?
Yes. Sweet Seeds adds free bonus seeds to its smaller packs: the 3-seed pack ships with 1 free bonus seed and the 5-seed pack ships with 2 free bonus seeds, so you get 4 or 7 seeds in total. The 25-seed pack comes without bonus seeds.
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