Sweet Z XL Auto by Sweet Seeds

Sweet Z XL Auto is Sweet Seeds’ extra-large autoflowering take on Z, one of the most celebrated candy-flavored strains to come out of the US West Coast. Catalogued as SWS100, this seventh-generation automatic stacks Z genetics on both sides of the cross and delivers a loud, sweet, fruity terpene profile with floral and citrus highlights.

Sweet Seeds classes it as a “Super Strong” strain: THC sits at 17–24%, buds are compact and heavily resinous, and the whole plant finishes in around 8 weeks from germination. Plants reach 60–120 cm (24–47 in), which is tall for an auto and gives the XL label its meaning.

Yields are generous, with 450–550 g/m² (1.47–1.80 oz/ft²) indoors and 60–180 g/plant (2.1–6.3 oz/plant) outdoors. According to the breeder, Sweet Z XL Auto took a 1st Prize for strain of the year at a 2023 grower awards event in Barcelona.

Sweet Z XL Auto Genetics and Lineage

Z itself is usually traced to (Grape Ape x Grapefruit) crossed with an unknown indica. To build Sweet Z XL Auto, Sweet Seeds paired a select elite Z clone with its own Runtz XL Auto (SWS88). That autoflowering parent is Runtz (Z x Gelato) crossed with Sweet Gelato Auto (SWS76), so the Z influence runs through both halves of the family tree.

The final genetic split is 63.6% Indica, 36.2% Sativa, and only 0.2% Ruderalis. That tiny Ruderalis fraction is all it takes to make the plant flower automatically, while the rest of the genome delivers modern West Coast flavor and potency.

Aroma, Flavor, and Effect

The terpene load is high, and it shows the moment the buds are squeezed. Sweet, fruity candy notes lead the way, backed by bright citrus and a soft floral finish. It is like opening a fresh bag of fruit candy next to a vase of spring flowers, with a squeeze of citrus to sharpen the edges.

The smoke stays sweet from the first pull to the last, with citrus on the tongue and florals on the exhale. The flavor carries well through a slow cure, so patience after harvest pays off.

With 17–24% THC and around 0.2% CBD, the effect is happy, calm, and gently stimulating. A cheerful lift arrives first, then a relaxed, easy mood settles over the body without dragging the mind down. It suits social evenings, music, and laid-back weekends.

Growing Sweet Z XL Auto Indoors and Outdoors

Indoors, keep the lights on 18/6 or 20/4 for the whole cycle; no switch to 12/12 is needed. Plan for about 8 weeks from germination to harvest. Because the plant can reach 120 cm (47 in), leave some headroom in the tent and consider early LST to spread the branches and even out the canopy.

Sow the seed straight into its final pot, since autoflowers have little time to recover from transplanting. A light, airy substrate and moderate feeding are enough; the plant puts its energy into compact, resin-heavy buds during the last weeks. Good air movement through the canopy keeps the dense flowers healthy as they fatten.

Outdoors, Sweet Z XL Auto can be sown from spring through mid-summer and harvested about 8 weeks later. In full sun and a rich, well-draining mix, expect 60–180 g/plant (2.1–6.3 oz/plant). Its short cycle makes it handy for growers who want more than one harvest per season.

Sweet Z XL Auto Characteristics

Strain type	Feminized autoflowering
Variety code	SWS100
Genetics	Z elite clone x Runtz XL Auto (SWS88)
Indica/Sativa	63.6% Indica / 36.2% Sativa / 0.2% Ruderalis
THC	17–24%
CBD	0.2%
Effect	Happy, stimulating, relaxing
Aroma/Flavor	Sweet, fruity, citrus, floral
Indoor yield	450–550 g/m² (1.47–1.80 oz/ft²)
Outdoor yield	60–180 g/plant (2.1–6.3 oz/plant)
Seed to harvest	8 weeks from germination (indoors and outdoors)
Height	60–120 cm (24–47 in)
Best cultivation technique	Early LST in a single final container

FAQ