Jack 47 XL Auto by Sweet Seeds

Jack 47 XL Auto is the tall-stemmed version of Jack 47 Auto, one of the most appreciated autoflowers Sweet Seeds has bred. It is a strongly Sativa-dominant plant that finishes in about 9 weeks from germination.

The XL line came from a recurrent selection program that, over several generations, kept only the tallest and most productive Jack 47 Auto specimens. The result keeps powerful hybrid vigor and ranks among the heaviest producers in the auto range.

Plants reach 65–130 cm (26–51 in), and yields match that stature: 475–600 g/m² (1.56–1.97 oz/ft²) indoors and 60–200 g (2.1–7.1 oz) per plant outdoors. Compact buds are wrapped in strongly aromatic resin.

THC sits at 18–21%, and Sweet Seeds describes it as probably one of the most powerful autoflowers on the market. It is a clear pick for growers who want an energetic, creative Sativa high on an auto timeline.

Lineage: Selecting Jack 47 Auto for Size

Jack 47 Auto (SWS31) was already a favorite for its speed and heady effect. Rather than adding new parents, Sweet Seeds bred the tallest, highest-producing plants together generation after generation to stretch the stem and enlarge the harvest.

The genetic balance stays at 20% Indica, 76.9% Sativa and 3.1% Ruderalis. That makes Jack 47 XL Auto one of the more Sativa-heavy autoflowers available, with longer internodes and a lively, uplifting character.

Aroma, Flavor and Effect

The aroma is sweet and fresh, led by bright lemony citrus. Beneath it sits a soft, smoky touch of incense that gives the bouquet an almost temple-like depth.

Smoke tastes clean and zesty on the inhale, with the incense note lingering on the exhale. It is like lemon peel twisted over a burning stick of sandalwood: fresh, aromatic and a little mysterious.

The effect is stimulating and psychoactive, with a clear creative streak. Thoughts move quickly, music and conversation feel more vivid, and the body stays light. It suits daytime projects and social plans more than winding down.

Growing Jack 47 XL Auto Indoors and Outdoors

There is no photoperiod switch to plan: keep the lamps on 18/6 or 20/4 from sprout to harvest, around 9 weeks in total. Sow straight into a final pot of roughly 11–20 liters (3–5 gallons).

Indoors, the 65–130 cm (26–51 in) Sativa stretch fills a tent quickly. Bend the main stem in week three and spread side branches under a net to keep tops level. Expect 475–600 g/m² (1.56–1.97 oz/ft²) with strong light and steady feeding.

Outdoors, give it full sun and loose, well-draining soil. Plants usually return 60–200 g (2.1–7.1 oz) per plant. In warm regions the short cycle allows two sowings per season.

Jack 47 XL Auto Characteristics

Strain type	Autoflowering (feminized)
Variety code	SWS78
Genetics	Recurrent selection of tall, high-yielding Jack 47 Auto (SWS31) plants
Indica/Sativa	20% Indica / 76.9% Sativa / 3.1% Ruderalis
THC	18–21%
CBD	0.1%
Effect	Stimulating, psychoactive, creative
Aroma/Flavor	Sweet, fresh, citrus, lemon, incense
Indoor yield	475–600 g/m² (1.56–1.97 oz/ft²)
Outdoor yield	60–200 g/plant (2.1–7.1 oz/plant)
Seed to harvest	About 9 weeks from germination (indoors and outdoors)
Outdoor harvest	Roughly 9 weeks after sowing; plant from late spring to midsummer
Height	65–130 cm (26–51 in)
Best cultivation technique	LST and SCROG-style canopy spreading

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