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Watermelon Z Auto seed pack
AutoflowerTHC 26%Sativa 40%/Indica 60%

Watermelon Z Auto

Fruit-forward autoflower finishing in just 10 weeks

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Our take

Watermelon Z Auto is a heavily indica-leaning (60%) autoflower from Fast Buds, bred from Watermelon Z and BF Super Auto #1. It reaches up to 26% THC while delivering a layered aroma of watermelon, berry, candy, and tropical fruit. The automatic flowering cycle suits beginners who want impressive results without managing light schedules, and intermediate growers chasing serious yields.

Seed to harvest in 10 weeks — no light-schedule change required
Outdoor yields of 21–24 oz per plant from an XXL-sized autoflower
Rich watermelon, berry, and candy aroma from a high-potency 26% THC variety

Grow specs

GenotypeSativa 40%/Indica 60%
THC26%
Taste & aromaWatermelon, Berry, Candy, Tropical
CBD< 1%
ClimateIndoor/Outdoor/Greenhouse/Mixlight
Total cycle (auto)10 weeks
Yield (indoor)1.5 – 1.8 oz/ft2
Yield (outdoor)21 – 24 oz/plant
Size classXXL
Plant height47 – 55 inches
LineageWatermelon Z x BF Super Auto #1

Specs are Fast Buds's published figures for this product; catalog and pricing last verified August 2026. Our write-up is our own — see how we make money.

Growing notes

Watermelon Z Auto runs a full seed-to-harvest cycle in 10 weeks and performs well indoors, outdoors, in a greenhouse, or under mixed light — making it one of the more versatile autoflowers in Fast Buds' catalog. Expect plants to finish between 47 and 55 inches tall (XXL for an auto), so give them room. Indoor yields run 1.5–1.8 oz/ft², while outdoor plants can reach 21–24 oz each under good conditions.

New to growing? Start with the complete guide, plan your gear with tent setups, and diagnose problems with troubleshoot.

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