Growing
Growing Watermelon Z: flowering time, yield and breeder specs
Seed versions of Watermelon Zkittlez flower in about 60–63 days indoors, and Weedmaps gives 8–9 weeks; outdoors they finish between late September and mid-October.1,2,3,4,5,6 Expect a bushy plant of medium height; sources rate it easy to moderate to grow.4,5
Breeder specs side by side
| Source and version | Flowering | Indoor yield | Outdoor | Difficulty |
|---|---|---|---|---|
| Barney’s Farm, feminized (Watermelon × Zkittlez; via SeedFinder) | About 63 days | 550 g/m²; 120–140 cm | 750–1,000 g per plant; 140–200 cm; end of September1 | — |
| Zamnesia, listing for Barney’s Farm’s seeds (out of stock) | 8–9 weeks | Up to 19.4 oz/m²; 4.6 ft | Up to 30 oz per plant; 6.6 ft; late September or early October5 | Easy5 |
| Barney’s Farm, autoflower (× BF Super Auto #1; via SeedFinder) | About 70 days from seed to harvest | 550 g/m²; 120–140 cm | 140 cm tall7 | — |
| Pyramid Seeds, feminized (Watermelon Zum Zum #3 × OG Eddy; via SeedFinder) | 60 days | 400+ g/m² under a 600 W light | 0.75–1 kg per plant; September in Europe2 | — |
| Big Head Seeds, feminized (Zkittlez × Watermelon; via SeedFinder) | About 60 days (9 weeks in its spec list) | Medium-high | High; mid-October3 | — |
| Purple City Genetics, feminized S1 (via SeedFinder) | 8–9 weeks | — | October harvest6 | — |
| Weedmaps (strain page) | 8–9 weeks | Up to 550 g/m²; 120–140 cm | Up to 1,000 g per plant; up to 200 cm4 | Moderate4 |
Seed-company figures are the sellers’ own claims, and the seed lines do not all share the same parents. Weedmaps’ height and yield figures are the same as Barney’s Farm’s.1,2,4
What the plant is like
Weedmaps describes a bushy, indica-leaning plant with solid lateral branching, and Weedmaps and AllBud describe heart-shaped, dark olive-green buds with purple undertones, sparse orange hairs and purple-tinted white trichomes.4,8 Big Head Seeds says its version has dark green leaves and flowers under a white coat of resin, with medium-high density buds suited to resin extraction; Purple City Genetics describes dense buds with an impressive resin layer.3,6
What to watch for
Difficulty is disputed. Zamnesia calls Barney’s Farm’s version easy enough for novices, Weedmaps rates the strain moderate, and Leafly rates its parent The Original Z medium to difficult.4,5,9 The bigger variable is the seed line: Barney’s Farm and Big Head Seeds sell Zkittlez × Watermelon crosses, while Pyramid Seeds and Purple City Genetics trace theirs to Watermelon Zum Zum #3 × OG Eddy, and they describe different plants.1,2,3,6 Weedmaps recommends a warm, Mediterranean climate, 70–80°F in the daytime.4
Seeds and the law in the US
Under the amended federal definition of hemp, viable seeds from cannabis plants above 0.3% total THC, including THCA, are not hemp.10 Congress delayed that exclusion, with most of the new definition, from Nov 12 to Dec 11, 2026; only the exclusion of products with cannabinoids the plant cannot produce naturally starts on Nov 12.11 Home cultivation rules are set by each state. This site does not sell seeds.
Sources
- SeedFinder, Watermelon Zkittlez (Barney’s Farm): strain info and breeder description. Accessed Oct 4, 2026.
- SeedFinder, Watermelon Zkittlez (Pyramid Seeds): strain info and breeder description. Accessed Oct 4, 2026.
- SeedFinder, Watermelon Zkittlez (Big Head Seeds): strain info and breeder description. Accessed Oct 4, 2026.
- Weedmaps, Watermelon Zkittlez (aka Wmz, Watermelon Skittles, Watermelon Z) strain page. Accessed Oct 4, 2026.
- Zamnesia, Watermelon Zkittlez (Barney’s Farm) feminized. Accessed Oct 4, 2026.
- SeedFinder, Watermelon Zkittlez (Purple City Genetics): strain info and breeder description. Accessed Oct 4, 2026.
- SeedFinder, Watermelon Zkittlez Auto (Barney’s Farm): strain info and breeder description. Accessed Oct 4, 2026.
- AllBud, Watermelon Zkittlez marijuana strain information and reviews. Accessed Oct 4, 2026.
- Leafly, The Original Z (aka Z) strain information. Accessed Oct 4, 2026.
- Congressional Research Service, Changes to the statutory definition of hemp and implications for agricultural policy (IF13136) (2026-09-28). Accessed Oct 4, 2026.
- U.S. Government Publishing Office, Continuing Appropriations and Extensions Act, 2027 (P.L. 119-103), sec. 2019. Accessed Oct 4, 2026.