Growing
Growing G13 Haze: flowering time, yield and breeder specs
Barney’s Farm gives its G13 Haze 65–70 days of flowering for feminized seeds and 65–75 for regular ones, with 500–600 g/m² indoors and a plant that stays compact for a Haze; the Mr Nice and Soma versions take 9–12 weeks. Breeders rate it for experienced growers.1,2,3,4
Breeder specs side by side
| Source and version | Flowering | Indoor yield | Outdoor | Difficulty |
|---|---|---|---|---|
| Barney’s Farm, feminized | 65–70 days | 500–600 g/m²; 100–110 cm tall | Harvest October, 2nd–3rd week; 800 g per plant; 120–150 cm1 | Moderately challenging; for experienced growers1 |
| Barney’s Farm, regular | 65–75 days | 600 g/m²; 100–110 cm tall | 800 g per plant; 150–180 cm2 | — |
| Barney’s Farm, older description (via SeedFinder) | 10–11 weeks | “Healthy yields”; medium-short and compact; suits SOG and ScrOG | Mid-October5 | — |
| SeedFinder growers, Barney’s line (10 reviews) | About 74 days | Very high; hard, compact buds | High yield5 | — |
| Mr Nice Seedbank, regular (Nevil and Shantibaba) | 9–11 weeks | 500–750 g/m² | November to early December in the Northern Hemisphere3 | Experienced growers; “hard” per the retailer Zamnesia3,6 |
| Soma Seeds, regular | About 84 days | — | Listed for indoor growing4 | — |
Seed-company figures are the sellers’ own claims. GrowDiaries lists 73 grow diaries and 27 recorded harvests for the strain.7
What the plant is like
Expect a plant that is short for a Haze. Barney’s Farm says its G13 Haze “remains surprisingly compact and manageable”, about 100–110 cm indoors, with “incredibly dense and heavy” resinous buds, and its older description recommended sea-of-green and screen-of-green setups.1,2,5 Growers on SeedFinder report hard, compact buds and three phenotypes, from long and sativa-dominant to short and indica-dominant; Barney’s sells regular seeds as a breeder’s choice for isolating such phenotypes.2,5
What to watch for
The sativa phenotypes. Mr Nice says different phenotypes of its version need different EC levels and that the more sativa expressions should not be fed high EC, and Zamnesia adds that they may need the full 11 weeks of flowering; Barney’s Farm calls its own version moderately challenging and suited to experienced growers.1,3,6 For the parent G13, Leafly’s sponsored grow guide describes a heavy feeder that tolerates cooler fall weather better than most plants.8
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.9 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 12.10 Home cultivation rules are set by each state. This site does not sell seeds.
Sources
- Barney’s Farm, G13 Haze: feminized seed specifications. Accessed Oct 3, 2026.
- Barney’s Farm, G13 Haze: regular seed specifications. Accessed Oct 3, 2026.
- SeedFinder, G13 Haze (Mr Nice Seedbank): strain info and breeder description. Accessed Oct 3, 2026.
- SeedFinder, G13 Haze (Soma Seeds): strain info, breeder description and hybrids. Accessed Oct 3, 2026.
- SeedFinder, G13 Haze (Barneys Farm): strain info, breeder description, awards and grower reviews. Accessed Oct 3, 2026.
- Zamnesia, G13 Haze (Mr. Nice) regular seeds. Accessed Oct 3, 2026.
- GrowDiaries, G13 Haze grow diaries and strain stats. Accessed Oct 3, 2026.
- Leafly, Tips for growing G13 cannabis (presented by Advanced Nutrients) (2017-06-30). Accessed Oct 3, 2026.
- Congressional Research Service, Changes to the statutory definition of hemp and implications for agricultural policy (IF13136) (2026-09-28). Accessed Oct 3, 2026.
- U.S. Government Publishing Office, Continuing Appropriations and Extensions Act, 2027 (P.L. 119-103), sec. 2019. Accessed Oct 3, 2026.