Growing
Growing Purple Haze: flowering time, yield and breeder specs
Most seed versions of Purple Haze flower in about 50–70 days indoors and Leafly gives 7–9 weeks, while ACE Seeds’ pure-sativa line and Weedmaps’ listing take 16–20 weeks. Outdoors, most seed lines finish between the third week of September and October, and ACE Seeds’ in December or January. Expect a tall, stretchy plant: High Times rates it moderate to grow, Leafly and ILGM easy.1,2,3,4,5,6,7,8,9,10
Breeder specs side by side
| Source and version | Flowering | Indoor yield | Outdoor | Difficulty |
|---|---|---|---|---|
| ILGM, feminized (SeedFinder listing) | 63 days | 450 g/m²; tall | October harvest1 | Easy; Beginner on ILGM’s own page1,10 |
| Zamnesia, feminized (SeedFinder listing) | 65–70 days (9–10 weeks) | High; about 160 cm | Usually ready in October; about 200 cm2 | — |
| United Cannabis Seeds, feminized (SeedFinder listing) | About 64 days | — | Indoors or outdoors11 | — |
| G13 Labs, feminized, Afghani × Haze (SeedFinder listing) | 50–65 days | Medium-high; “not too tall” | Early October harvest3 | — |
| White Label, feminized (SeedFinder listing) | 50–65 days | Up to 150 g; 110–150 cm | Indoors or outdoors4 | — |
| Growers Choice, never sold feminized (SeedFinder listing) | 50–55 days | 450 g/m²; 200 cm | Third week of September5 | — |
| ACE Seeds, pure sativa, never sold feminized (SeedFinder listing) | 16–20 weeks (126 days) | Medium-low | December–January; tropical or subtropical climate7 | — |
| High Times (strain profile) | 9–10 weeks | Medium–high; tall | Typically October for modern seed lines9 | Moderate9 |
| Leafly (strain page) | 7–9 weeks | High; average height | Ideal for sunny, Mediterranean climates6 | Easy6 |
| Weedmaps | 16–20 weeks indoors8 | — | — | — |
Seed-company figures are the sellers’ own claims.
What the plant is like
Expect a tall, vigorous plant that stretches. High Times describes long branches and a noticeable stretch and recommends height control indoors; Zamnesia advises topping, defoliation and about a week less vegetative growth indoors, and lists heights of about 160 cm indoors and 200 cm outdoors; ILGM rates its plants tall.1,2,9 G13 Labs’ Afghani × Haze version is the exception, described as not too tall, with long, dense buds.3
The flowers are long and resinous: AllBud describes long, dense, pepper-shaped buds in light minty green with purple undertones and purple hairs, High Times elongated, resinous flowers, and Weedmaps deep green flowers that can flash purple and violet under a heavy coat of trichomes.8,9,12 G13 Labs says the smell stays subtle while growing and turns rich and sharp after drying.3
What to watch for
Climate matters most for the long-flowering lines. ACE Seeds says its pure sativa needs a tropical or subtropical climate and medium-low nitrogen, and rates it highly resistant to botrytis but only medium against mildew and medium-low against spider mites.7 Leafly calls Purple Haze ideal for sunny, Mediterranean climates, and Growers Choice says its version was specially developed to withstand poor weather.5,6
Getting the purple
Purple in cannabis comes from anthocyanins, pigments whose potential is set by a plant’s genetics; cooler conditions let the purple show as chlorophyll fades, and Leafly notes that a purple plant exposed to cold may produce less THC.13
Purple Haze’s sellers say the same: ILGM’s listing says the purple intensifies with cooler temperatures in the final weeks, and G13 Labs and White Label mention lavender or violet hues in cool late flowering. High Times suggests modestly cooler nights and adds that the color depends on the phenotype and is not guaranteed.1,3,4,9
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.14 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 12.15 Home cultivation rules are set by each state. This site does not sell seeds.
Sources
- SeedFinder, Purple Haze (ILGM): strain info. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (Zamnesia): strain info. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (G13 Labs): strain info. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (White Label): strain info. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (Growers Choice): strain info. Accessed Oct 4, 2026.
- Leafly, Purple Haze strain information. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (ACE Seeds): strain info. Accessed Oct 4, 2026.
- Weedmaps, Purple Haze strain page. Accessed Oct 4, 2026.
- High Times, Purple Haze: High Times strain profile (2026-08-05). Accessed Oct 4, 2026.
- ILGM, Purple Haze feminized seeds. Accessed Oct 4, 2026.
- SeedFinder, Purple Haze (United Cannabis Seeds): strain info. Accessed Oct 4, 2026.
- AllBud, Purple Haze marijuana strain information and reviews. Accessed Oct 4, 2026.
- Leafly, How does cannabis get its color? Here's why some strains turn purple (Bailey Rahn) (2020-07-28). 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.