Jack Herer grow information: flowering and published seed specs

Published timing is not uniform: Leafly and Weedmaps list about 50–70 days indoors, while Sensi Seeds says its regular Jack Herer averages 10–12 weeks until harvest.^1,2,3 These are source and line specifications, not guarantees.

Published specifications side by side

Source	Type or line	Published timing	Other source statement
Sensi Seeds	Regular Jack Herer; 50% sativa / 50% indica label	10–12 weeks until harvest	Tall, early-flowering and heavy-yielding in the seller’s description³
Leafly	Jack Herer strain listing	50–70 days indoors	Four phenotypes; three usually sativa-influenced and one indica-like¹
Weedmaps	Jack Herer strain listing	50–70 days, depending on phenotype	Notes variation between phenotypes²

Seller and database specifications are not a substitute for local professional or legal guidance.

Seeds and legal context

This guide does not sell, ship or recommend seeds. CRS says the amended federal hemp definition uses total THC including THCA, and that relevant provisions will exclude viable seeds from cannabis plants above 0.3% total THC when effective.⁴

CRS says P.L. 119-103 delayed most of those provisions until December 11, 2026. State and local rules can differ, so this is background information rather than legal advice.⁴

Sources

Leafly, Jack Herer strain information. Accessed Oct 5, 2026.
Weedmaps, Jack Herer strain page. Accessed Oct 5, 2026.
Sensi Seeds, Jack Herer regular seeds. Accessed Oct 5, 2026.
Congressional Research Service, Changes to the statutory definition of hemp and implications for agricultural policy (IF13136) (2026-09-28). Accessed Oct 5, 2026.