Strain Reference Library
Jack Herer
Aliases: Jack
Sample reference data — not plant-specific advice
This profile supplies a starting hypothesis. Your plant's logs, stage, medium, source-labeled sensors, and observed response remain authoritative.
- Breeder/source
- Sensi Seeds
- Life cycle
- Photoperiod
- Seed expression
- Regular
- Reported flower window
- 8–10 weeks reported
- Reported THC
- 18–24% reported
- Reported CBD
- Information limited
- Guide version
- v1
- Last verified
- Jul 22, 2026
Jack Herer is a long-circulating name associated with spicy, pine, herbal, and terpinolene-forward reports. Seed releases and phenotypes can differ, so Verdant emphasizes provenance and matched comparison.
Reported lineage: Commonly reported as Haze × Northern Lights #5 × Shiva Skunk
Overview
medium confidenceUse this profile as reference context, then verify every tendency against the plant in front of you.
Reported tendencies
Spicy, pine, herbal, and complex terpinolene-associated descriptors are commonly reported.
medium confidence · 1 evidence reference
Cautious guidance
- Start with the actual stage, medium, pot size, logs, photos, and source-labeled sensor history.Risk: low
Cautions
- Do not convert a named-cultivar profile into a universal recipe.
Information limited
- Breeder release, phenotype, and batch identity may be incomplete or disputed.
- This directional tendency must be checked against the specific release, phenotype, and run.
Germination
medium confidenceGermination fundamentals are shared and are not a reliable cultivar-selection signal.
Cautious guidance
- Keep moisture and temperature stable and minimize handling once the seed is placed.Risk: low
Cautions
- Do not infer vigor or final quality from germination speed alone.
Information limited
- Cultivar-specific germination evidence is usually limited.
Early growth
medium confidenceEvaluate early growth through stability, root-zone correctness, and observation.
Cautious guidance
- Record emergence, leaf development, watering, and deviations before changing inputs.Risk: low
Cautions
- Avoid chasing small early differences with heavy feeding or stress.
Information limited
- Reliable cultivar-specific early-growth trials are limited.
Vegetative growth
medium confidenceVegetative structure can vary among phenotypes carrying the same commercial name.
Reported tendencies
Vigorous vertical growth and branching are frequently described.
medium confidence · 1 evidence reference
Cautious guidance
- Log internode spacing, branching, vigor, and recovery from low-risk handling.Risk: low
Cautions
- Do not assume market classification predicts structure or nutrient demand.
Information limited
- Matched-environment replication is usually missing.
- This directional tendency must be checked against the specific release, phenotype, and run.
Flowering
medium confidenceReported timing is directional and should be checked against observed maturity.
Reported tendencies
Phenotypes may differ in finish and structure, making matched timepoint comparison important.
medium confidence · 1 evidence reference
Cautious guidance
- Track first flower, stretch, resin, aroma, and finish cues in the timeline.Risk: low
Cautions
- Do not harvest on a catalog day number alone.
Information limited
- Sources may not define flowering day one or maturity criteria.
- This directional tendency must be checked against the specific release, phenotype, and run.
Environment
medium confidenceEnvironmental stability matters more than a copied cultivar-name target.
Cautious guidance
- Derive VPD only from validated temperature and humidity, then compare it with stage and response.Risk: low
Cautions
- Never present stale, invalid, demo, or mis-unit telemetry as healthy.
Information limited
- Controlled cultivar response curves are rarely available.
Watering
medium confidenceWatering depends on medium, root mass, container, environment, and dryback.
Cautious guidance
- Log volume, timing, substrate response, and plant response before changing cadence.Risk: low
Cautions
- Do not use uncalibrated soil-moisture percentages as absolute instructions.
Information limited
- Cultivar-specific root-zone calibration is generally unavailable.
Nutrition
medium confidenceFeeding descriptions are weak evidence without medium, water, EC, and response context.
Cautious guidance
- Begin moderately and adjust from measured input and plant response.Risk: low
Cautions
- Do not copy an exact nutrient dose from a reference profile.
Information limited
- Comparable nutrient-response trials are usually missing.
Training
medium confidenceTraining response depends on vigor, health, timing, phenotype, and lifecycle.
Reported tendencies
Early low-stress canopy planning may help manage stretch when vigor is strong.
medium confidence · 1 evidence reference
Cautious guidance
- Use low-stress structure management and record recovery before increasing intensity.Risk: low
Cautions
- Avoid high-stress work when health or environmental stability is uncertain.
Information limited
- Controlled cultivar-specific training trials are limited.
- This directional tendency must be checked against the specific release, phenotype, and run.
Common issues
medium confidenceIssue lists are hypotheses; symptoms still require plant and environment context.
Cautious guidance
- Document symptoms, recent actions, photos, root-zone context, and telemetry.Risk: low
Cautions
- Do not diagnose a deficiency or prescribe feed from cultivar identity alone.
Information limited
- Frequency and causal evidence for cultivar-specific problems is limited.
Harvest
medium confidenceHarvest timing should reflect observed maturity and intended use.
Cautious guidance
- Record trichomes, aroma, fade, irrigation history, and the harvest rationale.Risk: low
Cautions
- Do not treat reported potency or flowering time as a guaranteed endpoint.
Information limited
- Sources may not define sample position or maturity criteria.
Post-harvest
medium confidenceDrying, curing, and storage can change aroma retention and measured chemistry.
Cautious guidance
- Record dry conditions, duration, cure observations, and final quality notes.Risk: low
Cautions
- Do not close a keeper decision before post-cure evidence exists.
Information limited
- Comparable post-harvest protocols and laboratory methods are often absent.
Pheno tips
medium confidenceNamed cultivars can express different structure, aroma, chemistry, and finish.
Reported tendencies
Record terpinolene/pine direction and finish timing across replicated candidates.
medium confidence · 1 evidence reference
Cautious guidance
- Compare matched timepoints and record structure, vigor, resistance, aroma, resin, and post-cure notes.Risk: low
Cautions
- A single attractive specimen is not proof of stability.
Information limited
- Replication count and environment matching may be unknown.
- This directional tendency must be checked against the specific release, phenotype, and run.
Missing information
medium confidenceUncertainty stays visible so a thin record never reads like certainty.
Cautious guidance
- Use missing-information notes to decide what to observe, measure, photograph, or source next.Risk: low
Cautions
- Do not fill missing evidence with invented values or AI-generated certainty.
Information limited
- Batch COAs, methods, phenotype identity, and matched trials are commonly absent.
Pheno comparison — sample
Sample data — not real grower diaryIllustrative side-by-side of two Jack Herer phenos to show how Verdant lays evidence out during a Pheno Hunt. Real runs use your own source-labeled logs, photos, and sensor snapshots — Verdant organizes the evidence; the breeder decides the keeper.
Run this as a real Pheno Hunt in Verdant
Diary each pheno day-by-day, attach source-labeled sensor snapshots, and let Verdant surface the differences. Nothing is auto-selected; nothing touches your equipment.
Common questions about Jack Herer
- How long does Jack Herer take to flower?
- 8–10 weeks reported. Treat this as a reported range, not a fixed schedule — the real finish depends on the phenotype, your environment, and trichome/maturity checks rather than a calendar.
- What is Jack Herer's reported lineage?
- Commonly reported as Haze × Northern Lights #5 × Shiva Skunk. Lineage for widely circulated names is often reported or disputed rather than verified, so Verdant keeps it as sourced context, never a genotype guarantee.
- Who is the reported breeder or source of Jack Herer?
- Sensi Seeds, per the sources on this page. A named source does not make every seed or cut identical — confirm provenance for your specific plant.
- Is Jack Herer suitable for beginners?
- Public reports describe it as intermediate to grow, and it is commonly run as a photoperiod plant. Difficulty varies with your setup and experience, so use this as a rough prior, not a promise.
- Will this Jack Herer profile predict how my plant turns out?
- No. It is a starting hypothesis drawn from public sources. Your plant's own logs, stage, medium, source-labeled sensors, and observed response stay authoritative — a reference page never creates an alert, a nutrient or irrigation action, or any guaranteed result.
Track Jack Herer in your own grow
A linked reference may provide context later, but Verdant will keep the plant's actual logs and sensors in charge. Reference pages never create alerts, nutrient actions, irrigation actions, or equipment commands.