Strain Reference Library
Sour Stomper
Aliases: Sour Stomper Auto
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
- Mephisto Genetics
- Life cycle
- Autoflower
- Seed expression
- Feminized
- Reported flower window
- 65–75 days from sprout reported
- Reported THC
- 18–24% reported
- Reported CBD
- Information limited
- Guide version
- v1
- Last verified
- Jul 22, 2026
Sour Stomper is the V1 autoflower reference. Breeder-reported timing and aroma are directional context, while recovery, watering, environment, and gentle training decisions stay tied to the actual plant.
Reported lineage: Breeder-reported Grapestomper OG × Sour Crack
Overview
medium confidenceUse this profile as reference context, then verify every tendency against the plant in front of you.
Reported tendencies
Breeder material describes a sour fruit/grape and candy-associated aroma direction.
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.
Reported tendencies
Autoflower timing makes stable early root-zone and environment conditions especially important.
medium confidence · 1 evidence reference
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.
- This directional tendency must be checked against the specific release, phenotype, and run.
Vegetative growth
medium confidenceVegetative structure can vary among phenotypes carrying the same commercial name.
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.
Flowering
medium confidenceReported timing is directional and should be checked against observed maturity.
Reported tendencies
A 65–75 day from-sprout range is breeder-reported and is not a guaranteed harvest date.
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
Gentle low-stress canopy support is preferable to repeated high-stress recovery demands.
medium confidence · 1 evidence reference
Cautious guidance
- Use gentle low-stress canopy support only while the plant is healthy and actively growing.Risk: low
Cautions
- Avoid high-stress training, heavy defoliation, transplant shock, and repeated recovery demands on an autoflower.
Information limited
- Controlled cultivar-specific training trials are limited.
- Controlled breeder-specific recovery trials are not available in this sample reference.
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
Compare sour fruit, grape/candy direction, structure, and finish without assuming one fixed expression.
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 Sour Stomper 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 Sour Stomper
- How long does Sour Stomper take to flower?
- 65–75 days from sprout 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 Sour Stomper's reported lineage?
- Breeder-reported Grapestomper OG × Sour Crack. 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 Sour Stomper?
- Mephisto Genetics, per the sources on this page. A named source does not make every seed or cut identical — confirm provenance for your specific plant.
- Is Sour Stomper suitable for beginners?
- Public reports describe it as beginner-friendly to grow, and it is commonly run as an autoflower. Difficulty varies with your setup and experience, so use this as a rough prior, not a promise.
- Will this Sour Stomper 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 Sour Stomper 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.