Product Name
Schrom Feminized
RKS GENETICS
ROYAL KING GENETICS
Breeder-Documented Reference Benchmark
Aggregates breeder specifications, publicly-reported third-party lab data, and grower-community results.
Not an independent ISO 17025 certificate of analysis for the specific seed lot you receive.
GENETICS REFERENCE
· STABILIZED LINE PROFILE ·
REF ID: CAN-2026-04-S-0962
CORE LINEGeneration:S1 FEMINIZED·Line:RKS Vault Selection
Phenotype:S-Pheno #1 (Diesel-Citrus)
Client / Brand
Royal King Seeds Ltd.
Strain Genetics
Sativa-Dominant Cross (80/20)
Sample ID
RKS-S-FEM-0962
Batch / Lot Number
S-2026-0962
Production Date
2026-03-20
Date Received
2026-04-16
Date of Analysis
2026-04-19, 2026-04-26
RKS Stabilized Line
S1 · Trait-Locked
Breeder Reference
Documented Line
Breeder-Selected Phenotype
S-Pheno #1 of 11
RKS BREEDER DOCUMENTATION
Batch No. S-2026-0962 · Core Line · Cycle 51
RKS Breeder Documentation
The Schrom line traces its modern stabilization through a multi-year selection program with phenotype-driven evaluation. The reference phenotype documents the terpene complexity and structural uniformity that define the upper-percentile expression of the line. The variation envelope reflects the realistic spread you can expect from seeds in this stabilized line. The line traces to a Jack Herer × Trainwreck cross, with each generation selected to fix the traits that define Schrom.
Breeding Objective · S-Pheno #1
- Stabilize potency floor at the lower bound of the THC band
- Tighten cohort variation to ≤ 12% on total cannabinoids
- Preserve aromatic identity across generations
- Maintain trichome density ≥ 28% across cohort
Royal King Genetics
Breeding Team Documentation
Reference benchmark, not a per-lot COA
Reference benchmark, not a per-lot COA
Total THC
18.0%
Total CBD
0.07%
Total Terpenes
1.53%
Safety
ALL PASS
Cannabinoid Profile
| Analyte | Distribution | Result (%) | mg/g | LOQ |
|---|---|---|---|---|
| THCa | 18.99 | 189.9 | 0.05 | |
| Δ9-THC | 1.35 | 13.5 | 0.05 | |
| CBDa | 0.00 | 0.0 | 0.05 | |
| CBD | 0.09 | 0.9 | 0.05 | |
| CBG | 0.44 | 4.4 | 0.05 | |
| CBC | 0.53 | 5.3 | 0.05 | |
| CBN | 0.22 | 2.2 | 0.05 | |
| Total THC ((THCa × 0.877) + Δ9-THC) | 18.0 | 180.0 | , |
LOQ = Limit of Quantitation. ND = Not Detected. Results reported on dry-weight basis.
Terpene Profile
| Terpene | Concentration | Result (%) | mg/g | Aroma Note |
|---|---|---|---|---|
| Limonene | 0.580 | 5.80 | Citrus, lemon | |
| Pinene | 0.440 | 4.40 | Pine, fresh forest | |
| Terpinolene | 0.300 | 3.00 | Floral, herbal | |
| Linalool | 0.160 | 1.60 | Lavender, sweet | |
| Humulene | 0.050 | 0.50 | Hoppy, woody | |
| Total Terpenes | 1.53 | 15.30 | Citrus, lemon |
Safety & Contaminant Screen
Pesticides & Plant Growth Regulators
66-analyte panel · LC-MS/MS & GC-MS/MS
Heavy Metals
Pb, Cd, As, Hg · ICP-MS
Microbial Impurities
Salmonella, STEC, Aspergillus spp. · qPCR
Mycotoxins
Aflatoxins B1, B2, G1, G2 · Ochratoxin A · LC-MS/MS
Residual Solvents
Cat I & II solvents · GC-MS Headspace
Foreign Matter
Visual + microscopic inspection
Filth & Foreign Materials
Insect frag., mammalian excreta, hair, mold
Water Activity & Moisture
aw meter · oven loss-on-drying
Quality Metrics
Moisture Content
11.1%
Water Activity (aw)
0.60
Density (g/mL)
0.38
Phenotype Consistency & Stabilization Line
Phenotype Consistency
The values reported on this Certificate reflect the top-performing phenotype(S-Pheno #1) selected from a 11-plant cohort of the RKS Schrom S1 line. Across three production cycles, individual plants from this seed line have fallen within a 10–15% variation envelope on total cannabinoids and total terpene yield when grown under comparable indoor conditions.
Note: phenotype expression is subject to environmental conditions (light, nutrients, VPD, training). These figures are not a guarantee of grow outcome.
Stabilization Status
S1 FEMINIZEDThis line has been stabilized through successive inbred generations with phenotype-driven selection. Trait-locking criteria for the S-Pheno #1 selection:
- Citrus-forward terpene expression (Limonene > 0.40%)
- Total terpenes ≥ 2.0% across cohort
- THCa ≥ 22% under standard indoor SOP
- Sativa structural uniformity · node spacing ≤ 8 cm
- Resistance to powdery mildew (visual screen)
- Flowering time variance ≤ 7 days within cohort
Expected Grow Outcomes
Flower Time
7 – 9
weeks
Yield (Indoor)
434–568
g / m²
Yield (Outdoor)
534–718
g / plant
Plant Height
134–198
cm indoor
Difficulty
Mod.
intermediate+
Reference outcomes assume standard cultivation conditions: 600–900 PPFD, VPD 1.0–1.4 kPa, mineral-fed coco substrate, 18/6 veg · 12/12 flower. Outcomes will vary with cultivator skill, environment, and phenotype selection.
Reference Method Notes
HPLC-DAD
Cannabinoid potency by reverse-phase HPLC with diode array detection. SOP-CAN-101 Rev 4.
GC-FID Headspace
Terpene quantification · 38-analyte target list. SOP-TER-204 Rev 2.
LC-MS/MS & GC-MS/MS
Pesticide and mycotoxin screening with QuEChERS prep. SOP-PES-310 Rev 5.
ICP-MS
Heavy metals (Pb, Cd, As, Hg) digested via microwave HNO₃. SOP-MET-115 Rev 3.
qPCR Microbiology
PathoSEEK® assay for Salmonella, STEC, and Aspergillus. SOP-MIC-401 Rev 2.
GC-MS Headspace (Solvents)
Cat I & II residual solvents per USP <467>. SOP-RSV-220 Rev 3.
Laboratory Authorization
Royal King Genetics Lab Team
Royal King Genetics Lab Team
Quality Analysis Team
Royal King Genetics QA
Royal King Genetics QA
Quality Assurance Lead
Disclaimer of variation · Results published in this Certificate represent a selected phenotype of the RKS Schrom S1 stabilized line under controlled indoor conditions. Individual seedlings may produce plants that vary by approximately 10–15% on total cannabinoids and terpene output, and may express alternate phenotypes within the line. Final cannabinoid and terpene expression is subject to cultivator inputs, lighting, substrate, nutrient regime, environment, and training technique. This document is intended as a reference benchmark of the genetic potential of the RKS Schromline, not as a guarantee of any individual plant’s outcome.
Note for seed buyers · This Certificate analyzes mature, cured flower from a selected reference plant cultivated by the RKS breeding team under controlled conditions. Seed-grown plants may vary slightly from the tested phenotype depending on environment, nutrient regime, and grower input. For best expression of the S-Pheno #1profile, follow the cultivation reference outlined in the “Expected Grow Outcomes” section above.
Note for seed buyers · This Certificate analyzes mature, cured flower from a selected reference plant cultivated by the RKS breeding team under controlled conditions. Seed-grown plants may vary slightly from the tested phenotype depending on environment, nutrient regime, and grower input. For best expression of the S-Pheno #1profile, follow the cultivation reference outlined in the “Expected Grow Outcomes” section above.