Research Trial Results


Persist™ PAF produces 72% greater new root growth and a 31% increase in plant weight in celery nursery trial.

  • Outdoor nursery trial conducted January-March 2023 by Holden Research and Consulting (Ventura County, California, U.S.A.).
  • Two foliar applications of PAF were applied, evaluating six different concentrations, with 0.5% to 0.25% (1:200-400) providing the best results.
  • The trial interval was 30 days, with appropriate data collected throughout the trial.

Persist™ PAF and Biochar provide a

14% yield increase in

marketable strawberries per acre.

* Extrapolated flats per acre compared to the grower’s standard.

      • Outdoor production trial conducted by Holden Research and Consulting (Ventura County, California, U.S.A.); September – December 2022
      • Completely randomized data collection of six replicates. A Portola variety was grown.
      • Before planting, Persist™ Biochar was placed in the slot at a rate of 480 lbs/acre. Persist™ PAF liquid was applied at 1% dilution with a backpack sprayer at a total rate of 3.5 gal/acre (four applications total).
      • At planting, all treatments received controlled release fertilizer and in-season applications of nitrogen and phosphorous, along with foliar pest control.
Hand Touching Soil

Persist™ Biochar-based grow media improves cannabis flower yields by 17-60% compared to coco coir.

  • Cannabis Indoor Grow Media Trial (Oct-Dec 2019) – Conducted in partnership with MedMen.
  • Persist’s 10% Biochar/Coco grow media was evaluated against 100% Coco Coir and Rockwool grow media (control). The trial included over 1,000 plants.
  • For the Tangie Dream strain, Persist’s Biochar/Coco media produced 200% more flowers (g/sq ft) than Rockwool and 17% compared to 100% coco grow media.
  • For the Blue Dream strain, Persist produced 117% greater yield than Rockwool and 60% compared to Coco Coir alone.

Persist™ Biochar holds water in soil

up to six times longer.

      • VGrid internal trial conducted July 2020.
      • Geraniums were planted in two self-watering pots, then top-watered and filled.
      • After 15 days, the water level indicator in the non-biochar planter dropped significantly but remained virtually unchanged in the biochar-amended (20%) planter, even after 30 full days of no water.
      • After 49 days of no additional watering, the flowers in the biochar-amended pot were still in bloom, and the leaves were green and healthy. However, the flowers in the non-biochar pot had died.
Hand Touching Soil

Contact Us to Learn More

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+1 (805) 482-9040
513 Calle San Pablo, Camarillo, CA 93012


Persist™ all-natural biochar and PAF liquid plant enhancer are manufactured by VGrid Energy Systems, a California-based clean energy producer