1100 East Delhi St
North Las Vegas, Nevada
702-399-3868

Supplying a wide range of organic and conventional products for commercial and home horticulture in the Mojave Desert 

Biologically Active Fertilizers

Biologically active fertilizers in some way influence the total biological activity of a soil and are not simply just a fertilizer. It is misleading to measure the effectiveness of these products by looking at their fertilizer content. Biologically active compounds are needed in very small quantities in soils to be effective. These fertilizers work best in aged soils that are losing their productivity or to maintain production in highly productive soils.


Humic Acid    8%    Gallon      Cold water processed                                                 


Humic acids improve the workability of soils, improve water retention while improving drainage, stimulate microbiological activity and increase plant yields. A study conducted at Ohio State University concluded that “humic acids increased plant growth” and plants had “relatively large responses at low application rates”. Humic acids are associated with the “black gold” of finished compost but they can be found elsewhere. 


Viragrow’s Humic Acid is produced from Leonardite, a mineralized form of lignin, which contains a high percentage of very stable humic acids. This may be what is needed for older soils where plants are exhibiting poor growth even when fertilizers are applied. 


Use 2 to 3 oz in 25 gallons of water.

Kelp Meal     0-0-1.5      3lb and 55 lb                                                              


Viragrow’s Kelp Meal is derived from cold water processed Norwegian kelp. Kelp Meal’s primary role is to rebuild and stimulate biological activity of soils. Kelp meal can be applied to the surface of the soil but works more rapidly when mixed into the soil prior to planting. Viragrow’s Kelp Meal is applied to vegetable crops, fruit trees and grapes, houseplants, annual and perennial flowers.


Apply 1 pound per hundred square feet in biologically inactive soils to 1 pound per 50 ft.² to sustain biological activity. Use Kelp Meal as a soil drench (tea) by mixing 1 tablespoon per gallon and allowing it to seep overnight be

Root Plex   0-1-5    2.5 gal                                                                                             


Viragrow’s Root Plex is a biologically active fertilizer derived from cold water processing of marine algae and combined with potassium, phosphate and iron nutrients.


Apply as a foliar spray or soil drench at rates of 1 to 2 ounces per gallon or 3 to 6 ounces per thousand square feet.


Make sure you use a wetting agent like EZ Wet when making foliar applications. Best results with distilled or RO water in the spray mix or adjust the spray solution to a pH of 6.5 to 7.0.

Seaweed Extract  0.1-0.1-1.5    1Pt & 1Gal       11% Kelp cold water extraction      


Seaweed extract is a biologically active fertilizer added to a general fertilizer plan for indoor and outdoor plants. Seaweed extract stimulates the biological activity of soils. Improves root development, dark green foliage and general plant and soil health. Apply any time including up to the day of harvest. Apply to the soil as a drench, foliar spray, in fertilizer injectors, for propagation or hydroponics.


Soil Drench: 4 tbs/gal every 2 to 3 months

Foliar Spray: 2 tbs/gal every month

Hydroponics: 1 tsp/gal

Houseplants: 1 tbs/gal every 2 to 3 months

Propagation: 5 oz/gal

General Purpose: 1 tbs/gal every 2 to 3 months


Make sure you use a wetting agent like EZ Wet when making foliar applications. Best results with distilled or RO water in the spray mix or adjust the spray solution to a pH of 6.5 to 7.0.