Grow More® Mendocino Myco Grow Mycorrhizal Inoculant — 25 lb

8-Species Mycorrhizal Inoculant with Humic Acid for Dramatically Enhanced Root Systems and Crop Performance

Grow More® Mendocino Myco Grow is a comprehensive multi-species mycorrhizal inoculant containing 8 species of both endomycorrhizal and ectomycorrhizal spores that establish a powerful symbiotic relationship with plant roots. This symbiotic association effectively extends the plant’s root system by the equivalent of several miles, dramatically increasing the surface area available for nutrient and water absorption and delivering measurable improvements in plant performance that last throughout the entire crop cycle. Enriched with 1.0% humic acid from Leonardite to support the establishment of mycorrhizal colonies, Myco Grow is the foundation of a biologically driven growing program.

Key Features & Benefits

• 8 Mycorrhizal Species: Contains 3 endomycorrhizal (VAM) species — Glomus intraradices, Glomus aggregatum, and Glomus mosseae — and 5 ectomycorrhizal species — Suillus granulatus, Pisolithus tinctorius, Rhizopogon rubescens, Scleroderma cepa, and Scleroderma citrinum — for broad-spectrum colonization across a diverse range of plant species.
• Expands Effective Root System: The mycorrhizal network formed between spores and host plant roots extends the effective root system equivalent to several miles, accessing nutrients and water far beyond the range of the plant’s own roots alone.
• Enhances Nutrient and Water Uptake Efficiency: The expanded hyphal network is particularly effective at accessing phosphorus, zinc, copper, and water in soil microsites too distant or too physically restricted for root hairs to reach.
• Improves Disease Resistance: Mycorrhizal colonization strengthens the plant’s immune response through a phenomenon known as mycorrhizal-induced resistance (MIR), improving tolerance to soil-borne pathogens and environmental stressors.
• 1.0% Humic Acid (Leonardite): Included to support the establishment and proliferation of mycorrhizal colonies in the rhizosphere by providing a carbon-rich substrate for mycorrhizal fungi and associated soil biology.
• Foundation for Secondary Nutrients: The mycorrhizal symbiosis provides the plant with access to nitrogen, potassium, calcium, and trace elements stored in soil organic matter beyond what synthetic fertilization alone can supply.

Who Should Use This

Myco Grow is an essential component of any biologically oriented growing program — from large-scale commercial field production to high-performance indoor cultivation. It is particularly valuable at transplant, when establishing new plantings, and whenever growers want to reduce synthetic fertilizer dependence while maintaining or improving crop yields and plant health.

Compatibility

Apply Myco Grow at transplant by incorporating it into the transplant hole, planting mix, or root zone. For best results, ensure direct contact between spores and the plant’s root surface. Avoid combining with systemic fungicides that could inhibit mycorrhizal establishment. Compatible with Grow More’s full line of fertilizers and supplements when used at recommended rates.

Frequently Asked Questions

What is the difference between endomycorrhizae and ectomycorrhizae?

Endomycorrhizal fungi (including the Glomus species in Myco Grow) penetrate the root cell walls and form structures called arbuscules and vesicles inside root cells, creating an intimate nutrient exchange interface. Ectomycorrhizal fungi form a sheath around the outside of the root without penetrating cells. Different plant species have evolved symbiotic relationships with one type or the other, and Myco Grow’s 8-species blend ensures compatibility with the broadest possible range of host plants.

How long does it take for mycorrhizal colonization to establish?

Under favorable conditions, mycorrhizal colonization can begin within days of spore-to-root contact and become functionally established within 2–4 weeks. The benefits — improved nutrient uptake, enhanced stress tolerance, and expanded root reach — typically become visible as increased vigor and growth rate within 3–6 weeks of inoculation.

Will synthetic fertilizers harm mycorrhizal fungi?

Very high concentrations of soluble phosphorus can suppress mycorrhizal colonization, as plants with abundant available phosphorus have less incentive to maintain the symbiotic relationship. Using phosphorus-containing fertilizers at moderate, crop-appropriate rates while avoiding excessive over-fertilization allows mycorrhizal colonies to thrive alongside a conventional fertilizer program.

Can Myco Grow be applied to established plants?

While inoculation is most effective at transplant when spores have direct access to young roots, established plants can be inoculated by working Myco Grow into the soil at the drip line of the plant or by applying it as a soil drench during active root growth periods in spring.

Is Myco Grow compatible with soil fungicides and disease-control programs?

Systemic fungicides that move into root tissue can harm mycorrhizal fungi and should be avoided or timed carefully around inoculation. Contact fungicides applied to foliage or soil surface have less impact on established mycorrhizal colonies. Where disease management is necessary, allow adequate time between fungicide applications and mycorrhizal inoculation.