Plant Success Granular Mycorrhizal Root Inoculant

Plant Success Granular Mycorrhizal Root Inoculant

Plant Success Granular is a convenient powdered mycorrhizal root inoculant for use at planting time to mix into the soil and give new transplants the benefits of increased water and nutrient absorbtion.

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This is a granular inoculum used at planting time. It consists of 13 carefully selected mycorrhizal fungal species mixed with high quality biostimulant ingredients like kelp meal, humic and fulvic acids, vitamins and amino acids to improve mycorrhizal germination and effectiveness. Shake granules into the planting hole when planting.

Apply 1 tsp. per perennial or 2-4 tbsp. per #5 ("gallon") tree or shrub.
Associated SKUs
H4003 (16 Ounces)
H4004 (32 Ounces) - Out of stock.
Ships to Hawaii, Alaska & Canada No


Our Standard Garden Goods Shipping is 3-4 Days

Plant Shipping: We will ship your order during the first available zone-appropriate shipping week. Most plant orders arrive within 3-4 days, or less, of leaving our greenhouses. This prompt delivery is provided without additional express charges.

Grass Plugs & Seed: Most orders ship within 5-8 business days (all zones).

Standard shipping costs are $4.99 and up, depending on the size of the order.

Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.

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Reviewsby PowerReviews


by PowerReviews
High Country GardensPlant Success Granular Mycorrhizal Root Inoculant

(based on 1 review)

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Reviewed by 1 customer

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(6 of 6 customers found this review helpful)


Really happy with this product. Worked as specified!


from Sacramento, CA

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    Comments about High Country Gardens Plant Success Granular Mycorrhizal Root Inoculant:

    I sprinkled Plant Success in the plant hole before planting as specified and sprinkled some on top. My plants bloomed amazingly. I'm not sure how much I can attribute the blooming to Plant Success because I also used Yum Yum Mix, but I continue to use Plant Success as I plant more plants.

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    USDA Hardiness Planting Zones

    To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

    • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
    • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

    Find Your Planting Zone:

    Enter your Zip Code to find your USDA Planting Zone

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