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Mycorrhizal Fungi is an organic-based root enhancement product that contains mycorrhizal fungi. David Austin recommends using Mycorrhizal Fungi at planting to get roses and most other plants off to the best possible start in the garden. Biostimulants, including sea kelp extract, vitamins and humic acids, will stimulate root growth and help plants cope with environmental stress. It may also be useful if you are planting where roses have previously been grown. Each pouch will treat up to three bare root or potted roses. We’ve incorporated a resealable top into the pouch design, which is very useful if you only plan to plant one or two roses.