Rootgrow Mycorrhizal Fungi Fertiliser for Young Bareroot Plants. Mycorrhizal fungi are a remarkable group of organisms that have been benefiting plants for at least 500 million years. At the dawn of time when plants were just beginning to colonise our planet mycorrhizal fungi were there living in a symbiotic relationship with plants enabling them to extract nutrients and hold onto water in very difficult soil conditions. In effect, the fungus provides a secondary root system, a system that is considerably more efficient and extensive than the plants own root system. These fungi are living organisms and will live with the plant, sourcing a continued nutrient supply for its entire lifetime – a truly sustainable plant nutrition solution. In exchange the plant provides carbon and sugars to the fungi. Not unsurprisingly, 90% of all land plants employ this relationship to enhance their own root system. One application supports a plant for life! Manufactured in association with the Royal Horticultural Society. Can quickly increase the root area of new plants. Image for illustration purposes only. Due to geographical locations we are unable to deliver to: Isle of Wight, Isle of Man and Ireland.