Empathy Rootgrow 360g contains Mycorrhizal Fungi, a totally natural and friendly fungi that colonises and develops a considerably more efficient and extensive secondary root system than the plant's own. For many plants this is usually within 4 weeks and once treated will support them for their lifetime. Plants will benefit from an increased nutrient and water uptake, higher resistance to drought and a more vigorous and healthier plant growth. It'll also reduce plant stress during replanting as well as the need for synthetic or chemical fertilisers. Rootgrow does not work on brassicas, rhododendrons, azaleas, heathers, cranberries or blueberries.