"Soil Revitalizer, Iron Tonic, Granular NPK" Grow Quickly Is Optimal for Both Indoor and Outdoor Use Plants improve the soil's vitality, aid in iron deficiency, and support plants under harsh situations. Revitalizing Soil: It prevents the roots from rotting and revitalizes the soil. Stimulates the biology of the plant and aids in the growth of stronger, healthier roots. Utilizing Grow Fast Soil Revitalizer on a regular basis aids in enhancing the microbial activity of the soil and strengthening the root structure. Plants with healthy roots are healthy overall. Iron Tonic: Protects plants from the yellowing of their leaves. Plants lacking in iron will no longer exist. Granular NPK: Granular NPK's high nitrogen concentration encourages growth and supports plants under adverse circumstances.