When water enters the soil, air is forced out. Organic matter helps clay soil to drain and sandy soil to hold more moisture. Because of its importance in soil health, organic material should be added each year to garden soil. A good source of organic material is a compost pile. Adding compost to the soil will help improve soil texture, increase water infiltration and provide needed nutrients.
Minerals are also important for healthy plant growth.
The right mix of nitrogen, phosphorous and potash is vital to fragrant floral growth. Nitrogen provides plants with rich, green color and stimulates top growth. Phosphorus stimulates root growth and improves the plant's hardiness and overall health. Potash helps the plant produce sugar, starches and oils which promote fruit formation and make the plant more resistant to disease. A good, all-purpose fertilizer can help correct common mineral deficiencies.