A general purpose 20-20-20 fertilizer provides over 60% nutrient value in a 1-1-1 ratio . This makes it suitable for a wide variety of growing situations . It is widely used on containerized stock in the nursery industry and for greenhouse crops such as foliage plants and bedding plants . For institutional and general landscape maintenance, it is ideal because it works well on turf, trees or shrubs as well as blooming plants and it can be used as a single all purpose feed .