We do not recommend fertilizing your wild flowers unless the area is depleted of nutrients.  Fertilization of wildflowers after the plants are established will encourage the growth of unwanted weeds, produce lush foliage and very few blooms.  If you must amend the soil, use a conservative amount of fertilizer at the time of planting.   For best results we recommend a low nitrogen fertilizer with an approximate ratio of  1-3-2  (1 part nitrogen - 3 parts phosphorus - 2 parts potassium).