Ans- For a healthy lawn you need to fertilize it all year every 4-6 weeks apart.They have a whole year of season-based fertilizer that’s why I have found Scotts Turf Builder worth it.u003cbru003e You need a whole year’s plan for it. Here you can get an idea-u003cbru003e1. Early Spring Fertilizing- Once between February and April. This is the first time in a year after winter.u003cbru003e2. Late Spring Fertilizing- Once between April and June, 6 to 8 weeks later the first early spring fertilizing.u003cbru003e3. Summer Fertilizing- Once between June and August, 6 to 8 weeks later the late spring fertilizing.u003cbru003e4. Fall Fertilizing- Between August and November, right before winter hits, 6 to 8 weeks after the summer fertilizing.