I like plants. I invested a lot of money in having a great garden (which actually designed it in collaboration with an architect specialized in contemplation gardens). So, I question every recommendation my gardener say about fertilizer, mowing height, water frequency, etc. And I always find different answers with any logic! This book provided me excellent and precise information about I said. Now I already known that my lawn surface needs 2.29 pounds of a mix of with 17 Nitrogen a year, than I need to spread that amount in 4 times during the year only in late spring and fall, etc, etc. Totally recommendable!