18-5-10 features Methelene Urea, slowly active nitrogen. Long preferred by professional growers for long-lasting feeding with 70% controlled release nitrogen, 18-5-10 is the ideal labor saving single application topdress for feeding trees, shrubs, groundcovers, and other landscape ornamentals. NutriSCAPE is high active nitrogen source that provides extended feeding without the need for coatings. Microbial release allows Methelene Urea to release nitrogen when the plant needs it the most