10 Best Tree Fertilizers 2025 in the United States

This 10-10-10 slow-release granular fertilizer offers a balanced mix of nitrogen, phosphorus, and potassium, making it a versatile choice for a variety of trees like fruit trees, evergreens, oaks, and shrubs. Its slow-release formula feeds plants steadily for up to eight weeks, reducing how often you need to apply it—usually twice per growing season for gardens and three times annually for trees and shrubs. This can save effort while supporting healthy root development, vibrant leaves, and overall plant resilience.

The fertilizer granules are easy to spread evenly across outdoor soil, which helps ensure good nutrient absorption. It also contains quick-release nitrogen for a fast growth boost alongside the slow feeding effect. One downside is it’s a synthetic product, so if you prefer organic options, this wouldn’t fit that preference. The 10-10-10 ratio is well-rounded but may not be ideal if your trees need targeted nutrients at certain growth stages.

This fertilizer performs well for general tree and garden feeding with minimal fuss, especially if you want a balanced nutrient supply and less frequent application. However, organic gardeners or those needing special soil adjustments might want to look for products with added micronutrients or pH-specific formulations.

The GardenWise Professional Citrus Fertilizer is designed specifically for citrus trees such as orange, lime, avocado, and lemon. It offers a balanced N-P-K ratio of 6-4-6, supporting healthy leaf growth, flowering, and fruit quality. This balance is especially beneficial during winter, when steady nourishment helps maintain tree strength and fruit production.

The granules contain important micronutrients including magnesium, zinc, copper, iron, and boron, which contribute to leaf greening, plant defense, metabolism, and fruit development. These nutrients enhance the health and flavor of your fruit. The synthetic fertilizer is granular with a slow-release coating, allowing nutrients to be gradually released with watering. This reduces the need for frequent applications, making it convenient and cost-effective.

Application is straightforward: simply sprinkle around the tree base and water in, making it suitable for both beginners and experienced gardeners. Although tailored specifically for citrus trees, it may not be ideal for other fruit or ornamental trees. This fertilizer offers a well-balanced nutrition solution for those aiming to improve the health and yield of their citrus trees with minimal effort.

The BioAdvanced 701525A 12-Month Shrub Control Insect Killer and Tree Fertilizer is a unique product that combines insect control with fertilization, making it particularly beneficial for gardeners looking to protect their trees and shrubs from pests while also promoting their growth. With a slow-release formula, it enhances the health of plants over time, which is a strong point for those who prefer less frequent applications. The systemic protection feature ensures that the treatment penetrates the entire plant, providing comprehensive defense against harmful insects like Japanese Beetles and Emerald Ash Borers.

However, it’s important to consider some drawbacks. The product is a synthetic formulation, which may not appeal to those who favor organic gardening practices. Additionally, the restrictions on sale in certain states and counties could limit accessibility for some users. The need for a single application to provide protection for up to a year is a significant advantage, but it also means that if applied incorrectly, you may not see the desired results.

This product is ideal for homeowners and landscapers looking for an efficient solution to manage both pests and plant health with minimal effort, as long as they are aware of its synthetic nature and regional restrictions.