Tree Service Portland | Urban Forest Pro

Deep Root Fertilization is the preferred and most effective method for fertilizing trees and shrubs.
Through this process a liquid, time-released fertilizer is pressure injected in a grid pattern into the root
zone of the tree or shrub. Well nourished trees and shrubs have better resistance to disease, insect attack,
and drought. Deep root fertilizing can help keep your trees and shrubs healthier, promoting the luxurious
foliage that adds beauty and value to your property. Liquid fertilizer is injected directly into the root zone
area for maximum benefits. Its slow release action won’t burn delicate feeding roots, at Urban Forest we
use a fertilizer with a 6 month time release. Deep root fertilization can also help with problems of soil
compaction. Liquid fertilizer injected into the root zone under pressure helps aerate the soil, opening up air
pockets helping to provide much needed oxygen to the root system.

This method of fertilization is especially useful for trees and shrubs growing in lawns or having other
vegetation such as ivy or other groundcover around them. The fertilizer is injected below the roots of the
surface vegetation to provide maximum benefit to the slightly deeper roots of the trees and shrubs.
Surface fertilization, such as typical lawn fertilization, usually does not provide a significant benefit to trees
and shrubs. When applied to the surface the thick, fibrous roots of lawn and groundcovers utilize and hold
the nutrients, not allowing them to infiltrate to the deeper sub-surface soil layer where the roots of the
trees and shrubs reside. Micronutrients, such as iron and manganese, systemic insecticides, and
Mycorrhizae can also be added to fertilizer and be deep root injected to help treat other common tree and
shrub problems.

Tree Serivce Portland | Urban Forest Pro, LLC