★ 4.9 STARS (1,077+ REVIEWS) • SERVING THE ST. CROIX VALLEY & WESTERN WI
Expert Plant Health Care & Tree Preservation
Protect your landscape’s most valuable assets before it’s too late. From stopping Emerald Ash Borer and Oak Wilt to deep-root fertilization and seasonal disease prevention, our certified arborists use safe, targeted treatments to protect, treat, and preserve your trees and shrubs—backed by our 100% Satisfaction Guarantree™.
✓ Certified Arborist Diagnostics & Custom Care Plans
✓ Protection Against Regional Pests & Diseases (EAB, Oak Wilt, Apple Scab)
✓ Safe, Targeted Applications (Trunk Injections & Deep-Root Feeding
Proactive Protection.
Long-Term Vitality.
Tree diseases and invasive pests like Emerald Ash Borer or Oak Wilt can destroy mature trees before visible symptoms ever appear. At NWI Tree Service, our Plant Health Care programs focus on targeted, science-backed treatments rather than blanket chemical spraying. We diagnose root causes, fortify tree immunity, and deliver direct trunk injections and deep-root feeding that safeguard your property's mature canopy.
Our 3-Step Plant Health Care Process
From pinpointing early disease symptoms to targeted trunk injections, we make protecting your mature trees clear, effective, and hassle-free.
Comprehensive Health Inspection
A trained specialist evaluates your trees, identifies active insect or fungal threats, inspects root zones, and determines exact soil nutrient needs.
Targeted Micro-Treatments
We apply direct trunk injections or deep-root soil treatments designed specifically for your tree's diagnosis—eliminating pests with zero spray drift.
Ongoing Seasonal Defense
We schedule timely follow-ups and preventative multi-year protection plans so your canopy stays healthy, green, and resilient year after year.
Got Questions About Plant Health Care?
Everything you need to know about pest treatments, pet safety, and saving mature trees.
Can a tree infected with Emerald Ash Borer or disease actually be saved? +
Yes—if caught early! Preventative and early-stage trunk injections can effectively eradicate Emerald Ash Borer larvae and halt fungal infections. As long as a tree retains at least 70% of its leaf canopy, treatment can usually restore its health. If a tree is too far gone, we will provide an honest recommendation on whether preservation or safe removal is the best option.
Are your plant health treatments safe for my children and pets? +
Unquestionably. Whenever possible, we utilize direct trunk micro-injections and subsurface root feedings rather than high-pressure canopy spraying. This seals the treatment inside the tree’s internal circulatory system, eliminating chemical spray drift, toxic lawn runoff, and exposure to family members or pets.
What is deep-root soil fertilization, and why does my tree need it? +
Urban and suburban soil often lacks the rich organic matter found on forest floors. Deep-root fertilization injects a high-grade blend of liquid nutrients, bio-stimulants, and mycorrhizae 4 to 8 inches into the root zone. This breaks up compacted soil, promotes deep root expansion, and boosts natural immunity against environmental stress.
How do I know if my tree is sick or just undergoing normal seasonal changes? +
Warning signs of stress or active infection include premature leaf drop, yellowing or spotted leaves in mid-summer, thinning upper canopy, dieback on major branch tips, or unusual bark peeling. If you notice any of these indicators, an onsite health assessment can diagnose the exact cause before permanent damage occurs.
How frequently do trees need Plant Health Care treatments? +
Treatment schedules vary depending on the target threat. For instance, trunk injections for Emerald Ash Borer typically provide 2 full years of complete protection per application. Fungal leaf-spot treatments or deep-root feeding are usually scheduled annually or seasonally. We build a clear, multi-year protection schedule tailored to your property.
The NWI Service Guarantree™
“As a local, family-owned business, our reputation is built on every yard we enter. If you are not 100% satisfied with our work, cleanup, or safety protocols, we will return and make it right—guaranteed.”
