Jobe's Organics Tree Fertilizer Spikes 16-4-4, 4-Pack (15 Spikes/Box) Slow-Release Organic Feed for Trees & Shrubs

Jobe's Organics 16-4-4 Tree Fertilizer Spikes are slow‑release nutrient sticks designed to feed trees and shrubs for months with a balanced mix of nitrogen, phosphorus, and potassium.

These pre-measured spikes simplify feeding schedules by delivering steady nutrition directly into the root zone. Each spike contains organic-based ingredients formulated to support foliar growth and root development without the need for measuring or mixing powders and liquids. The convenient pack contains four boxes of 15 spikes each, providing enough spikes for multiple trees over a season.

How do the spikes release nutrients and how long do they last?

The spikes use time-release technology that gradually disperses nutrients into the soil as moisture breaks them down. This ensures a more consistent uptake by roots and reduces the risk of overfeeding compared with single-dose applications.

• Slow-release formula distributes nutrients over several weeks to months.
• Activated by soil moisture — no need for frequent reapplication.
• Each spike supplies a measured dose, ensuring uniform feeding per application.

Which types of plants are these spikes suitable for?

These spikes are formulated for trees and shrubs across ornamental, landscape, and fruiting varieties. They work well on newly planted and established woody plants to support seasonal growth and vigor.

• Safe for ornamental trees, evergreens, and deciduous shrubs.
• Can be used around fruit trees and landscape specimens.
• Not intended for use on lawns, annuals, or vegetable gardens unless specified on the label.

How do I apply the fertilizer spikes correctly?

Application is straightforward: insert spikes into the soil around the dripline or root zone at prescribed intervals. Proper placement and spacing ensure even nutrient distribution and better root access.

• Place spikes evenly around the tree’s dripline, not directly against the trunk.
• Follow label spacing guidelines based on tree size for best results.
• Insert spikes into moist soil and water lightly if conditions are dry to activate release.

What are the measurable benefits of using these spikes?

Using pre-measured, time-release spikes reduces guessing on dosage and timing while providing steady nourishment to promote healthier foliage and root systems. They save time and limit lawn or landscape disturbance compared with granular or liquid feeding.

• Eliminates measuring errors and messy handling of wet formulations.
• Minimizes soil disturbance during application.
• Supports consistent growth through predictable nutrient delivery.

Who is this for: Homeowners, landscapers, and gardeners who want a low-effort method to feed trees and shrubs. These spikes suit anyone seeking measured, slow-release nutrition with easy insertion and minimal ongoing maintenance. Choose this four-pack when you have several plants or need multiple applications across a season.