Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Feeding a towering evergreen is the kind of gardening chore that feels both urgent and tedious. A tree that is too big for a bucket of liquid feed needs a solution that does the work below the soil line, steadily, over weeks — not one that demands you drag a hose around the whole yard. That is where fertilizer spikes come in: pre-measured sticks you hammer into the ground around the drip line, where they break down slowly and deliver nutrients straight to the roots.
I’m Rikta — the founder and writer behind Lawn Gear Lab. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Below I break down the four strongest options, from a crowd-favorite pack that owners call “the absolute BEST” for green giants to a premium bulk set that feeds for a full season. Whether your yard is full of arborvitae, blue spruce, or pencil holly, this roundup of the best fertilizer spikes for evergreen trees helps you pick the right one without second-guessing.
Our Picks at a Glance
How To Choose The Best Fertilizer Spikes For Evergreen Trees
Evergreens have different needs than a flowering dogwood or a fruit tree. They want a steady supply of nitrogen to keep those needles and leaves a deep, healthy green, and they prefer a slow trickle of food rather than a sudden feast. Here is what to look for when browsing.
N-P-K Ratio — the three numbers that tell the story
The ratio on the bag (for example 13-3-4 or 8-8-8) stands for nitrogen (N), phosphorus (P), and potassium (K). Evergreens are heavy nitrogen feeders — the first number — because nitrogen drives that lush, rich green color and vigorous leaf and needle growth. A spike with a high first number, like 13, is usually formulated specifically for evergreens and acid-loving trees. A balanced formula like 8-8-8 works for mixed landscapes with both evergreens and deciduous trees.
Spike count and coverage area
Spikes come in packs of 5, 12, 15, or 24. Do not just buy the biggest box — match the count to the number and size of your trees. A single small arborvitae might only need one spike, while a large green giant could take three or four. The 24-pack is overkill for a single shrub but perfect for a row of privacy trees. Think about how many trees you are feeding and how many times a year you want to buy spikes.
Release duration and application schedule
Most spikes release nutrients over a period of about 90 days (roughly three months). The standard recommendation is to apply them twice a year — once in early spring when the tree is waking up and putting out new growth, and again in late fall as it stores energy for winter. A spike that lasts a full 90 days means you only have to do the job twice, making it a genuine set-and-forget solution.
Quick Comparison
| Model | Best For | N-P-K Ratio | Spike Count | Release Duration | Amazon |
|---|---|---|---|---|---|
| Jobe’s Evergreen (15-pack)★ Best Overall | Large evergreens & green giants | 13-3-4 | 15 Spikes | Up to 90 days | Amazon |
| Jobe’s Slow Release (5-pack) | Small trees & targeted feeding | 11-3-4 | 5 Spikes | Up to 90 days | Amazon |
| Miracle-Gro Tree & Shrub (2-pack) | Foliage color & overall vigor | — | 24 Spikes | Season-long (2x per year) | Amazon |
| SimplyGro TruSpikes (24-pack) | Deep root feeding & durability | 8-8-8 | 24 Spikes | Up to 3 months | Amazon |
In‑Depth Reviews
1. Jobe’s Evergreen Fertilizer Spikes (15-pack)
Our pick — over 4.5★ from 250+ verified ratings; the strongest balance of quality and price.
The high-nitrogen evergreen specialist that owners call unbeatable for green giants.
This is the spike that owners reach for when they want results they can see. With a 13-3-4 NPK formulation built specifically for evergreens, each spike delivers a hefty dose of nitrogen — the nutrient evergreens crave most for dense, dark green growth. The 15-count box covers a solid row of privacy trees, and the slow-release design feeds for up to 90 days, so you only need to apply twice a year.
The thing owners praise most is sheer effectiveness — buyers report their green giants “grow bigger and more beautiful every year.” The spikes are tough enough that they do not crumble or break when you hammer them into dry ground, though owners note it is smart to wait for a rain to soften the soil first. It outpaces the smaller Jobe’s 5-pack below by a wide margin on value, at 15 spikes versus the 5-pack’s 5 spikes.
Why owners swear by it
- High-nitrogen evergreen-specific blend (13-3-4) drives visible color improvement
- 15 spikes cover multiple large trees without repurchasing mid-season
- Slow release over 90 days prevents root burn and runoff
The honest trade-off
- Harder to hammer in when the ground is dry — soften it with rain or a hose first
- 15-pack may be more than a small yard with a single shrub needs
Best suited for: Anyone with multiple large evergreens — green giants, arborvitae, pine — who wants a one-and-done spring-and-fall feeding routine.
Think twice if: You have only one small tree or shrub; a 5-pack would be less wasteful.
2. Jobe’s Slow Release Evergreen Fertilizer Spikes (5-pack)
A tiny pack that punches above its weight for small evergreens and targeted feeding.
If you have a single blue spruce in the front yard or a few arborvitae along the fence, you do not need a 24-spike bulk box. This 5-spike pack from Jobe’s is the right size for the job, and owners confirm it delivers. The 11-3-4 ratio is purpose-built for evergreens, providing the nitrogen punch they need without overwhelming the roots — an “old fella once told me these are the best to use for evergreens,” one owner shares. Applied twice a year (early spring and late fall), each spike feeds roots steadily for the season.
The most-discussed aspect is that buyers often misread the listing and expect a 5-pound bag — this is 5 individual spikes, not 5 pounds of product, so check the count before you add to your cart. For the price, though, it is an ideal trial pack or a solution for a small yard. One owner used a single spike per small arborvitae (instead of the recommended three) and still saw nearly a foot of new growth in a season.
Perfect starter pack: Five spikes cover a few small trees or shrubs without waste, and the evergreen-specific 11-3-4 formula gives visible results for a low entry cost.
Know before you buy: This is 5 spikes, not 5 pounds — check the count to avoid disappointment; users who miss that are the rare dissatisfied buyers.
Reach for this if: You have a small number of evergreens and want a precise, low-commitment feeding option that costs less than a lunch out.
skip it if: You need to feed a hedge row of 10+ trees — the 15-pack or 24-pack is more economical.
3. Miracle-Gro Tree & Shrub Plant Food Spikes (24 spikes)
The 24-spike pack with a rubber cap that makes installation a one-handed job.
This is the set that owners describe as a “must have for your trees” and a “springtime must.” The 2-pack contains 24 spikes total, giving you enough to feed a row of evergreens for a full season. Miracle-Gro promotes vibrant color and lush foliage, and owners confirm the results — their trees and bushes are “thriving” and “looking great.” The spikes contain natural ingredients and feed once per season in spring and fall, making the schedule easy to stick to.
Owners rave about the included rubber cap, which protects the spike as you hammer it into the ground — though a few owners mention that one cap went missing from their pack. The spikes themselves are larger than expected, and they can turn dark or black when exposed to air, so open the package only when you are ready to use them. Compared to the 15-count Jobe’s, this gives you 9 more spikes for a higher upfront cost, so it works best when you have a larger yard to feed.
What owners love
- Rubber installation cap makes driving them in quick and mess-free
- 24 spikes cover a large number of trees — great for privacy hedges or property lines
- Natural ingredient formula appeals to those avoiding synthetic chemicals
What to watch for
- Some packs arrive missing the plastic cap, forcing you to dig a hole instead of hammering
- Spikes oxidize and turn black once exposed to air — use the whole pack promptly
Grab it for: Medium-to-large yards with a mix of evergreens, deciduous trees, and acid-loving plants like hydrangeas — one box feeds it all.
Pass it by if: You are on a tight budget; the per-spike cost is higher than the Jobe’s 15-pack.
4. SimplyGro TruSpikes (24 Spikes — 3 Lbs)
A shatterproof, balanced spike that owners call “invisible when inserted” — and it works.
The standout claim here is that these patented TruSpikes “will NOT break, crush or smash — guaranteed.” Owners confirm it: the spikes are thick and durable, driving into even tough ground without snapping. The 8-8-8 balanced formula makes this a versatile choice for a mixed landscape — it feeds deciduous, coniferous, flowering, and fruiting trees and shrubs alike. Each 5-inch spike is packed with nutrition that releases continuously for up to 3 months, so you apply in spring and again in fall and then you are done.
The most-discussed praise center on effectiveness and quality — owners saw winter-damaged plants in central Florida perk up in just a few weeks, with Plumbago, Hibiscus, and Bottle Brush blooming beautifully. The balanced 8-8-8 ratio is noted as a plus for those who want to avoid a nitrogen-heavy blast. With 24 spikes in the box, this is the largest quantity in the roundup, making it ideal for a property with many trees. The honest trade-off: the spikes are invisible when fully inserted, so you will want to mark the spots to avoid accidentally driving a new one right next to an old one.
The big advantage: You get 24 spikes at once — 60% more than the 15-count Jobe’s — for a landscape with many trees, and the guaranteed shatterproof build means zero crumbly mess.
The catch: Rock gardens make installation a chore — you have to scrape away stones first; owners in those gardens say it is worth the effort but be aware.
Pick this if: You have a large property with a mix of evergreens and other trees, and you hate crumbly, low-quality spikes that fall apart when hammered.
pass on it if: You need an evergreen-specific high-nitrogen formula — the 8-8-8 is balanced, not nitrogen-forward like the Jobe’s 13-3-4.
Understanding the Specs
N-P-K Ratio (Nitrogen-Phosphorus-Potassium)
These three numbers tell you the percentage of each primary nutrient in the spike. Evergreens need a high first number (nitrogen) for deep green foliage. A 13-3-4 or 11-3-4 is ideal for evergreens and acid-loving plants. A balanced 8-8-8 works for mixed yards with both evergreens and deciduous trees. Stick with the ratio that matches your landscape.
Slow Release Duration
Most quality spikes release nutrients gradually over a period of about three months (90 days). This is better than an instant liquid feed because it prevents root burn and runoff, and it means you only need to apply fertilizer twice a year — once in early spring and once in late fall. A spike that lasts a full 90 days is the standard to look for.
FAQ
How many fertilizer spikes should I use per evergreen tree?
When is the best time to apply fertilizer spikes to evergreens?
Can I use regular tree fertilizer spikes on evergreens, or do I need a special evergreen formula?
Are fertilizer spikes better than granular or liquid fertilizer for evergreens?
How deep should I hammer a fertilizer spike into the ground?
Will fertilizer spikes burn my evergreen trees if I use too many?
Can I use these spikes on potted or container evergreens?
How long do fertilizer spikes last in the ground before I need to reapply?
Do I need to water the spikes after hammering them in?
Can I use spikes formulated for evergreens on other acid-loving plants like azaleas or hydrangeas?
Final Thoughts: The Verdict
The real takeaway here is that you do not need to overthink it. The fertilizer spikes for evergreen trees that earn the top spot is the Jobe’s 15-pack because it combines a purpose-built 13-3-4 evergreen formula with the spike count that fits most medium-to-large yards. If your yard is smaller or you want a low-commitment trial, the Jobe’s 5-pack covers the same task at a lower entry cost. And for a large property with a mix of trees, the SimplyGro TruSpikes 24-pack delivers the most spikes in one box with a shatterproof build that owners genuinely appreciate. Pick the one that matches your yard size and your feeding philosophy — any of them beats leaving your evergreens hungry.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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