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Arborvitae are the backbone of most privacy hedges, but they have a specific hunger that a general all-purpose fertilizer cannot satisfy. Feed them the wrong mix and you get yellowing tips, sparse branches, and a hedge that takes years to fill in. This guide cuts through the marketing to the fertilizers that actually deliver denser, greener growth — whether you manage a single specimen tree or a long row of plantings.
I’m Mohammad Maruf — the founder and writer behind WellFizz. 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.
We have focused on products that deliver the essential nutrients your evergreens need, from fast-acting liquids to set-and-forget spikes. Here is our curated list of the best fertilizer for arborvitae to keep your hedge thick and vibrant all year long.
Our Picks at a Glance
How To Choose The Best Fertilizer For Arborvitae
Arborvitae are acid-loving evergreens that need a steady supply of nitrogen for lush, green foliage and a good dose of potassium for strong root systems. The wrong NPK ratio — one too high in phosphorus, for example — can leave your hedge looking sad. Here is what to check before you buy.
Understand the NPK Ratio
The three numbers on a fertilizer bag stand for Nitrogen (N), Phosphorus (P), and Potassium (K). For arborvitae, you want a higher first number — nitrogen — because it drives leaf and needle growth. A ratio like 4-3-4 (balanced) or 12-3-3 (high nitrogen) works well. Too much phosphorus (the middle number) is unnecessary for trees that mainly need foliage.
Granular vs Liquid vs Spikes
Granules (like Espoma Evergreen-Tone) are the classic choice: you sprinkle them around the drip line and water them in. They break down slowly and feed over weeks. Liquid fertilizers (like the TPS Nutrients Arborvitae Food) act fast but require mixing and reapplying every few weeks. Spikes (like SimplyGro or Jobe’s) are the easiest — hammer them into the ground and they release nutrients over months with zero measuring.
Look for Acid-Loving Formulas
To keep your arborvitae healthy, you need soil that is slightly acidic (pH 5.5–6.5). A fertilizer made for acid-loving plants, which often includes sulfur or other acidifiers, helps maintain that pH range. Many top picks here, including Espoma Holly-Tone, contain sulfur to keep the soil acidity just right.
Quick Comparison
| Model | Best For | Type | NPK Ratio | Feeding Duration | Amazon |
|---|---|---|---|---|---|
| Espoma Holly-Tone 4-3-4★ Best Overall | Acid-Loving Evergreens | Granules | 4-3-4 | Slow-release | Amazon |
| TreeHelp Premium for ArborvitaeSpecialist Pick | Specialized Arborvitae Care | Granules | — | Slow-release | Amazon |
| TPS Nutrients Arborvitae LiquidFast Green-Up | Quick Green-Up | Liquid | — | Fast-absorbing | Amazon |
| SimplyGro Evergreen Spikes 12-3-3 | Mess-Free Set-and-Forget | Spikes | 12-3-3 | Up to 3 months | Amazon |
| Old Farmer’s Almanac Spikes 10-4-10 | Strong Roots & Foliage | Spikes | 10-4-10 | Slow-release | Amazon |
| Espoma Evergreen-Tone 4-3-4 (18 lb) | Large Properties | Granules | 4-3-4 | Slow-release | Amazon |
| Nelson NutriStar 21-6-8 | Quick Nitrogen Boost | Granules | 21-6-8 | 30-day feed | Amazon |
| Jobe’s Slow Release Spikes 11-3-4 | Bulk/Big Hedge Projects | Spikes | 11-3-4 | Slow-release | Amazon |
In‑Depth Reviews
1. Espoma Organic Holly-Tone 4-3-4
Our pick — over 4.5★ from 700+ verified ratings; the strongest balance of quality and price.
The original acid-lover’s food that keeps arborvitae a deep, envy-inducing green.
This is the fertilizer that nearly every seasoned gardener reaches for. With a balanced 4-3-4 NPK ratio and 5% sulfur to keep soil acidic, Holly-Tone feeds arborvitae without shocking them. The organic granules break down slowly, meaning one application in spring and another in fall builds a steady nutrient reservoir. It is approved for organic gardening and made in the USA by Espoma, a company that has specialized in natural organics since 1929.
What wins people over is the sheer plant benefits — it is the most-discussed aspect, and for good reason. Owners on a massive scale report that azaleas, hydrangeas, and evergreens all perk up noticeably within a week. One summary of the experience is that neighbors’ plants start to fade while theirs stay vibrant and gorgeous. At 4.1 pounds, this bag is lighter than Espoma’s own Evergreen-Tone (which weighs 8 pounds), but the concentrated 64-ounce unit count makes it a precise fit for a few specimen trees or a shorter hedge row. The recurring comment is that it is slightly pricier per pound than generic alternatives, but the visible results justify the investment.
Why it leads
- Rich organic formula with Bio-tone microbes for root health
- 5% sulfur acidifies soil naturally for arborvitae
- Ready to use granules — no mixing required
One trade-off
- 4.1 lb bag covers less area than larger bulk options
Grab it for: A reliable, organic slow-feed that turns acid-loving evergreens deep green with two applications a year.
Look elsewhere if: You have a long hedge row and need a larger bag to cover more ground in one trip.
2. TreeHelp Premium Fertilizer for Arborvitae
A slow-release formula made exclusively for arborvitae, not just any evergreen.
This is the only pick on the list that names arborvitae in its very name. The formula focuses on root development with slow-release nitrogen that feeds through the entire growing season. Each 52.91-ounce bag (just over 3.3 pounds) treats one large tree or two to three smaller or newly planted trees. That makes it a precise solution if you have a few specimen arborvitae rather than a full hedge.
The real-world testimony is compelling. As owners put it: “We sprinkled the food under the Arborvitaes just before a lot of rain came. Arborvitae were browning before but now they are green.” One owner with a row of 50 arborvitae confirmed the slow-release worked well, though it took time to work into the ground. The main point of disagreement is the application rate — some feel the recommended 3-pound dose per tree is too generous. If you follow the instructions, it works; if you prefer lighter feeding, split the bag across more trees. The low star-rating count (52 ratings) means the data is thinner than the Espoma options, but the targeted formula is unique.
Best for dedicated arborvitae owners: This is the only product formulated with arborvitae as the primary species, and the slow-release nitrogen has a proven track record of restoring browning trees. The trade-off is the smaller bag size — at 52.91 ounces it is 21% less by volume than the Espoma Holly-Tone’s 64 ounces for a similar price point.
3. TPS Nutrients Arborvitae Liquid Fertilizer
Liquid fast-absorbing nutrition for arborvitae that need an immediate color boost.
When your arborvitae are looking pale and you want results in days rather than weeks, this liquid formula delivers. The 32-ounce bottle mixes at 2 tablespoons per gallon of water, making it highly concentrated. It is made specifically for arborvitae and evergreen hedges, with the stated goal of supporting dense foliage and root strength. It works well on trees that are still healthy — as several owners point out, it promotes new growth but will not revive trees that are already dead.
The effectiveness and plant growth aspects are the most praised, with 27 and 23 mentions respectively. One owner with sandy soil reported that biweekly feeding revived dying branches and promoted lush growth. The liquid format means you can target specific trees without waste, and the fast-absorbing formula is ideal for a quick mid-season pick-me-up. The honest limitation is that you need to reapply more often — every few weeks during the growing season — compared to a granular or spike product that feeds for months.
Your go-to for a rescue feed: If your arborvitae are browning or showing nitrogen deficiency, this liquid food acts fast. The main catch is the frequency — it requires biweekly mixing and watering during the growing season, so it demands more of your time than set-and-forget spikes.
4. SimplyGro Evergreen Spikes 12-3-3
Hammer-and-forget spikes that release a high-nitrogen feast for three months.
If the thought of measuring granules or mixing liquids makes you groan, these 5-inch TruSpikes are your answer. The 12-3-3 NPK ratio is heavily front-loaded with nitrogen — exactly what arborvitae crave for dense foliage. Each spike feeds continuously for up to 3 months, and the patented design means you hammer them straight into the ground with no plastic cap and no broken spikes. Apply twice a year (spring and fall) for full coverage.
Effectiveness is the most-praised aspect here, with 14 mentions. Owners with sandy soil report that time-release nitrogen keeps feeding for months, unlike compost or manure that washes away. The tree health improvements are dramatic — one owner noted their trees have resisted worms that attacked all surrounding trees after using these spikes. The 12-count box covers a moderate number of trees, so large hedge owners may need multiple boxes. The spikes are pre-measured, eliminating any guesswork about over-fertilizing.
Best for low-maintenance feeding: Simply hammer these spikes into the ground at the drip line of each arborvitae and let them work for a full quarter. The catch is coverage — 12 spikes handle a few trees well, but a long hedge will require buying multiple boxes.
5. The Old Farmer’s Almanac Evergreen Spikes 10-4-10
A balanced spike with extra magnesium for richer color and stronger roots.
These spikes from The Old Farmer’s Almanac use a 10-4-10 formula — high in nitrogen and high in potassium — with an added 6% magnesium for an extra punch. The magnesium helps with chlorophyll production, which translates to that deep, vibrant green you want from your arborvitae. Like the SimplyGro spikes, these are patented TruSpikes that you hammer directly into the soil with no cap needed. They release nutrition into the root zone with zero waste or runoff.
The ease of use is the most-discussed aspect, with 6 mentions. Owners tell stories of hollies growing really well and trees looking much happier, fuller, and taller than others in the same neighborhood. The 12-count box is ideal for a small hedge or a few specimen trees. The slightly lower nitrogen percentage than the SimplyGro spikes (10% vs 12%) means a gentler feed, which can be better for newly planted trees that are sensitive to burn.
Pick this for: A gentler feed that is enriched with 6% magnesium to support lush foliage and sturdy roots — a feature that separates it from other spike formulas. The trade-off is a lower overall nitrogen count than the SimplyGro 12-3-3, so it may not green up your trees as aggressively.
6. Espoma Organic Evergreen-Tone 4-3-4 (18 lb)
The same proven organic formula, now in a 18-pound sack for serious hedges.
If you have a long row of arborvitae or multiple large evergreens, the 8-pound bag starts to feel small. This 18-pound bag delivers the same 4-3-4 analysis with Bio-tone microbes, but in a bulk format that lasts the whole season. It is an organic fertilizer approved for organic gardening, and it is the same product that owners have used for years with consistent results — rich color and abundant growth.
The top-praised aspect here is quality, with 16 mentions, followed by growth (14 mentions) and effectiveness (13). One long-term user reports: “Definitely provides results of rich color and abundant growth. I have been using this product for years with consistent results. Don’t use anything else.” The smell is a recurring point — it smells like a barnyard because it contains chicken manure — but that is a sign of genuine organic content rather than synthetic filler. A small number of owners reported negative results on specific pines and thujas, so spot-test on a single tree first if you are concerned.
The big bag advantage
- 18 pounds covers a large hedge or multiple large trees
- Same trusted Espoma organic formula with Bio-tone
- Approved for organic production
Consider this
- Strong organic odor for a few days after application
Choose this when: You have a large property with many evergreens and want the most cost-effective way to get the proven Espoma organic formula across the whole yard.
pass on it if: You need a quick nitrogen fix — the slow-release organic granules take weeks to show visible greening.
7. Nelson NutriStar 21-6-8 Granular Fertilizer
A high-nitrogen 21-6-8 formula for trees that need an immediate color correction.
This is the heaviest hitter on the list for raw nitrogen content. At 21% nitrogen (compared to 4% in the Espoma organics), the NutriStar formula delivers a fast greening effect that is hard to match. It uses five different nitrogen sources, each with a different time-release characteristic, so feeding is steady rather than a single dump. The 4-pound bag is stated to feed in-ground and container-grown trees, shrubs, and evergreens.
Effectiveness is the most-praised aspect by a wide margin. One owner on boxwoods reported immediate greening after application — within two days, almost all yellow and orange foliage was gone. Another had anemic, yellow, dying plants turn into thriving, bright green, shiny shrubbery within two weeks. This is a synthetic formula (not organic), so it works faster and with a higher potency than the Espoma lines. The trade-off is that it must be applied every 30 days during the growing season, whereas organic granules last longer between applications. The label also warns against over-application, as the high nitrogen can burn roots if misapplied.
The speed edge
- 21% nitrogen for dramatic greening in days
- Five nitrogen sources provide sustained feeding
- Works on in-ground and container trees
Required discipline
- Must reapply every 30 days during growing season
- High nitrogen can burn if not measured carefully
Grab it for: A rapid, visible green-up of arborvitae that have turned yellow from nitrogen deficiency. The 21% nitrogen is class-leading by any other pick here.
Look elsewhere if: You prefer a single annual application or an organic-certified product — this requires monthly reapplication and is synthetic.
8. Jobe’s Slow Release Evergreen Spikes 11-3-4 (160 Count)
A bulk box of 160 spikes that feeds an entire hedge rows for a full year.
When you have a long privacy hedge of arborvitae — 50, 100, or more trees — buying individual spike boxes gets expensive fast. This Jobe’s bulk box packs 160 pre-measured spikes with an 11-3-4 NPK ratio designed for evergreens including arborvitae, cypress, pine, and cedar. The spikes release nutrients continuously for months and are applied twice a year (spring and fall). The manufacturer also makes a range of formulas, so you can trust the species targeting.
The quality and value for money are the most praised aspects, each with 19 mentions. One owner fertilized 15-20 evergreens in late fall and saw impressive growth and greened up struggling Italian cypress. Another noted that the spikes are a more affordable option than smaller packs when you have 150+ trees. The honest caveat is spike quality — some boxes arrive with a few broken spikes from being thrown loosely in the box. The broken pieces are still usable but are shorter. The slow-release nitrogen can also stimulate new growth that is vulnerable to cold snaps, so time your application carefully.
Why buy 160
- Cost-effective per spike compared to 12-packs
- 11-3-4 ratio is ideal for arborvitae foliage
- Pre-measured to prevent over-fertilizing
One issue
- Some spikes arrive broken due to loose packaging
Perfect for: Large hedges and properties with many evergreens where buying small boxes is impractical. The 160 spikes can cover a full hedge row for both spring and fall applications.
it’s not for you if: You only have a few arborvitae — a 12 or 18-count box is less wasteful and cheaper upfront. Also avoid if you prefer organic certification over synthetic spikes.
Understanding the Specs
NPK Ratio
The three numbers stand for Nitrogen (N), Phosphorus (P), and Potassium (K). For arborvitae, the first number — nitrogen — is the most important. It fuels leaf and needle growth to keep your hedge dense and green. A ratio like 4-3-4 or 11-3-4 provides a good balance, while a high-nitrogen formula like 21-6-8 gives a faster green-up. Avoid high-phosphorus blends (a high middle number) since arborvitae do not flower heavily and do not need the extra phosphorus.
Slow-Release vs Fast-Acting
Granular and spike fertilizers break down slowly over weeks or months, giving a steady feed with less risk of burning roots. Liquid fertilizers work within days but wash away faster, so you need to apply them more often. For established arborvitae, a slow-release option (organic granules or spikes) is the most simple to use approach. For a quick rescue of yellowing trees, a fast-acting liquid or high-nitrogen granular can turn things around within two weeks.
FAQ
What is the best NPK ratio for arborvitae?
Can I use general all-purpose fertilizer on arborvitae?
How often should I fertilize arborvitae?
Are liquid fertilizers better than granular for arborvitae?
Will fertilizer spikes hurt my arborvitae?
Can I use Holly-Tone on arborvitae?
How long does it take to see results after fertilizing?
Why are my arborvitae turning yellow even after fertilizing?
Final Thoughts: The Verdict
For most people, the fertilizer for arborvitae winner is the Espoma Holly-Tone 4-3-4 because it is the most trusted organic formula, proven by tens of thousands of owners for turning acid-loving evergreens deep green with simple twice-a-year application. If you prefer a set-and-forget approach with no mixing, grab the SimplyGro Evergreen Spikes 12-3-3. For owners with a long hedge who want the best per-spike cost, the Jobe’s Bulk Spikes 160 Count is the one to reach for.
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.
As an Amazon Associate, WellFizz earns from qualifying purchases. This does not affect which products we feature.
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Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.