Balanced + Iron for Deep Green

Best Evergreen Fertilizer (10-10-10 + Iron): Balanced NPK with Iron to Prevent Yellowing & Maintain Deep Green Foliage Buy on Old Cobblers Farm

Updated April 2026 By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Growth Evergreen Fertilizer

by Wicked Growth — Littleton, NH

10-10-10
N-P-K Ratio
"The evergreen-specific formula with balanced NPK plus supplemental iron. Iron sulfate prevents chlorosis (yellowing) in alkaline soils while balanced nutrition supports steady growth, strong root systems, and dense, attractive foliage year-round."
10-10-10
Balanced NPK
+ Iron
Chlorosis Prevention
50 ft
Drip line tree / bag
4 Sizes
5, 10, 15, 20 lbs
🌲

Iron Prevents Yellowing

Supplemental iron addresses iron chlorosis — the most common cause of yellowing needles in pines, spruces, and arborvitae, especially in alkaline or high-pH soils.

🌿

Deep Green Foliage Year-Round

Iron boosts chlorophyll production for the rich, dark green color that defines healthy evergreens. Visible improvement in needle color within weeks of application.

⚖️

Balanced 10-10-10 Base

Equal NPK supports steady growth without the flush of soft new growth that makes evergreens vulnerable to winter burn and snow damage.

📏

Drip Line Dosing

1 lb per 10 ft of drip line diameter. Simple measurement — stand under the tree, pace the canopy edge, and apply accordingly.

❄️

Winter Hardiness Support

Potassium strengthens cell walls and regulates water in needles and wood, reducing winter desiccation and frost damage — critical for exposed evergreens in cold climates.

📅

Spring + Early Summer

Feed in early spring as growth resumes and optionally again in early summer. Stop by mid-summer so new growth hardens before winter.

✅

All Evergreen Species

Pines, spruces, arborvitae, hollies, junipers, yews, hemlocks, firs, cedars, boxwood — every evergreen benefits from balanced feeding with iron.

🇺🇸

Trusted by 20,000+ Growers

Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.

NPK Ratio10-10-10
Derived FromUrea (10–20%), Diammonium Phosphate (10–20%), Potassium Chloride / Muriate of Potash (40–50%), Silicon Dioxide (4–53%)
Item FormGranular
Release SpeedModerate-release
Application Rate1 lb / 10 ft drip line diameter | 2–3 lbs / 100 sq ft (hedge rows)
MethodBroadcast under drip line or along hedge row
Frequency1–2x per season (early spring + early summer)
Sizes5 lb | 10 lb | 15 lb | 20 lb
SupportsPines, spruces, arborvitae, hollies, junipers, yews, hemlocks, firs, cedars, boxwood
SetupsLandscape plantings, windbreaks, hedgerows, foundation plantings, specimen trees
What We Love
✓ Supplemental iron prevents and corrects needle yellowing (chlorosis)
✓ Balanced NPK supports steady, controlled evergreen growth
✓ Drip line dosing — simple per-tree application
✓ Potassium improves winter hardiness in cold climates
✓ Works for all evergreen species — pines, spruces, arborvitae, hollies
Worth Noting
— Iron may stain concrete and stone surfaces — apply carefully near hardscape
— Granular only — no liquid option
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
Feature Old Cobblers Farm™ Wicked Growth Evergreen Fertilizer Holly-tone Fertilizer Water Soluble Miracid Evergreen Fertilizer Spikes Evergreen, Flowering Tree & Shrub Acid Lovers Organic Fertilizer Acid Mix Fertilizer Tree and Shrub Food 12 Month Tree & Shrub Protect Tree, Shrub & Evergreen Fertilizer Acid Lovers Plant Food
NPK 10-10-10 4-3-2004 30-10-10 11-3-2004 11-7-2007 4-3-2006 4-3-2006 19-8-10 2-1-2001 16-4-8 4-5-2004
Phosphorus 10.0% 3.0% 10.0% 3.0% 7.0% 3.0% 3.0% 8.0% 1.0% 4.0% 5.0%
Potassium 10.0% 4.0% 10.0% 4.0% 7.0% 6.0% 6.0% 10.0% 1.0% 8.0% 4.0%
Form Granular
Sizes 5 lb | 10 lb | 15 lb | 20 lb 4-36 lb 1 lb, 4 lb 9-160 pk 3 lb 4 lb, 12 lb 5 lb, 25 lb 4 lb, 20 lb 4 lb, 10 lb 3.5 lb, 16 lb 4 lb
Release Speed Moderate-release
The Competition

Holly-tone Fertilizer

by Espoma Organic
4-3-2004
N-P-K
Sizes4-36 lb
Price$10-$40

Water Soluble Miracid

by Miracle-Gro
30-10-10
N-P-K
Sizes1 lb, 4 lb
Price$8-$20

Evergreen Fertilizer Spikes

by Jobe's
11-3-2004
N-P-K
Sizes9-160 pk
Price$10-$35

Evergreen, Flowering Tree & Shrub

by Scotts
11-7-2007
N-P-K
Sizes3 lb
Price$12-$15

Acid Lovers Organic Fertilizer

by Dr. Earth
4-3-2006
N-P-K
Sizes4 lb, 12 lb
Price$15-$30

Acid Mix Fertilizer

by Down To Earth
4-3-2006
N-P-K
Sizes5 lb, 25 lb
Price$16-$60

Tree and Shrub Food

by Ferti-lome
19-8-10
N-P-K
Sizes4 lb, 20 lb
Price$15-$40

12 Month Tree & Shrub Protect

by BioAdvanced
2-1-2001
N-P-K
Sizes4 lb, 10 lb
Price$25-$45

Tree, Shrub & Evergreen Fertilizer

by Vigoro
16-4-8
N-P-K
Sizes3.5 lb, 16 lb
Price$10-$25

Acid Lovers Plant Food

by True Organic
4-5-2004
N-P-K
Sizes4 lb
Price$14-$16

🌲

Iron Prevents Yellowing

Supplemental iron addresses iron chlorosis — the most common cause of yellowing needles in pines, spruces, and arborvitae, especially in alkaline or high-pH soils.

🌿

Deep Green Foliage Year-Round

Iron boosts chlorophyll production for the rich, dark green color that defines healthy evergreens. Visible improvement in needle color within weeks of application.

⚖️

Balanced 10-10-10 Base

Equal NPK supports steady growth without the flush of soft new growth that makes evergreens vulnerable to winter burn and snow damage.

📏

Drip Line Dosing

1 lb per 10 ft of drip line diameter. Simple measurement — stand under the tree, pace the canopy edge, and apply accordingly.

Common Questions