High-Nitrogen Canopy Builder

Best Shade Tree Fertilizer (20-10-10): High Nitrogen for Rapid Canopy Development & Dense Leaf Cover Buy on Old Cobblers Farm

Shade trees are all about the canopy. The faster they develop a broad, dense leaf canopy, the sooner they provide the shade, privacy, and property value you planted them for. This 20-10-10 delivers double the nitrogen for aggressive canopy expansion and strong caliper growth.

Updated April 2026 10 Products Compared By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Growth Shade Trees Fertilizer

by Conventional Fertilizer — Littleton, NH

20-10-10
N-P-K Ratio
"The high-nitrogen shade tree formula designed for canopy development. 20% nitrogen drives rapid leaf production, branch extension, and trunk caliper growth while balanced P and K maintain root health and structural strength."
20%
Nitrogen
40%
Total NPK
80
Max Container Trees / bag
4 Sizes
5, 10, 15, 20 lbs
🌳

20% Nitrogen for Canopy Growth

Double the nitrogen of a balanced formula. Shade trees need heavy N to produce the dense leaf canopy and rapid branch extension that defines their purpose in the landscape.

📏

Builds Trunk Caliper

Nitrogen fuels cambium activity — the growth layer that increases trunk diameter. Faster caliper growth means a structurally stronger tree that reaches landscape-size sooner.

🌱

10% P & K for Root & Structure

Phosphorus maintains root development while potassium strengthens wood, improves drought tolerance, and supports winter hardiness. Both balance the heavy nitrogen push.

📏

Container & In-Ground Rates

1 tbsp for small containers to ¼ cup for XL containers. For in-ground trees, 1 lb per inch of trunk diameter broadcast under the drip line.

📦

20–80 Container Trees Per Bag

At container rates, one 5 lb bag feeds 20–80 trees per application depending on pot size. For in-ground trees, feeds 5+ medium specimens.

📅

Every 4–6 Weeks

Feed through the growing season to sustain the nitrogen demand of rapid canopy expansion. Stop feeding 6–8 weeks before first frost to allow hardening.

✅

All Shade Tree Species

Maple, oak, birch, elm, linden, sycamore, ash, beech, sweetgum, magnolia — every shade tree benefits from high-nitrogen feeding during establishment and active growth.

🇺🇸

Trusted by 20,000+ Growers

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

NPK Ratio20-10-10
Item FormGranular
Coverage~20–80 container trees or 5+ in-ground trees per 5 lb bag
CategoryConventional Fertilizer
TypeTrees & Shrubs
Sizes5 lb | 10 lb | 15 lb | 20 lb
NPK20-10-10
Nitrogen20%
Phosphorus10% available phosphate
Potassium10% soluble potash
FormGranular
Rate1 tbsp–¼ cup (container) or 1 lb / inch diameter (in-ground)
MethodBroadcast under drip line or container rim
FrequencyEvery 4–6 weeks
Sizes5, 10, 15, 20 lb bags
Best ForMaple, oak, birch, elm, linden, all shade trees — container and in-ground
What We Love
✓ 20% nitrogen — double standard for aggressive canopy development
✓ Builds trunk caliper faster for structurally stronger trees
✓ Container and in-ground dosing rates included
✓ 20–80 container trees per bag — excellent nursery value
✓ Works for all shade tree species
Worth Noting
— High nitrogen — stop feeding 6–8 weeks before frost to allow hardening
— Not for established mature trees that need maintenance only — use 10-10-10
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
Feature Old Cobblers Farm™ Wicked Growth Shade Trees Fertilizer Old Cobblers Farm Tree Fertilizer Spikes Jobe's Tree-tone Fertilizer Espoma Organic Tree & Shrub Plant Food Spikes Miracle-Gro Root Feeder Tree & Shrub Refills Ross Tree & Shrub Protect & Feed BioAdvanced Tree & Shrub Fertilizer Dr. Earth Continuous Release Tree & Shrub Scotts Tree & Shrub Fertilizer Down To Earth Tree & Shrub Granular Jobe's Organics Shrub & Tree Fertilizer Earth Science
NPK 20-10-10 15-3-3 6-3-2 15-5-10 25-10-10 2-1-1 4-4-4 11-7-7 4-2-4 4-4-4 3-2-2
Form Granular — — — — — — — — — —
Coverage ~20–80 container trees or 5+ in-ground trees per 5 lb bag Not listed Not listed Not listed Not listed Not listed Not listed Not listed Not listed Not listed Not listed
Price / Size 5 lb | 10 lb | 15 lb | 20 lb $10-$20 $12-$45 $15-$18 $15-$30 $25-$45 $15-$35 $15 $18-$60 $10-$16 $13-$16
Our Take The high-nitrogen shade tree formula designed for canopy developmen... — — — — — — — — — —
The Competition

Tree Fertilizer Spikes

by Jobe's
15-3-3
N-P-K
Sizes5-15 pk
Price$10-$20

Tree-tone Fertilizer

by Espoma Organic
6-3-2
N-P-K
Sizes4-36 lb
Price$12-$45

Tree & Shrub Plant Food Spikes

by Miracle-Gro
15-5-10
N-P-K
Sizes12 pk
Price$15-$18

Root Feeder Tree & Shrub Refills

by Ross
25-10-10
N-P-K
Sizes12-54 pk
Price$15-$30

Tree & Shrub Protect & Feed

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

Tree & Shrub Fertilizer

by Dr. Earth
4-4-4
N-P-K
Sizes4 lb, 12 lb
Price$15-$35

Continuous Release Tree & Shrub

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

Tree & Shrub Fertilizer

by Down To Earth
4-2-4
N-P-K
Sizes5 lb, 25 lb
Price$18-$60

Tree & Shrub Granular

by Jobe's Organics
4-4-4
N-P-K
Sizes1.5 lb, 4 lb
Price$10-$16

Shrub & Tree Fertilizer

by Earth Science
3-2-2
N-P-K
Sizes2.5 lb
Price$13-$16

🌳

20% Nitrogen for Canopy Growth

Double the nitrogen of a balanced formula. Shade trees need heavy N to produce the dense leaf canopy and rapid branch extension that defines their purpose in the landscape.

📏

Builds Trunk Caliper

Nitrogen fuels cambium activity — the growth layer that increases trunk diameter. Faster caliper growth means a structurally stronger tree that reaches landscape-size sooner.

🌱

10% P & K for Root & Structure

Phosphorus maintains root development while potassium strengthens wood, improves drought tolerance, and supports winter hardiness. Both balance the heavy nitrogen push.

📏

Container & In-Ground Rates

1 tbsp for small containers to ¼ cup for XL containers. For in-ground trees, 1 lb per inch of trunk diameter broadcast under the drip line.

Common Questions