Arborvitae trees respond best to a single early-spring application of balanced slow-release fertilizer like 10-10-10 or 20-15-15, though established trees in regularly fertilized lawns often need no extra feeding at all.
The right arborvitae fertilizer recommendation depends on soil condition, tree age, and whether your trees already get lawn food. Fertilize too late and that tender new growth gets killed by the first freeze. The working schedule, the exact products that won’t burn your evergreens, and the application methods that actually deliver nutrients to the roots are all below.
When To Fertilize Arborvitae: The Two-Window Rule
Early spring — March through April, just before new growth starts — is the primary one. Late fall, after leaf drop and no earlier than mid-September, is the secondary option for trees that need a second boost. Fertilizing in late summer or after the first day of summer forces growth that won’t harden off before winter, which means frost damage on every branch tip. UConn’s arborvitae factsheet confirms that late-season nitrogen is the most common mistake homeowners make.
What NPK Ratio Works Best For Arborvitae?
Arborvitae needs a higher-nitrogen or balanced formula for healthy foliage and strong root development. Any of these work; the choice depends more on whether you prefer granular slow-release or liquid fast-feeding. Granular slow-release is the standard recommendation for a single yearly application because it meters nutrients out across the growing season. Liquid formulas feed faster and work better for young trees or for trees that need a visible green-up within weeks.
Specific Arborvitae Fertilizer Products That Deliver
Three product categories cover every arborvitae situation. The table below shows what each does best and when to use it.
| Product Type | Best For | Key Specs / Application |
|---|---|---|
| Espoma Plant-tone (granular organic) | Feeding the soil, not forcing the plant. Safest option for delicate evergreens; lowest burn risk. | Organic slow-release; broadcast over root zone. Safe near trunk if kept 6–8 inches away. |
| Perfect Plants Liquid Arborvitae Fertilizer | Young trees, newly planted trees that need root establishment, or a quick seasonal kick. | 8 oz bottle: 2 tsp per gallon for new plants. 1 qt bottle: 2 tbsp per gallon for established trees. Apply weekly during active growth. |
| Miracle-Gro Water Soluble (hose-attach) | Fast green-up for mature trees that need a mid-season boost. | Use at half strength for arborvitae; apply with watering every 2–3 weeks during spring and summer only. |
| Golfgreen Tree and Hedge Feeder (18-8-8) | Granular option for dense hedges and privacy screens where uniform growth matters. | 2 lbs per 100 sq ft of root zone. Apply early spring only. |
| Multi Purpose 10-10-10 (granular) | Budget-friendly balanced feed for established trees in poor soil. | 1 lb per 100 sq ft. Water thoroughly after application. |
| Holly-tone (granular acidifying) | Arborvitae planted near acid-loving shrubs. Slightly acidic formulation. | Follow bag rate for evergreens. Use half rate next to lawn fertilized areas. |
How To Apply Arborvitae Fertilizer Step By Step
The exact method depends on whether you choose granular or liquid, but the trunk-distance rule never changes. Keep any fertilizer at least 6–8 inches from the trunk. Trunk contact causes root and trunk burn every time.
Granular Application — The Broadcast Method
Remove mulch from the drip line — the circle under the outer edge of the branches — or sprinkle fertilizer just outside the drip line if removing mulch from every tree is impractical. Broadcast the granules evenly over the entire root zone at the rate of 1 to 2 lbs per 100 square feet. Water thoroughly immediately after application, either by hose or by timing it right before a good rainfall. The water dissolves the granules and carries nitrogen down to the root zone where it matters.
Granular Application — The Hole Method
For large trees or soil that runs off easily, drill 6-inch-deep holes spaced evenly around the drip line. Fill each hole one-third full with fertilizer, then top the rest with soil. This method puts nutrients directly at root depth and reduces runoff.
Liquid Application For Young Trees
Mix the liquid concentrate per the bottle instructions — 2 tsp per gallon for new plantings with the 8 oz Perfect Plants bottle, or 2 tbsp per gallon for established trees with the quart size. Pour the mixture directly at the base, not on the foliage. Apply weekly during active growth from late April through mid-July. For fall, drop to every 3–4 weeks and stop entirely a month before the first frost.
When Arborvitae Does NOT Need Fertilizer
This is the most overlooked piece of the arborvitae fertilizer recommendation: established trees growing in a regularly fertilized lawn already get enough nutrients from the lawn feed. Adding extra fertilizer on top of lawn food can push nitrogen levels high enough to burn roots and trigger weak, disease-prone growth. Also skip fertilizer for trees that are drought-stressed or newly planted. A newly planted arborvitae lacks the root system to absorb fertilizer; it needs consistent water, not nutrients, for the first full growing season.
If your trees look healthy and green, skip the bag. If the foliage is pale, growth is slower than expected, or lower branches are thinning, run a soil test first. The UConn factsheet recommends testing pH before any chemical application. If your pH is already in range, nitrogen is likely the only missing element.
Common Arborvitae Fertilizer Mistakes That Cost You The Tree
| Mistake | What Happens | How To Avoid It |
|---|---|---|
| Fertilizing in late summer | New growth that can’t harden off before winter. Entire branch tips turn brown by December. | Do not resume until March. |
| Fertilizer touching the trunk | Root burn, trunk lesions, dieback on one side of the tree. | Keep granules 6–8 inches from the trunk at all times. |
| Fertilizing newly planted trees | Slowed root establishment. The tree focuses on foliage instead of roots. | Water deeply instead. |
| Applying fertilizer during drought | Chemical burn to already-stressed roots. Dead branches appear within two weeks. | |
| Mixing bagged organic matter into the planting hole | Roots circle inside the amended soil and fail to spread into native soil. | Backfill with native soil only. No bagged compost, no potting mix. |
The Right Arborvitae Feeding Schedule By Season
One granular application in March or April covers an entire year for most trees. If you prefer liquid, use this schedule: late April through mid-July, apply weekly at the diluted rate. Stop one month before your local first frost date. Resume in spring. Trees in poor soil can get a second granular feeding in early fall — but only if you use a slow-release formula and stay ahead of frost by at least six weeks.
For readers ready to buy the right product, our tested roundup of the best arborvitae fertilizers includes detailed comparisons and application notes for each pick.
FAQs
Can I use a 20-20-20 fertilizer on arborvitae?
Yes, a 20-20-20 balanced formula works well for arborvitae, but it is a strong synthetic that must be watered in immediately. Use it at half the recommended rate for the first application to avoid root burn, and never apply it to drought-stressed or newly planted trees.
How long should I wait after planting before fertilizing?
Skip fertilizer entirely during the first growing season. Newly planted arborvitae need time to establish roots, and applying fertilizer too early can inhibit root development. Start a light liquid feeding the following spring at half the label rate.
Will Epsom salt help my arborvitae grow taller?
Epsom salt supplies magnesium and sulfur, not nitrogen. Arborvitae usually get enough magnesium from typical soil. If a soil test confirms a magnesium deficiency, Epsom salt can help — but it will not push growth the way a balanced nitrogen fertilizer will.
Can I fertilize arborvitae in winter?
No. Fertilizing in winter is useless because the tree is dormant and cannot absorb nutrients. Any nitrogen applied will leach through the soil or run off before the roots wake up in spring. Wait until the ground thaws and new buds begin swelling.
Is liquid or granular fertilizer better for arborvitae?
Granular slow-release is better for a single yearly feeding because it meters nutrients across the season. Liquid is better for young trees that need a quick green-up or for trees showing nitrogen deficiency mid-season. Many experienced growers use granular in spring and supplement with liquid if the trees look pale by June.
References & Sources
- Perfect Plants Nursery. “Liquid Arborvitae Fertilizer” Product details, mixing rates, and application schedule for liquid feeding.
- University of Connecticut Home & Garden. “Arborvitae Factsheet” Covers pH range, sunlight needs, safe application distance, and why established lawn trees may not need fertilizer.
- Hawks Landscape. “Arborvitae Pruning, Winter Care and Fertilizing” Provides hole-method application rates and the 2 lbs per inch rule.
- Lawn Gear Lab. “Best Fertilizer For Arborvitae – Product Roundup” Tested product comparisons with detailed application notes.
- Humico. “Best Fertilizer for Arborvitae Trees” Covers NPK recommendations, timing windows, and common fertilizing mistakes.