Can You Fertilize Arborvitae In The Summer

Yes, you can fertilize arborvitae in the summer, but you have to do it carefully and at the right time.
 
Many homeowners wonder if they can fertilize arborvitae in the summer without harming the tree.
 
The short answer is that summer fertilization is possible, but it’s not always necessary.
 
Arborvitae have specific growth cycles, and feeding them at the wrong moment can lead to problems.
 
In this post, we’ll explore whether you can fertilize arborvitae in the summer, the best methods to use, and when to avoid it.
 
Let’s dig in and get those trees healthy.
 

Why You Can Fertilize Arborvitae in the Summer

Fertilizing arborvitae in the summer can be beneficial under the right conditions.
 
Here’s why it works and when it makes sense.
 

1. Summer Is a Period of Active Growth

Arborvitae experience a flush of growth in late spring and early summer.
 
During this time, they’re actively producing new foliage and roots.
 
So if you can fertilize arborvitae in the summer while they’re still growing, you’re providing nutrients when they’re most needed.
 
This can result in denser, greener foliage and stronger branches.
 

2. Corrects Nutrient Deficiencies Quickly

Sometimes your soil lacks essential nutrients like nitrogen, phosphorus, or potassium.
 
Signs of deficiency include yellowing leaves or stunted growth.
 
If you notice these issues in midsummer, you can fertilize arborvitae in the summer to correct them fast.
 
A quick-acting fertilizer can revive a struggling tree within a few weeks.
 

3. Supports Recovery After Stress

Heat waves, drought, or insect damage can stress arborvitae.
 
A gentle summer feeding helps the tree recover and regrow lost foliage.
 
Just remember that you can fertilize arborvitae in the summer only if the tree is well-watered first.
 
Never fertilize a drought-stressed tree; water deeply a day or two before applying fertilizer.
 

Best Practices for Summer Fertilization of Arborvitae

To do it right, follow these summer-specific guidelines.
 
They’ll help you avoid burning roots or forcing unwanted growth.
 

1. Choose a Slow-Release or Low-Nitrogen Fertilizer

Fast-release fertilizers with high nitrogen can cause a burst of tender new growth.
 
That new growth is vulnerable to heat and pests.
 
Instead, when you decide to fertilize arborvitae in the summer, pick a slow-release formula.
 
Look for something like 10-8-6 or 12-6-6, which releases nutrients gradually.
 

2. Apply Early or Late in the Day

Hot summer sun can intensify fertilizer salts and burn roots.
 
The best time to fertilize arborvitae in the summer is early morning or late evening.
 
This gives the soil time to absorb moisture before the heat peaks.
 
Water thoroughly after application to help nutrients penetrate.
 

3. Avoid Fertilizing During Extreme Heat

If temperatures are above 90°F (32°C), hold off.
 
When you fertilize arborvitae in the summer during a heat wave, the roots can’t take up nutrients effectively.
 
Wait for a cooler spell, or wait until early fall if your area stays hot.
 

4. Use Liquid Fertilizer for a Gentle Boost

Liquid fertilizers are absorbed quickly and are less likely to burn.
 
This is a great option if you want to fertilize arborvitae in the summer without shocking the plant.
 
Follow the label instructions and dilute to half-strength to be safe.
 

Signs Your Arborvitae Needs Summer Fertilizer

Not every arborvitae needs a summer feeding.
 
Look for these clues that tell you it’s time.
 

1. Pale or Yellowing Foliage

If the inner leaves turn yellow while new growth is still green, it likely lacks nitrogen.
 
This is a clear signal that you can fertilize arborvitae in the summer to restore color.
 
Avoid overdoing it; one light application is usually enough.
 

2. Slow Growth Compared to Previous Years

Arborvitae normally grow 6–12 inches per year.
 
If yours isn’t putting on new growth by midsummer, a dose of fertilizer may help.
 
But first check soil moisture and drainage.
 

3. Soil Test Shows Low Nutrients

The most reliable way to know if you should fertilize arborvitae in the summer is a soil test.
 
Home test kits are cheap and easy to use.
 
If nitrogen or potassium is low, summer fertilization makes sense.
 
If nutrients are adequate, skip it.
 

When NOT to Fertilize Arborvitae in the Summer

Sometimes you should avoid summer feeding altogether.
 
Here are situations where you should wait.
 

1. Late Summer (August–September)

Fertilizing too late in summer encourages new growth that won’t harden off before winter.
 
That tender growth can be killed by frost.
 
So if you can fertilize arborvitae in the summer, do it by mid-July at the latest.
 

2. During Drought or Water Restrictions

Without enough water, fertilizer can’t be absorbed and may burn roots.
 
If your area is in a drought, do not fertilize arborvitae in the summer.
 
Focus on deep watering instead.
 

3. If Your Arborvitae Are Already Growing Well

If your trees are deep green and putting on healthy new shoots, extra feeding is unnecessary.
 
Over-fertilizing can lead to leggy growth and increased pest problems.
 

So, Can You Fertilize Arborvitae in the Summer?

Yes, you can fertilize arborvitae in the summer, but only with careful timing and the right products.
 
Stick to slow-release or liquid fertilizers, apply during cooler parts of the day, and stop by mid-July.
 
Always water well before and after feeding to prevent root burn.
 
If your arborvitae show signs of deficiency or stress, a summer feeding can work wonders.
 
But if they’re happy and healthy, let them be.
 
Hope this helps you decide when and how to fertilize arborvitae in the summer for best results.