Fertilizer is one of the most misunderstood parts of plant care.

Many homeowners assume fertilizing immediately after planting will help a tree or shrub grow faster or establish more successfully. In reality, overfertilizing — especially too soon after planting — is one of the most common causes of plant stress we see.

The truth is, most newly planted trees and shrubs benefit far more from proper watering and root establishment than aggressive fertilizing.

In many cases, less is more.

Before fertilizing, we also recommend reading our companion guides:

→ Simply Trees Guide to Planting
→ Simply Trees Guide to Watering

Proper planting depth, drainage, watering habits, and root establishment all directly affect how plants respond to fertilizer.

A Quick Note Before You Fertilize

Most of our plants and trees already contain a slow-release fertilizer blended into the soil from the grower.

Because of this, additional fertilizer is usually not needed right away — especially after planting.

Newly planted trees and shrubs are already adjusting to:

• new soil
• new temperatures
• watering changes
• sunlight differences
• and transplant stress

Adding more fertilizer too soon can overwhelm sensitive roots and create unnecessary stress.

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More fertilizer does not mean a healthier plant. In many cases, overfertilizing causes far more problems than underfertilizing.

Most Common Fertilizing Mistakes

Before we dive in, these are the most common fertilizer-related problems we see:

Fertilizing Immediately After Planting

Fresh roots are sensitive and still adjusting to their new environment.

Using Too Much Fertilizer

More fertilizer does not mean faster or healthier growth.

Fertilizing a Stressed Plant

A stressed plant is not always a hungry plant.

Fertilizing at the Wrong Time of Year

Late-season fertilizing can encourage vulnerable new growth before cold weather.

Using Harsh High-Nitrogen Fertilizers

Aggressive fertilizers can burn roots and force weak, stressed growth.

Newly Planted Trees & Shrubs Should NOT Be Fertilized Right Away

One of the biggest mistakes homeowners make is fertilizing immediately after planting.

Freshly planted trees and shrubs are focused on root establishment — not rapid top growth.

Applying fertilizer too soon can:

• stress sensitive roots
• burn newly establishing roots
• increase transplant shock
• force weak top growth before the plant is established
• worsen overall plant stress

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One of the #1 causes of severe transplant stress we see is fertilizing too soon after planting.

When Should You Fertilize?

We generally recommend waiting at least 2–3 months after planting before considering fertilizer.

Even then, fertilizer should only be applied once:

• the plant is actively establishing
• new growth appears healthy
• watering is consistent
• the plant is no longer under visible transplant stress
• the season is right

In many cases, newly planted trees and shrubs do perfectly fine without fertilizer during their first season.

The Best Time to Fertilize

The safest time to fertilize most outdoor trees and shrubs is:

• spring
• early summer

This is when plants are actively growing and able to properly utilize nutrients.

We do NOT recommend fertilizing in:

• fall
• winter

Late-season fertilizing can encourage tender new growth that may become damaged by cold weather or freezing temperatures.

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Fertilizer encourages growth. You want plants actively growing — not preparing for dormancy — when fertilizer is applied.

Most Established Landscape Trees Need Less Fertilizer Than People Think

Many established landscape trees and shrubs can thrive for years with little to no fertilizer once established in healthy soil.

Overfertilizing is far more common in home landscapes than underfertilizing.

In most cases:

• proper watering
• healthy soil
• mulching
• sunlight
• and good drainage

matter far more than frequent fertilizing.

Certain Plants Benefit More From Fertilizing

Some plants naturally use nutrients faster and may benefit from occasional feeding during the growing season.

These commonly include:

• citrus trees
• potted patio plants
• roses
• flowering annuals
• heavy fruit producers

Container-grown plants especially lose nutrients faster because watering gradually flushes nutrients from the soil.

Citrus Trees

Citrus trees are heavier feeders than many landscape trees and often benefit from periodic fertilizing during active growth.

However:

• citrus should still NOT be fertilized immediately after planting
• overfertilizing citrus can still cause stress or root damage
• proper watering remains more important than fertilizer

Organic & Slow-Release Fertilizers Are Usually Best

For most homeowners, gentle organic or slow-release fertilizers are the safest option.

These fertilizers:

• release nutrients more gradually
• reduce the risk of root burn
• encourage steadier growth
• are generally easier on newly establishing plants

Aggressive synthetic or high-nitrogen fertilizers are much more likely to cause stress if misused.

A Stressed Plant Is Not Always a Hungry Plant

This is one of the most important things to understand.

If your tree or shrub:

• recently shipped
• was newly planted
• experienced heat stress
• dropped leaves
• looks wilted
• or is adjusting to a new environment

fertilizer is usually NOT the first solution.

In fact, fertilizing a stressed plant often makes the problem worse.

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Newly planted trees and shrubs need healthy roots first — not forced rapid growth.

What Fertilizer Burn Looks Like

Overfertilizing can damage roots and stress plants quickly.

Common signs of fertilizer burn include:

• crispy brown leaf edges
• sudden browning
• yellowing leaves
• leaf drop
• weak or floppy growth
• blackened roots
• rapid decline after feeding

If fertilizer stress occurs:

• stop fertilizing
• focus on proper watering
• allow the plant time to recover

How to Fix Fertilizer Burn

If you recently fertilized your plant and started noticing crispy leaf edges, yellowing, browning, leaf drop, or sudden decline, fertilizer burn may be the cause.

The good news: if the roots are not severely damaged, many plants can recover with the right care and a little patience.

Step 1: Stop Fertilizing Immediately

Do not apply any more fertilizer, plant food, compost tea, or nutrient products until the plant has fully recovered.

Adding more nutrients will only increase stress.

Step 2: Remove Visible Fertilizer

If you see fertilizer granules on top of the soil, gently remove as much as possible by hand.

Be careful not to disturb the rootball too aggressively.

Step 3: Water Deeply to Help Flush Excess Salts

Water the soil slowly and deeply to help move excess fertilizer salts away from the root zone.

For in-ground plants, water slowly at the base of the plant so moisture moves down through the rootball and surrounding soil.

For container plants, water until excess water drains freely from the bottom of the pot. Make sure the container is not sitting in standing water afterward.

Step 4: Make Sure the Soil Can Drain

Flushing only helps if water can move through the soil.

If the soil stays soggy, heavy, or compacted, the roots may become even more stressed.

Healthy recovery requires moisture and oxygen.

Step 5: Do Not Prune Heavily Right Away

Avoid heavy pruning immediately after fertilizer burn.

Damaged leaves may look rough, but if they still have some green tissue, they may still be helping the plant photosynthesize.

You can remove fully dead, crispy, or blackened foliage once you’re sure it is no longer contributing to the plant.

Step 6: Protect the Plant From Extra Stress

While recovering, avoid adding more stress from:

• more fertilizer
• harsh pruning
• overwatering
• transplanting again
• intense reflected heat
• unnecessary soil disturbance

Focus on steady moisture, good drainage, and time.

Step 7: Be Patient

Fertilizer burn recovery is not instant.

Damaged leaves usually will not turn green again, but healthy new growth may appear once the plant stabilizes.

Depending on the plant, season, and severity, recovery can take several weeks or longer.

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After fertilizer burn, the goal is not to force new growth. The goal is to help the roots recover.

Healthy roots first. New growth later.

Important Note: These Symptoms Do Not Always Mean Fertilizer Burn

Crispy brown leaf edges, sudden browning, yellowing leaves, leaf drop, weak or floppy growth, blackened roots, and general decline can sometimes be signs of fertilizer burn — especially if symptoms appear shortly after feeding.

However, these symptoms can also be caused by other issues, including:

• underwatering
• overwatering
• poor drainage
• transplant shock
• heat stress
• cold damage
• root damage
• planting too deep
• shipping stress

If you have not recently fertilized your plant, fertilizer burn is likely not the cause. Check watering, drainage, planting depth, sunlight, and recent weather conditions before assuming fertilizer damage.

What About MitoGrow?

MitoGrow is different from traditional fertilizer.

It’s a biostimulant, not a fertilizer.

While fertilizers directly feed plants with nutrients, biostimulants help plants utilize nutrients and manage stress more efficiently.

Think of it more like a supplement that supports healthier growth, stronger resilience, and improved nutrient efficiency.

MitoGrow can be used on:

• indoor plants
• outdoor plants
• trees
• shrubs
• container plants

Can You Use MitoGrow With Fertilizer?

Yes — and we actually recommend it.

MitoGrow is designed to work alongside fertilizer by helping plants utilize nutrients more efficiently and better manage environmental stress.

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MitoGrow supports the plant itself — it does not replace proper watering, drainage, or healthy planting practices.

Less Is More

One of the healthiest things you can do for many plants is avoid overcomplicating their care.

Plants do not need constant fertilizing to thrive.

In many cases, homeowners accidentally create stress by:

• fertilizing too frequently
• fertilizing too aggressively
• or fertilizing at the wrong time

Healthy roots, proper watering, good drainage, and patience are usually far more important.

Final Thoughts

When it comes to fertilizer, more is not better.

Focus first on:

• proper planting
• healthy root establishment
• consistent watering
• seasonal timing
• and patience

Most plants establish best when they’re allowed to settle naturally into their new environment before being pushed into aggressive growth.

A healthy root system is always the priority.