Growing healthy citrus trees takes more than sunshine and water. Lemon, lime, orange, grapefruit, mandarin, and other citrus trees are relatively heavy feeders, and the right citrus tree fertilizer can make a noticeable difference in growth, leaf color, flowering, fruit production, and overall tree health.
That is especially true here in Texas, where citrus trees may have to deal with intense summer heat, periods of drought, unpredictable winter temperatures, and soils that don’t always provide nutrients in a form citrus roots can easily use.
Fortunately, fertilizing citrus trees doesn’t have to be complicated.
Once you understand what nutrients citrus trees need, when to feed them, and how to recognize common deficiencies, developing a fertilizer schedule becomes much easier.
In this guide, we’ll cover:
- The best fertilizer for citrus trees
- What NPK ratio citrus trees need
- When to fertilize citrus trees
- How often citrus trees should be fertilized
- Fertilizing lemon, lime, and orange trees
- Fertilizing citrus trees growing in containers
- Organic citrus fertilizers
- Homemade citrus tree fertilizer options
- Coffee grounds, Epsom salt, eggshells, and other popular garden amendments
- Nutrient deficiencies that cause yellow citrus leaves
- Citrus tree fertilizer tips for Texas gardeners
- Common fertilizing mistakes to avoid
Whether you’re growing a Meyer lemon in a patio container or an orange tree in the backyard, proper feeding can help your citrus tree become stronger and more productive.
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Why Citrus Trees Need Fertilizer
Table of Contents
Citrus trees use considerable amounts of nutrients to produce their leaves, branches, flowers, roots, and fruit.
Unlike ornamental plants grown primarily for foliage, a productive citrus tree has to support several processes simultaneously.
During the growing season, your tree may be:
- Producing new leaves
- Growing branches
- Developing roots
- Flowering
- Setting fruit
- Enlarging fruit
- Replacing nutrients removed from the soil
All of that requires nutrients.
Nitrogen is particularly important because citrus trees maintain a large amount of evergreen foliage.
But nitrogen isn’t the only consideration.
Healthy citrus trees also need phosphorus, potassium, and several micronutrients.
Depending on the soil and growing conditions, citrus can show deficiencies involving nutrients such as:
- Nitrogen
- Magnesium
- Iron
- Zinc
- Manganese
That’s one reason a fertilizer formulated specifically for citrus trees can be useful.
What Is the Best Fertilizer for Citrus Trees?
The best citrus tree fertilizer generally provides plenty of nitrogen along with potassium, phosphorus, and important micronutrients.
When shopping for fertilizer, look for products labeled for:
- Citrus
- Citrus and avocado
- Fruit trees
- Citrus and fruit trees
A citrus-specific fertilizer is often preferable because manufacturers may include micronutrients citrus trees commonly need.
The exact fertilizer analysis isn’t as important as using an appropriate product correctly.
Avoid assuming that more fertilizer automatically means more fruit.
Too much fertilizer can cause problems of its own.
Understanding Citrus Tree Fertilizer NPK
You’ll see three numbers printed on fertilizer packages.
For example:
6-4-6
or
8-3-9
These numbers represent the percentage by weight of:
N – Nitrogen
P – Phosphate
K – Potash
Each plays a different role in plant growth.
Nitrogen
Nitrogen supports vigorous vegetative growth and green foliage.
Citrus trees require a significant amount of nitrogen compared with many landscape plants.
A tree deficient in nitrogen may develop pale green or yellow foliage and weak growth.
Phosphorus
Phosphorus is involved in processes including root development and energy transfer within the plant.
Most citrus trees don’t need enormous amounts of phosphorus added indiscriminately.
Soil testing is useful when determining whether additional phosphorus is necessary.
Potassium
Potassium plays an important role in overall plant function and fruit development.
Fruit-producing citrus trees can have substantial potassium requirements.
Micronutrients for Citrus Trees
The three fertilizer numbers receive most of the attention, but micronutrients shouldn’t be overlooked.
Citrus trees can develop very noticeable symptoms when certain micronutrients become unavailable.
A quality citrus fertilizer may contain nutrients such as:
- Iron
- Zinc
- Manganese
- Magnesium
Micronutrient availability can also depend on soil pH.
That means adding more fertilizer isn’t always the solution.
Sometimes nutrients are already present in the soil but aren’t readily available to the plant.
When to Fertilize Citrus Trees
Citrus trees should generally receive most of their fertilizer while they are actively growing.
Instead of dumping an entire year’s fertilizer around the tree at once, dividing the appropriate yearly amount into multiple applications is often a better strategy.
A basic growing-season approach might involve feeding around:
Early spring
Feed as active growth begins.
Late spring
A second application can support continued growth and fruit development.
Early to midsummer
Depending on your fertilizer, climate, tree age, and label instructions, another application may be appropriate.
Avoid automatically pushing tender new growth late in the season where winter freezes are a concern.
Always follow the directions on your particular fertilizer.
Citrus Tree Fertilizer Schedule for Texas
Texas presents some unique challenges for citrus growers.
The appropriate schedule depends considerably on where you live.
South Texas and the Rio Grande Valley have very different winter conditions from North and East Texas.
In areas where freezes are possible, gardeners should be cautious about encouraging a large flush of tender growth late in the season.
For many home growers, the majority of feeding should therefore occur during spring and summer while the tree is actively growing.
A simple approach is:
Early spring: Begin feeding when active growth resumes.
Late spring: Make the next scheduled feeding according to your fertilizer label.
Early/midsummer: Continue feeding if appropriate for the product and tree.
Late summer/fall: Be more conservative where encouraging tender new growth could increase freeze vulnerability.
Your fertilizer label and local growing conditions should always take priority over a generic calendar.
Fertilizing Citrus Trees in East Texas
Growing citrus in East Texas can be rewarding, but it presents challenges.
Hot summers aren’t usually the biggest problem.
Winter cold is.
Many citrus varieties are vulnerable to freezing temperatures, so gardeners often grow more cold-tolerant varieties or keep citrus trees in containers that can be protected during winter.
East Texas soils can also vary considerably from one property to another.
Rather than guessing about soil fertility, a soil test is one of the best tools available.
A soil test can help determine:
- Soil pH
- Existing nutrient levels
- Whether certain fertilizer additions are actually necessary
This becomes especially useful if your citrus tree has yellow leaves despite regular fertilization.
How to Fertilize a Citrus Tree
Applying fertilizer correctly is just as important as choosing the fertilizer.
Don’t dump concentrated fertilizer directly against the trunk.
The active feeder roots extend outward into the soil.
Spread granular fertilizer evenly over the appropriate root zone according to the product label.
Keep fertilizer away from direct contact with the trunk.
After applying granular fertilizer, watering appropriately can help move nutrients into the root zone.
Never exceed the fertilizer label’s recommended application rate.
Fertilizing Young Citrus Trees
Newly planted citrus trees need different treatment from large established trees.
The goal with a young citrus tree is steady, healthy development.
You don’t need to force extremely rapid growth.
Once the tree is established and actively growing, smaller fertilizer applications according to label recommendations can support development.
As the tree gets larger, its nutritional requirements increase.
Always base application rates on the manufacturer’s directions for tree size or age.
Fertilizing Mature Citrus Trees
Mature fruit-producing trees generally require more nutrients than small young trees.
They have:
- Larger root systems
- More foliage
- More branches
- More flowers
- Larger fruit crops
However, mature trees still shouldn’t be fertilized blindly.
Watch the tree.
Healthy citrus foliage should generally have good color and the tree should produce reasonable new growth.
Excessive fertilizer isn’t necessarily beneficial.
Best Fertilizer for Lemon Trees
Lemon trees are vigorous growers and respond well to regular nutrition during their active growing season.
A citrus fertilizer containing nitrogen plus appropriate micronutrients is usually a good choice.
Meyer lemons are particularly popular with home gardeners because they grow well in containers.
Container-grown Meyer lemons require slightly different fertilizer management because nutrients can wash from potting mix during regular watering.
Best Fertilizer for Orange Trees
Orange trees have similar basic nutritional requirements.
A fertilizer formulated for citrus trees is an easy option.
Pay attention to leaf color and overall growth.
An orange tree with persistent yellow leaves may have a nutrient deficiency, root problem, watering problem, soil pH issue, or another stressor.
Don’t immediately assume every yellow leaf means the tree needs more nitrogen.
Best Fertilizer for Lime Trees
Lime trees also appreciate consistent feeding while actively growing.
Container-grown lime trees can be particularly demanding because their roots have access only to the nutrients contained within the pot.
Use a fertilizer suitable for container citrus and follow the label’s application rate carefully.
Fertilizing Citrus Trees in Containers
Container citrus trees deserve special attention.
Unlike a citrus tree growing in the ground, the roots can’t expand into surrounding soil looking for nutrients.
Everything the tree receives comes from the container.
Additionally, repeated watering can leach nutrients from potting mix.
For this reason, potted citrus may need regular feeding throughout active growth.
You can use:
- Granular citrus fertilizer
- Slow-release fertilizer
- Water-soluble citrus fertilizer
Choose a fertilizer labeled as appropriate for container-grown citrus and follow its directions.
Never assume a potted tree needs the same quantity of fertilizer as a tree growing in the ground.
Overfertilizing a container can lead to fertilizer-salt buildup and root damage.
Signs Your Citrus Tree May Need Nutrients
One of the first signs gardeners notice is yellow foliage.
But diagnosing citrus problems based only on the word “yellow” can be misleading.
Look closely at the pattern.
Ask:
- Are older leaves yellow?
- Are new leaves yellow?
- Are the veins green while tissue between them is yellow?
- Is the entire leaf pale?
- Are only a few leaves affected?
- Is the tree producing healthy new growth?
- Is the soil constantly wet?
These clues can help distinguish nutritional problems from watering, root, or environmental problems.
Yellow Citrus Leaves
Yellow leaves are among the most common concerns citrus growers encounter.
Possible causes include:
- Nitrogen deficiency
- Iron deficiency
- Magnesium deficiency
- Zinc deficiency
- Manganese deficiency
- Overwatering
- Poor drainage
- Root damage
- Cold weather
- High soil pH
- Natural shedding of older leaves
Don’t immediately pour fertilizer onto a stressed tree.
First investigate the cause.
Nitrogen Deficiency in Citrus Trees
Nitrogen deficiency often produces generally pale foliage.
Older leaves may lose their rich green color first because nitrogen is mobile within plants.
A tree may also show reduced vigor.
If nitrogen deficiency is confirmed or strongly suspected, an appropriate citrus fertilizer can help.
Again, follow the product label rather than attempting to correct the problem with an extremely heavy application.
Iron Deficiency in Citrus
Iron deficiency often appears on newer growth.
Leaves may become yellow while the veins remain noticeably greener.
This is called interveinal chlorosis.
Importantly, iron deficiency doesn’t always mean the soil contains no iron.
High soil pH can reduce iron availability.
Adding more general-purpose fertilizer may therefore fail to solve the underlying problem.
Magnesium Deficiency in Citrus
Magnesium is another nutrient associated with chlorophyll and healthy foliage.
Deficiency produces characteristic yellowing patterns, often appearing on older leaves.
Before adding magnesium, however, try to determine whether there is actually a deficiency.
This brings us to one of the most popular homemade garden treatments.
Is Epsom Salt Good for Citrus Trees?
Epsom salt is magnesium sulfate.
That means it supplies:
- Magnesium
- Sulfur
If a citrus tree genuinely needs magnesium, Epsom salt can provide it.
But Epsom salt is not a complete citrus fertilizer.
It does not replace nitrogen, phosphorus, potassium, or the complete micronutrient package a tree may require.
Adding Epsom salt to soil that already contains sufficient magnesium isn’t automatically beneficial.
This is one reason soil testing can save both money and frustration.
Are Coffee Grounds Good for Citrus Trees?
Coffee grounds are another popular homemade garden amendment.
Used coffee grounds can be incorporated into a composting system where they contribute organic material.
However, dumping large quantities of coffee grounds around citrus trees shouldn’t be considered a replacement for a balanced fertilizer program.
A better approach is adding reasonable amounts of used coffee grounds to your compost.
Once the compost has broken down, apply the finished compost around garden plants as appropriate.
Are Eggshells Good for Citrus Trees?
Eggshells contain a large amount of calcium carbonate.
They can be added to compost, but they decompose slowly unless crushed very finely.
Like coffee grounds, eggshells aren’t a complete citrus fertilizer.
They shouldn’t be relied upon to provide all the nutrition necessary for healthy citrus growth and fruit production.
Are Banana Peels Good for Citrus Trees?
You’ve probably seen gardening tips recommending banana peels because they contain potassium.
While banana peels contain plant nutrients, burying a peel beside your citrus tree doesn’t create a balanced fertilizer.
I prefer putting kitchen scraps such as banana peels into compost.
Composting allows organic materials to break down before they’re incorporated into the garden.
Homemade Citrus Tree Fertilizer
Many gardeners search for a homemade citrus fertilizer because they want to reduce costs and reuse materials from around the homestead.
The important thing to remember is that homemade amendments aren’t automatically nutritionally balanced.
Citrus trees need specific amounts of multiple nutrients.
A safer homemade approach is improving the soil with properly finished compost while using soil testing and an appropriate fertilizer when additional nutrients are required.
Simple Homemade Citrus Soil Booster
You can use:
- Finished compost
- Well-aged composted organic matter
Spread a modest layer around the root zone without piling it against the trunk.
Think of compost primarily as a soil amendment rather than a precise replacement for citrus fertilizer.
Compost can contribute nutrients while also improving soil structure and biological activity.
Homemade Citrus Compost Mix
Instead of throwing useful kitchen and yard materials away, add suitable materials to your compost pile.
Possible compost ingredients include:
Greens
- Vegetable scraps
- Fruit scraps
- Used coffee grounds
- Fresh grass clippings in appropriate amounts
Browns
- Dry leaves
- Shredded cardboard
- Straw
- Small amounts of untreated woody material
Once completely composted, the finished material can be incorporated into your overall citrus-care program.
Organic Citrus Tree Fertilizer
If you prefer organic gardening, commercially produced organic citrus fertilizers are available.
They may contain ingredients such as:
- Composted plant materials
- Feather meal
- Bone meal
- Fish-derived ingredients
- Kelp
- Other naturally derived nutrient sources
Look for a product specifically designed for citrus or fruit trees.
Organic doesn’t mean you can apply unlimited amounts.
Always follow label rates.
Compost vs. Citrus Fertilizer
These two products serve overlapping but different purposes.
Compost
Primarily improves soil by adding organic matter while contributing some nutrients.
Fertilizer
Provides nutrients in known concentrations.
For many gardens, the two can complement each other.
You don’t necessarily have to choose one or the other.
Can You Use Manure Around Citrus Trees?
Properly composted manure can contribute nutrients and organic matter.
Fresh manure is another story.
Fresh manure can contain high concentrations of salts or nutrients and shouldn’t simply be piled around a citrus trunk.
If using manure-based compost, make sure it has been properly composted and apply it appropriately.
Mulching Citrus Trees
Mulch isn’t technically fertilizer, but it can play an important role in maintaining healthy citrus trees.
Organic mulch can:
- Reduce evaporation
- Moderate soil temperatures
- Suppress weeds
- Add organic matter as it decomposes
Possible mulch materials include:
- Wood chips
- Shredded leaves
- Pine bark
- Other suitable organic mulch
Keep mulch several inches away from the trunk rather than building a mound against the bark.
The infamous “mulch volcano” isn’t good for citrus trees—or most other trees.
Watering After Fertilizing Citrus Trees
Water and fertilizer work together.
Granular fertilizers generally need moisture to begin moving nutrients into the soil.
Follow your fertilizer’s directions.
At the same time, avoid keeping citrus roots constantly waterlogged.
Citrus trees need drainage.
A tree growing in saturated soil can develop root problems that cause symptoms that look surprisingly similar to nutrient deficiencies.
Don’t Fertilize a Severely Drought-Stressed Citrus Tree Heavily
If your citrus tree is severely drought stressed, dumping a heavy dose of fertilizer around it isn’t the first solution.
Correct the watering problem appropriately and evaluate the tree.
Healthy roots are necessary for nutrient uptake.
Fertilizer can’t compensate for dead or severely damaged roots.
Overfertilizing Citrus Trees
More isn’t better.
Too much fertilizer can result in:
- Root injury
- Salt accumulation
- Excessive vegetative growth
- Environmental nutrient loss
- Plant stress
Always measure fertilizer instead of estimating by handfuls.
If the label recommends a specific amount based on tree age or size, follow it.
Should You Fertilize Citrus Trees During Winter?
In climates where citrus trees slow down during winter and freezes are possible, heavy winter fertilization is generally unnecessary and may encourage poorly timed growth.
This is particularly important for gardeners in colder portions of Texas.
Tender new growth is more vulnerable to freezing temperatures.
Resume your normal feeding program when the tree enters active growth.
Container trees overwintered indoors should be managed according to their actual growth, light levels, and the fertilizer product being used.
Fertilizing Citrus Trees Before a Freeze
Avoid trying to “strengthen” a citrus tree against an approaching freeze by applying fertilizer.
Fertilizer isn’t freeze protection.
Instead, focus on actual cold-protection methods.
Depending on tree size and conditions, that might include:
- Moving containers into protected locations
- Covering vulnerable trees appropriately
- Protecting the graft union
- Maintaining proper soil moisture
- Using appropriate frost-protection techniques
Citrus Tree Fertilizer for Raised Beds
Citrus trees can be grown in large raised planting areas if they have sufficient root space and excellent drainage.
However, raised beds may dry more quickly than surrounding ground.
Monitor both:
- Moisture
- Fertility
Don’t automatically fertilize more simply because the tree is in a raised bed.
Let the tree, soil test, and fertilizer instructions guide you.
Citrus Tree Fertilizer for Indoor Trees
Indoor citrus presents another challenge: light.
A citrus tree growing beside a window may receive dramatically less light than one growing outdoors.
Reduced light can reduce growth and water use.
Applying large amounts of fertilizer won’t compensate for insufficient light.
For indoor citrus, concentrate on:
- Strong light
- Proper drainage
- Correct watering
- Appropriate container size
- Moderate feeding during active growth
Fertilizing a Meyer Lemon Tree
Meyer lemons are one of my favorite citrus choices for home gardeners because they adapt particularly well to container culture.
They’re also easier to move into protection when freezing weather threatens.
Feed actively growing Meyer lemons with an appropriate citrus fertilizer according to label instructions.
Container-grown trees may benefit from divided applications because regular watering can remove nutrients from the potting mix.
Watch leaf color and new growth rather than blindly increasing fertilizer.
Newly Transplanted Citrus Trees
Be conservative with fertilizer immediately after transplanting.
A newly planted tree needs to establish roots.
Follow recommendations for the particular fertilizer and tree you’re planting rather than placing concentrated fertilizer into the planting hole.
Concentrated fertilizer against young roots can cause injury.
Where Should Citrus Fertilizer Be Applied?
One of the most common mistakes is placing fertilizer in a pile beside the trunk.
Roots responsible for nutrient absorption extend outward.
Apply fertilizer evenly over the recommended root-zone area.
As the tree grows, the fertilized area should expand.
Always keep concentrated fertilizer from contacting the trunk.
Should You Fertilize All Citrus Trees the Same?
Not necessarily.
Consider:
- Tree age
- Tree size
- Citrus variety
- Container versus ground
- Soil fertility
- Soil pH
- Irrigation
- Climate
- Current growth
- Fertilizer formulation
That’s why a one-size-fits-all measurement such as “give every citrus tree two cups” isn’t good advice.
The correct quantity depends on the fertilizer concentration and the tree.
Soil Testing Before Fertilizing Citrus Trees
If you really want to know what your soil needs, have it tested.
This is particularly worthwhile for established citrus trees showing unexplained symptoms.
A soil test can prevent you from spending money adding nutrients your soil already contains.
For Texas gardeners, soil testing through an established agricultural testing service can provide valuable information about fertility and pH.
Citrus Tree Fertilizer Mistakes to Avoid
Even experienced gardeners sometimes make fertilizer mistakes.
Avoid these common problems:
- Using too much fertilizer. More fertilizer doesn’t guarantee more fruit.
- Applying fertilizer against the trunk. Spread it appropriately over the root zone.
- Fertilizing without considering watering. Damaged roots can’t effectively use nutrients.
- Assuming every yellow leaf means nitrogen deficiency. Yellowing has many possible causes.
- Treating Epsom salt as a complete fertilizer. It isn’t.
- Using kitchen scraps as a substitute for balanced nutrition. Compost them instead.
- Encouraging tender growth immediately before cold weather.
- Ignoring fertilizer label instructions.
- Never testing the soil.
- Fertilizing a severely stressed tree instead of correcting the underlying problem.
Simple Citrus Tree Fertilizer Routine
If all of this seems complicated, your citrus-care routine can actually be very simple.
Step 1: Check your soil.
Know the drainage and, ideally, soil pH and nutrient status.
Step 2: Choose a quality citrus fertilizer.
Look for nitrogen plus useful micronutrients.
Step 3: Feed during active growth.
Divide the appropriate yearly amount into applications according to the fertilizer directions and local growing conditions.
Step 4: Water correctly.
Don’t let the tree remain permanently soggy.
Step 5: Watch the leaves.
Leaf color and growth can provide early clues when something isn’t right.
Step 6: Adjust based on evidence.
Don’t automatically reach for another handful of fertilizer.
FAQ About Citrus Tree Fertilizer
What is the best fertilizer for citrus trees?
A fertilizer specifically formulated for citrus trees is usually an easy choice because it supplies nitrogen and other nutrients citrus needs. Look for products that also provide appropriate micronutrients.
How often should I fertilize citrus trees?
Citrus trees are commonly fed multiple times during their active growing season rather than receiving the entire amount at once. Follow your fertilizer label because application frequency varies significantly between products.
When should I fertilize citrus trees in Texas?
Spring through summer is generally the primary feeding period. In portions of Texas prone to freezes, avoid unnecessarily encouraging tender new growth late in the growing season.
Is Epsom salt good for lemon trees?
Epsom salt provides magnesium and sulfur. It can supply magnesium when magnesium is actually needed, but it isn’t a complete lemon-tree fertilizer.
Are coffee grounds good for citrus trees?
Used coffee grounds can be composted and incorporated into finished compost. They shouldn’t be considered a complete fertilizer for citrus trees.
Are eggshells good for lemon trees?
Eggshells contain calcium compounds and can be composted, but they aren’t a balanced lemon-tree fertilizer.
Can I use Miracle-Gro on citrus trees?
Use fertilizers only when their labels indicate they’re appropriate for your plant and growing situation. Follow the manufacturer’s application directions rather than assuming all general-purpose fertilizers should be applied identically.
Why are my citrus tree leaves turning yellow?
Possible causes include nutrient deficiencies, excessive moisture, poor drainage, root damage, environmental stress, high soil pH, and normal aging of older leaves. The pattern of yellowing can help identify the cause.
Can citrus trees be overfertilized?
Yes. Excessive fertilizer can injure roots and contribute to salt accumulation and excessive vegetative growth.
Should I fertilize citrus trees while they’re flowering?
A citrus tree’s fertilizer program should be based on its overall growing-season requirements rather than attempting to force flowering with a sudden heavy fertilizer application.
Growing fruit, herbs, and vegetables at home is one of the most rewarding parts of homesteading. After learning how to properly fertilize your citrus trees, check out our guides to fig tree varieties, growing a healthy basil plant, and caring for an oregano plant to keep expanding your productive backyard garden.
Final Thoughts on Citrus Tree Fertilizer
Finding the best citrus tree fertilizer doesn’t require turning citrus growing into a chemistry experiment.
Start with the basics.
Give your tree plenty of sunlight, well-drained soil, appropriate water, and a fertilizer designed to provide the nutrients citrus trees need.
Then pay attention to the tree.
Deep green foliage and healthy new growth are good signs. Yellow leaves, weak growth, or unusual leaf patterns tell you it’s time to investigate rather than automatically adding more fertilizer.
For Texas gardeners, timing is especially important. Feed citrus while it’s actively growing, but remember that encouraging tender new growth late in the season can become a problem when an unexpected Texas freeze arrives.
And while homemade garden ingredients such as coffee grounds, eggshells, banana peels, and Epsom salt certainly have their uses, none should automatically be treated as a complete citrus fertilizer.
Compost your kitchen scraps, improve your soil, test it when necessary, and give your citrus trees the nutrients they actually need.
With a sensible citris tree fertilizer schedule and a little observation, your lemon, lime, orange, grapefruit, and other citrus trees can reward you with healthy foliage, fragrant blossoms, and homegrown fruit for years to come.
