7 Best Fertilizer for Magnolias – 2021 (Reviews)

Magnolia, a disease-resistant, rich in nutrients, an ancient plant, belongs to the family of Magnoliaceae.

The species of magnolia vary in colour, size and shape. Magnolia blooms in April and keeps on blooming till June.

Seeds that are planted in the late winters and early spring nourishes well.

Magnolia grows well in moist and slightly acidic soil.

They have big waxy leaves and their summer blooms are also thick and creamy. Some species bloom in late winters while others bloom in summer.

It is recommended to look for places that are less exposed as strong winds can damage flowers and branches.

They are less tolerant of salt spray and winter cold. Because of their enchanting beauty and pleasing fragrance they are now being naturalized around the globe.

Fertilizing Magnolia

Carefully planted magnolia can be stimulated with light fertilizers.

Fertilization is generally done after two or three weeks when the soil drops below 40 degree fahrenheit. 

A slow release fertilizer works well for nourishing magnolia as it supplies all necessary nutrients throughout the growing season.

 If your tree looks healthy and is blooming well please avoid fertilizing it. Baby magnolia should also not be fertilized.

What a buyer should look in a fertilizer

Nitrogen is considered as the best and forgiving fertilizer for tree growth.

A fertilizer containing three parts of nitrogen and one part of phosphorus or a fertilizer containing only slow release nitrogen will do the job for you.

2-4-8(12% nitrogen, 4%phosphorus, 8 percent potassium)or 20-5-10(20%nitrogen, 5%phosphorus, 10%potassium) is ideal for magnolia trees. 

General guideline for magnolia fertilization

It is generally said that a fully grown magnolia tree needs  1/10 pound of slow release nitrogen for every inch of trunk diameter. 

Deep feeding magnolia

Fertilization of little magnolia plants is very simple as the roots of magnolia are very close to the surface so even distribution of fertilizer is all you need to do to deep your little magnolia .

Mature magnolia tree roots go up to four times the diameter of branches. To feed these roots well you’ll have to dig small holes(4 to 6 inches deep) around the tree in an even pattern.

The numbers of total holes can go up to 5 holes per inch of trunk diameter. Then fertilize the holes evenly.

Things to keep in mind while fertilizing Magnolia 

  • Avoid over fertilization as it can damage your tree. 
  • Magnolia trees should only be fertilized if the growth is weak
  • Magnolia tree sheds its leaves every day so it’s healthy and it should not be taken as a sign that magnolia needs fertilization. 


Here is the list of Best Fertilizer available for Magnolia in Market.

1. TreeHelp Annual Care kit For Magnolia (Slow-release fertilizer for magnolia) 

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The TreeHelp all in one complete care kit is specially designed to give you a complete and excellent solution.

The four components, biostimulant, mycorrhizal treatment, premium fertilizer and biostimulant, are kept together to bring your plant to life.

It is proportioned to treat two or three baby plants or one fully grown magnolia tree.

This complete solution can be used anytime during the year however it is recommended by the makers to avoid using it in winters and late fall.

Mycorrhizal treatment is specifically designed for roots as it is said that only a healthy foundation can make a building stand tall and strong.

Mycorrhizal fungi go into roots and create excellent conditons for roots to grow.

The high amount of potassium, phosphorus and slow-release nitrogen helps in producing larger and bountiful flowers.

The water-soluble biostimulant gives your plant an overall health boost. Its can be used for other trees and shrubs too.

This highly recommended blend of micro and macronutrients comes with a complete and detailed instruction and the TreeHelp replies to your queries in 24 hours. 

  • Promote root development and disease resistantnEasy application according to recommendations
  • Excess use can burn plantsnApply recommended amount

2. Osmocote Fertilizer 19-6-12, Slow Release

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The two main slow release nitrogen and phosphorus parts of this 19-6-12 osmocote fertilizer puts it on my list of best fertilizers for magnolia trees.

This safe to use fertilizer releases all essential nutrients in the right time so the magnolia plant can grow stronger.

It is a slow-release fertilizer but its release time depends heavily on media temperature.

At 60 degrees its release time is four to five months at 70 degrees its time is three to four months at 80 degrees its release time is two to three months and at 90 degrees its release time is one to two months.

One good reason to go for this fertilizer is it is readily available in the market. It increases shoots and promotes root development.

Application rate:

For ground plants

 2 to 9 pounds per cubic yard is sufficient. 

For containers pots

1 gallon of container(3-14 grams) 

2 gallon of containers(6-29 grams) 

3 gallon containers( 11-18 grams) 

5 gallon containers(18-82 grams)

7 gallon containers(26-117 grams) 

Top dressing

1-2Ibs per one hundred sq. Ft

The company suggests following instructions as the improper application is harmful to the environment.

  • Nutrients are encapsulated within multiple layers of polymeric resin.nEasy Application method
  • Available in large quantitynBit higher to afford

3. The Anderson PGF Complete fertilizer

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Why is this general plant and grass fertilizer on my recommended fertilizers list for magnolia tree?? Well because of its handy design.

 All the necessary ingredients come enclosed in one bag.

This easy to go with fertilizer can fill up the needs of the magnolia tree. Slow-release nitrogen keeps feeding the roots up to 8 weeks.

Humic and fulvic acid create a better environment for roots to grow. This product is a result of a year’s hard work.

It is tried and tested on plants by doctors before it is made available for sale in the market.

This cheap general fertilizer is not designed for magnolia trees actually it is designed and manufactured to improve soil conditions and overall health of various plants.

The company claims that is it promotes flowering and build stronger roots. Having all the needed nutrients in one bag makes it easier to store and apply. Its weight is 40.2 pounds.

Excessive use should be avoided as it can damage your soil and plant but it can also not be considered as a drawback because excessive use of anything is bad. 

4. Southern Ag Chelated Liquid Iron, 16 OZ

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As its name suggests, it is formulated to fulfil iron deficiency in magnolia and other plants.

 It prevents yellow leaves and premature leaf drop.

It ensures balanced iron supply to all needed parts of the plant.

Correct use may bring resistance against disease and droughts in your magnolia and other trees.

It promotes a rich deep green colour.It aids in increasing stalk strength and promotes rapid growth.

Following proper instruction may bring dramatic change within a week. 

  • Application: Mix with water and use it as drenching spray. 
  • Comes with detailed instructions. 
  • Size:16OZ
  • Rated as best Iron Fertilizer and Amazon’s choicenQuick action and multi purpose
  • Available in liquid form so handle with care

5. Natural Liquid Fertilizer 16-4-8 NPK Gallon

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Easier application and being organic in nature puts it in the list of one of the best natural fertilizers available in the market.

 It comes in liquid form and folia is used for its application. Studies have shown that liquid fertilizers give instant results.

One good component which is not found in any of the above mentioned fertilizers is its salt index feature.

This advanced feature ensures less tissue burning as your plants will be less exposed.

It contains B-1, Gibberellins, Auxins, Iron, Zinc, Copper, Cobalt, Manganese, Molybdenum, Sulfur and B-12. Besides magnolia, it works well for house plants, vegetables, shrubs, trees and lawns.

The company claims that it is pet friendly. Excessive use should be avoided as it may result in tissue burning. 

For best results water your plants after 6 to 8 hours

Item weight:10 pounds per pack

  • Promotes root growthnEnvironment and Pets friendlynQuick action
  • Overuse can cause burning

6. Fertilome Tree And Shrub Food(best fertilizer for magnolia grandiflora)

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This tree and shrub food are recommended by most gardeners. It was made available in the market after being tested practically.

 It is excellent for increased disease resistance, chlorophyll formation in trees and shrubs.

This fertilizer aids in moving balanced food to the feeder roots. Its scientific formulation eliminates the need for digging holes.

Equally beneficial for nut trees, shade trees, citrus, tropical, evergreen and flowering trees. Its works well as most reviews suggest but it is a little pricey. 


For shrubs

¬Ĺ cup per sq. Yard of soil area. 

For trees

20Ibs can feed up to ten 4″ diameter trees. 

Chart available for detailed information. 

7. Scotts evergreen, flowering tree and shrubs( Best for magnolia  hydrangea and evergreens) 

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Scotts fertilizer is in Amazon choice for magnolia, hydrangeas, evergreens, dogwood and other acid friendly trees and shrubs.

It is a hundred per cent safe and can be applied directly to the soil. This fertilizer works equally well on container pots, planters, bed areas and plants in pots.

 It is not only highly recommended for all types of flowers but it is also safe for vegetables like tomatoes and peppers.

Careful application improves soil condition and promotes root growth. 

Application rate

1 cup is sufficient to cover 35 square feet. Apply evenly on soil. Water your plant thoroughly as it is water-soluble. Apply every 2 months during peak season.

For best results and beautiful flower blooms, keep feeding your plants every one or two weeks. 

Item weight: 3 pounds per packet.

8. Jobe’s organic tree, shrub and evergreen fertilizer spikes with biozone

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This environment-friendly fertilizer is also on my list because of its excellent blend of nutrients and microorganisms i.e mycorrhizal fungi, archaea and healthy bacteria.

As per recent research, these microorganisms clean the soil thoroughly and aid in bringing the soil back to healthier state This excellent combination promotes root growth, nutrient absorption and generates resistance in plants against diseases.

Because of its organic it is one hundred and ten percent safe around kids and pets. This in-ground feeding system brings long term benefit to tree/ plant and specifically magnolia trees.


Take your first step towards fertilizing by watering the plant thoroughly. Drive the spikes into the soil, distancing it 30 inches from the trunk, using a hammer and plastic driving cap. Distribute the spikes evenly around the roots. Your job is done. 

Available sizes

8 spikes per pack and 6 spikes per pack.

fertilizer for magnolias

Common types of magnolia

There are more than 80 types of magnolia trees in world but some common types of magnolia trees are listed below 

1.Southern Magnolia (Magnolia grandiflora) 

2.Saucer Magnolia (Magnolia x soulangiana) 

3.Star Magnolia (Magnolia stellata) 

4.Loebner Magnolia (Magnolia x loebneri) 

5.Sweetbay Magnolia (Magnolia virginiana) 

6.Cucumber Tree (Magnolia acuminata) 

7.Bigleaf Magnolia (Magnolia macrophylla) 

8.Kobus Magnolia (Magnolia kobus) 

9.Lily Magnolia ( Magnolia liliflora) 

10.Umberlla Magnolia (M. tripetala) 

Why should you have magnolia tree in your garden

  • Because most fully grown magnolia requires less care they can tolerate hot summers and moderate droughts. 
  • They are naturally resistant to pests. 
  • If a magnolia tree is given right growing conditions it can live upto 100 years. 
  • They give a very eye-catching sight in spring. 
  • Because magnolias are versatile and disease resistant. 
  • They are easier to care for. 
  • They are not fragile and they have large blooms. 
  • Because they are loved by migrating birds. 

Health benefits relating to magnolia 

Magnolia trees are favorite because of some medical reasons like magnolia barks and flower buds are used to make medicines.

Magnolia is also used to treat depression, anxiety, stress, inflammation, headaches, fever, constipation.It can help you in losing weight. Its flower buds can be used to treat issues like runny nose, cold, sinus pain and stuffy nose. It eases tooth pain.

When should you plant magnolia 

According to the united states national arboretum:

Evergreen magnolia 

Early spring

Deciduous magnolia

If you live in North  – Spring

If you live in south  -Fall


Are coffee grounds good for Magnolia trees?

It is best for acid-loving plants. If your soil is alkaline. You can apply coffee grounds but prevent fresh coffee grounds.

What i should feed my Magnolia Tree?

Magnolia tree should be feed with an optimum level of fertilizer. The best fertilizer should contain all ingredients like Nitrogen, Phosphorus and potassium with minerals.

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1 Comment
  1. Great article but I have a question. I have two large, 60 plus year old magnolias and we had subzero temps for about 4 days straight. It’s blooming well right now but they look pathetic. The leaves don’t have a healthy green color. It’s June 5, NW Arkansas. Is it too late to fertilize now?

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