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Stark® Blueberry Special Fertilizer

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  • 1 - 2: $19.99 Each
  • 3 or more: $12.99 Each
Item #H16987, 4 Pounds.
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Specially formulated for blueberries! Use this balanced 12-12-12 fertilizer to add nutrients that blueberry plants need in the soil for improved growth and production. Apply as directed. Repeat at 6-week intervals as needed during the growing season. Test soil prior to use and avoid over-feeding. Do not fertilize after July 1.

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Questions & Answers

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Browse 37 questions Browse 37 questions and 98 answers
Why did you choose this?
Stark Bro's Store
I ordered new blueberry plants from you and I want them to have the best chance at a good start.
Christine C on Feb 16, 2021
i purchased some plants from you two years ago I believe they need a boost to be more productive this year.
BENJAMIN L on Jan 22, 2021
I ordered new blueberry plants from you and I want them to have the best chance at a good start.
Christine C on Feb 16, 2021
Hoping to increase my harvest
Pamela P on Feb 16, 2021
i purchased some plants from you two years ago I believe they need a boost to be more productive this year.
BENJAMIN L on Jan 22, 2021
To help the blueberry plants that I ordered to grow.
Jackie on Dec 6, 2020
because my four year old plant still gives only minimal and also small fruit. Seems to be what mine needs.
Michael S on Oct 8, 2020
Needed for Blueberries
Charles O on Sep 29, 2020
Because I want tasty and nutritious blueberries. Blueberries are one of nature's healthiest plants.
Corley M on Sep 23, 2020
Need it
Deborah B on Sep 13, 2020
2nd year growing blueberry plants in soil that needs fertilizer
Marsha W on Sep 9, 2020
New to me
Nancy H on Sep 5, 2020
Needed for existing plants

It is really difficult for me to buy your product. I love your trees and plants and I understand they are not always available. I don???t understand not getting a notification when they become available.
Not once !
John M on Aug 15, 2020
I will need it for my plants
Domingo S on Jul 25, 2020
We love blueberries and I hope this product will help achieve that.
Tericia A on Jul 15, 2020
I used in past
Beth C on Jul 13, 2020
Trying to get blueberry bushes started in my yard
Steven H on Jun 23, 2020
Enrique L on Jun 19, 2020
To feed my new blueberries.
Farnklin Y on May 22, 2020
To have the correct nutrients for a good yield.
Cheryl P on Apr 27, 2020
PAUL B on Apr 18, 2020
Recommended. Reviews
David H on Apr 14, 2020
Richard P on Apr 14, 2020
wanted blueberries to get a good start
Sandra M on Mar 29, 2020
I'm don't know what the hell I'm doing and this was recommended.
Meagan N on Mar 27, 2020
Stark Brothers is my most reliable plant provider. I trust them implicitly and have done business with them for over 40 years. All of their products are top drawer
ROBERT M on Mar 27, 2020
EDWARD T on Mar 23, 2020
want to give my trees a good start
Margaret B on Mar 21, 2020
Raising three different varieties of Blueberries and want to give this a try
STEVEN S on Mar 20, 2020
My blueberries never survive. I am willing to try anything at this point.
Jennifer R on Mar 18, 2020
Good reviews, soil is not great.
Samuel A on Mar 13, 2020
Just purchased two plants and want them to get started properly.
Mike on Mar 13, 2020
needed a fertilizer compound just for blueberries since standard fertilizer doesn't give me the outcome I want
stella s on Mar 11, 2020
Highly recommended by others
Karen W on Mar 1, 2020
Good reviews
Vic K on Feb 29, 2020
Ordered at the same time as plants - good idea to get them a healthy start.
Mary M on Feb 24, 2020
It was highly recommended in the reviews that I read.
Sandra K on Feb 23, 2020
It Rocks!
JOHN K on Feb 20, 2020
To improve the soil for my blueberry plants.
Leslie C on Feb 6, 2020
Normally I buy organic fertilizer for specific plant types from another company. But thought I'd try it to start off my blueberries.
Josie on Feb 1, 2020
To get my blueberries off to a good start.
glenna d on Jan 9, 2020
I'm a new gardener and figured I could use all the help I can get!
Amy R on Nov 16, 2019
Good price and free shipping
CHRIS Y on Jul 31, 2019
for more fruitful production
Susan S on Jul 24, 2019
It works!
JIM H on Jun 3, 2019
Excellent review
Karen K on May 30, 2019
I think I need it.
Carolyn O on May 30, 2019
It's been working great so far - why change?
Leah D on Apr 23, 2019
We used it before and had good results
DAVID W on Apr 19, 2019
It works for my blueberries...
Rocco M on Apr 7, 2019
I have a few potted blueberry bushes. The berries became smaller and smaller during the summer and some of the leaves turned yellow. I was e-mailed that the ingredients that make up this fertilizer are from natural materials but not considered certified organic, which is O.K. with me. If I get my side lot from the county, then I will be growing more blueberry bushes. My raspberry plants have been doing well over the past 37 years. It is an easier berry bush to grow.
Clara T on Apr 1, 2019
I want healthy plants.
Amy T on Mar 28, 2019
Hoping to increase my harvest
Pamela P on Feb 16, 2021
To help the blueberry plants that I ordered to grow.
Jackie on Dec 6, 2020
How many plants will the 4 lbs fertilize?
Carey S on Feb 24, 2016
BEST ANSWER: A good question, yet difficult to answer! This will help: There are approximately 7.5 cups, or approximately 120 Tablespoons, of this blueberry fertilizer per 4-lb package. According to the label: For new plants, use 1 Tablespoon of fertilizer per plant. For second-year plants, use 2 Tablespoons of fertilizer per plant. For fruit-bearing plants, use 1 cup of fertilizer per plant. Because this is a granular fertilizer and the amount used varies based on the age of the plant, it???s difficult to state exactly how many plants one package will cover. It could be a few mature plants, or many new plants, or somewhere in between.
What percentage or weight of sulphur is in this? If used in amounts recommended for proper fertilization, what are its pH adjustments? (Totally unscientific - I do not need the chemical explanation - just a general idea. Rather than using sulphur to manually adjust pH and then fertilizing, I would like to know how to handle an all-in-one product.)
Carol L on Mar 10, 2016
BEST ANSWER: The package (hard to see in the image, I know) says it's 11% sulfur. Once I got my soil pH where I needed it to be for blueberries (4.5-5.5) using soil acidifier and testing with a soil pH meter, it appeared that the sulfur in the fertilizer helped slow the rate at which my water and rain raised the pH again. Even when using the fertilizer, I still needed to test and amend with garden sulfur as needed (keeping in mind it takes time for the pH to adjust). If your location has more acidic soil, your soil tests may show that the sulfur in the fertilizer is enough to keep your pH where blueberry plants like it to be.
How do you apply this to the plant? Is it to be mixed with water or do you just spread the powder around the plant?
Quinn K on Mar 28, 2016
BEST ANSWER: I have blueberry bushes planted in a row and mulched. In late winter i rake away the mulch from the outer edges where roots are growing (not under bush), sprinkle the fertilizer, rake mulch back over. As spring rains saturate the ground, the fertilizer is leached down to roots over time.
Does this lower ph as well?
steve e on Feb 27, 2016
BEST ANSWER: YEs it has sulfur in it which helps lower pH.
My blueberries are not very sweet, how can I Sweet them. ?
big jim on Mar 28, 2017
BEST ANSWER: Make sure they are not shaded and get 8 hours or more of sunlight exposure and make sure your soil pH is in the 4.5 to 5 range. Also, a big reason they may be tart is that they haven't fully ripened. I have to put "netting" over my 8 plants to keep the birds from eating them as soon as the blue color appears. That allows them to fully ripen before they are picked.
Can this fertilizer be used on plants that are producing berries now? Also I found a bag I have had for maybe three years. It has never been opened. Is it still good or should I purchase a new bag?
Suzanne J on May 21, 2016
BEST ANSWER: The best time to use this fertilizer (according to the label) is when new growth emerges in the spring. It's not "too late" to use even if you have berries on your plants already, but I wouldn't recommend fertilizing any later than June. If there are no signs of elements breaking down the product within the bag, or causing it to clump, then it may still be viable to use.
Will this last more than 1 growing season? My wife and I have just 3 blue berry plants and worry that the fertilizer might not be effective next year.
Tim S on Jun 28, 2016
BEST ANSWER: This will last years if kept dry. It breaks down if the contents get wet.
how do you know which suckers to prune on my blueberry plants?
Donna D on Jul 1, 2018
BEST ANSWER: You should allow 4 or 5 of the new shoots from the bottom of the plant to grow each year and prune out some of the older wood. The best berries are produced on the 2 - 4 year old branches. Seven year or older branches should be removed to "renew" the plant. If you remove a few each year and allow a few of the new shoots to grow, you'll have a good crop each year.
Is this a soil acidifier to lower ph as well?
mike K on Feb 17, 2021
BEST ANSWER: We appreciate you reaching out to us. Our blueberry fertilizer will not lower your ph. You will still need to amend adding elemental sulfur, aluminum sulfate or sulfuric acid. The choice of which material to use depends on how fast you hope the pH will change. Used coffee grounds can also be used. Another method for lowering blueberry soil pH.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Can the Blueberry Special Fertilizer be used for anything else in the garden or can any fertilzer be used on blueberries?
Terry on Mar 6, 2016
BEST ANSWER: This fertilizer is specifically made for blueberries and other plants that require acidic soil. Most garden plants require a more alkaline based soil and fertilizer,
Best time to fertilize and then how often?
Jason S on Dec 24, 2019
BEST ANSWER: I fertilize in early spring before the leaves and buds break out. Works well for me and I feel the fertilizer is being used while the plant is actively growing. If you fertilize in the fall there is a good chance most of the nutrients will get washed down into the soil below the root level before they are ever used.
Why can???t I fertilize after July 1?
Autumn D on Aug 20, 2019
BEST ANSWER: We don't recommend fertilizing after July 1 because that will encourage late-season growth that is easily damaged by fall frosts, and can invite pests/diseases and lessen the vigor of the plant.
Do I fertilize for the winter, after the first hard frost?
jt on Nov 29, 2018
BEST ANSWER: Please do not fertilize blueberry bushes after July 1. It encourages new growth that will be damaged by cold weather.
Is this fertilizer organic?
Gardener on Feb 17, 2021
BEST ANSWER: We appreciate you reaching out to us. No this is not an organic fertilizer.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
What would be a pollinator partner for the pink lemonaide blueberry bush?
Phil H on Jan 22, 2021
BEST ANSWER: We appreciate you reaching out to us. Blueberries are self pollinating and do not require another variety to bear fruit. However planting a second variety of any kind will increase your crop yield.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
I have like a white look fungus on my plants &how can get rid of it?
Arthur N on May 22, 2020
BEST ANSWER: We appreciate you reaching out to us. It may be powdery mildew, I recommend using Serenade?? Garden Disease Control or Bonide?? Citrus, Fruit & Nut Orchard Spray.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
The Elliot Blueberries I purchased say to have a ph of 4 to 5. I measured the 3 I received and they are in the 6 to 7 ph range as received. Is this acceptable?
Big Guy on May 19, 2020
BEST ANSWER: We appreciate you reaching out to us. For the Plants to flourish and bear fruit the soil ph where they are going to be planted at need to be between a 4-5.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Is this fertilizer organic?
SusanK on Apr 23, 2020
BEST ANSWER: We appreciate you reaching out to us. Unfortunately this product is not organic.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Does this fertilizer make the soil more acidic?
Logan on May 19, 2019
BEST ANSWER: Yes, it does.
What products would you recommend for fertilizer and a soil acidifier for growing home organic blueberries and your organic cherry trees?
juliegrace on Mar 12, 2019
BEST ANSWER: Hi Jul. As a fertilizer, this is a good organic all-purpose food: // a soil acidifier for your blueberries: //'s really all you need The fertilizer will work for the cherries and blueberries, but just keep the soil pH for the cherries at 6.0 to 6.5 and the blueberries at 4.5 to 5.0 and they should do well.
It's is February 27th is it too late to put fertilizer down for the blueberry?
Rusty on Feb 23, 2019
BEST ANSWER: Please wait to fertilizer until the plant comes out of dormancy.
Im having yellow leaves with green veins. Its now fall what do i do?
Jessie C on Oct 3, 2018
BEST ANSWER: Hi, Jessie. It's like one of two things: the plant has gotten too much water, or the soil is not acidic enough. We recommend that you do a soil pH test. Blueberries like their pH between 4.5 and 5.0. If the number is too high, you can work in some soil acidifier in around the plant: /
How much fertilizer do you use each time?
Jeanne G on Sep 22, 2018
BEST ANSWER: Hi, Jeanne. That will depend upon how old the plant is. For 1st year plants, use 1 T in a circle 1' from the plant. For 2nd year plants, use 2 T. in a circle 1.5' from the plant. For bearing plants, use 1 cup. Don't fertilize now; you'll encourage new growth that will damaged by frost/winter. It's best to wait until the plants leaf out next spring.
I've read that leaves yellowing and turning red indicates a lack of magnesium and iron, can you confirm and does this fertilizer contain both magnesium and iron? These are freshly planted year old bushes.
Chuck R on Jun 23, 2018
BEST ANSWER: Hi, Chuck. That is correct, but it can also be an "overdose" of water, which can severely deprive the plant of iron, causing chlorosis. The blackberry fertilizer does indeed contain magnesium and iron, as well as calcium, boron, manganese, copper and zinc. It really does make a difference in the number and quality of your berries.
The instructions for bearing plants states "Apply one cup of Blueberry Special when new growth begins in spring." My question is whether this one cup is the only application for the entire year or if this is every six weeks?
James D on May 7, 2018
BEST ANSWER: That is the application for the whole year.
What are the numbers?
Grannyvee on Apr 14, 2018
BEST ANSWER: This is a 12-12-12 fertilizer with additional micronutrients and a soil acidifier, just for blueberries.
Is the Perpetua blueberry on sale the one that produces twice yearly?
Mary R on Feb 23, 2018
BEST ANSWER: Yes, it yields both a summer and fall crop.
We ordered & received 2 blueberry bushes from you. At the time, we thought our soil content would support them, but as the season has progressed, our bushes are not doing well. If we were to apply this fertilizer now, would it help them to revive and survive the winter months that are quickly approaching?
Faye M on Aug 31, 2017
BEST ANSWER: We're glad you asked, because that would not be a good idea. Fertilizing now would encourage tender new growth that would be damaged by cold weather. Wait until early spring, and then follow the directions. What you can do now is a soil test to see if the pH is between 4.5 and 5.0. If it's higher than that, the soil needs some acidifier. That would also explain the slow growth rate of your bushes.
Is this fertilizer organic and if not, what product or combination of products and amounts per application is equivalent to 12-12-12?
Kathy on May 5, 2017
BEST ANSWER: This product is not certified organic. From the label: Total Nitrogen (N)???12.00% (more specifically, 12.00% Ammoniacal Nitrogen or NH4). Available Phosphate (P2O5)???12.00%. Soluble Potash (K2O)???12.00%. The label also notes the other trace elements specific for blueberries: Sulfur (S)???11.00%. Magnesium (Mg)???3.00%. Source of Nutrients: Ammonium Sulfate, Ammoniated Phosphate, Muriate of Potash, Sulfur, and Magnesium Oxide.
I have 60 plants, how much fertilizer should I purchase. young plants?
Mike H on Apr 12, 2017
BEST ANSWER: First-year plants need 1 T. each at 6-week intervals until midsummer. There are 16 tablespoons in a cup; one cup equals .5 pounds, so there are 8 cups of fertilizer in each bag. For 60 plants, that means 3.75 cups of fertilizer per treatment; if you start fertilizing April 15 or so, when the first leaves have reached full size, and then again at the end of may and the middle of July, that would be three applications x 3.75 cups of fertilizer, for a total of 11 cups of fertilizer per year for all of your 60 plants. These are 4 lb. bags, so you will need 3 bags. Next year you will need double that amount.

Customer Reviews

4.8 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
I can't believe nobody has written a review for this blueberry fertilizer yet... I have been trying to get my blueberries to grow for several years and have not had any luck, it has been a struggle to keep them going. I used this in the fall of 2014 and in the spring of 2015. I had blueberries on almost every plant and the growth was unbelievable.. I live in Nebraska so blueberries don't grow very well here. I am definitely going to order more for this year.
February 20, 2016
Good fertilizer.
Would recommend for new and young plants. Older ones it might get a little expensive. You use a few tablespoons per young plant and a cup per older plant.

Has good sources of nutrients including ammonium sulfate which provides N in a form nh4+, which doesn't leach from the soil due to its positive charge. The soil has a negative charge called CEC (cation exchange capacity) and it holds the + charged ions in suspension better than - charged ions. Because + and - attract, while - and - ions repel.

There is two forms of sulfur in this mix. One from the ammonium sulfate and the other from added elemental sulfur. Sulfur is important for blueberries because they need low pH. The sulfur breaks down slowly in the soil (3-6 months) and forms sulfuric acid which In turn breaks apart to release h+ hydrogen ions that lower pH.
February 28, 2016
over 6 years ago
I planted blueberry bushes last spring, and made sure to use the Stark Blueberry Special Fertilizer as instructed throughout the summer and into the fall. The bushes were all accelerated in the spring this year with tons of new growth and buds galore.
June 5, 2016
over 5 years ago
Good stuff.
This is excellent fertilizer. Provides all necessary necessary nutrients for good plant growth plus sulfur the help keep the soil p.h. in the acid range.
May 10, 2016
over 6 years ago
great product
works well and blueberry yield was increased. overall plant health was increased
May 8, 2016
over 6 years ago
I would recommend this fertilizer if your looking for new growth or larger berries. I live in the southeast coast of NC and did a first spreading in the middle of March. I did a second spreading the beginning of May and will wait until July for the last spreading as I already have Huge ripe berries. I will write another review in the fall to let you know the finale results.
May 30, 2018
over 2 years ago
My bushes love it!
I wouldn't use anything else. This 12-12-12 formula makes my bushes happy. They started with it and I'm not changing. Thanks for making a reliable product.
May 10, 2019
1 year ago
Doing well
My blueberry bushes are growing and doing well. Thank you.
May 23, 2016
over 4 years ago
Great Stuff
My blueberry bushes are growing and are very healthy because of this fertilizer.
May 6, 2017
over 3 years ago
Good looking fertilizer. Did not help the little blueberry plants I got last year when I purchased it but did good on my blackberries.
May 17, 2018
over 4 years ago