Contact Us800.325.4180Live Chat $9.99 Flat-Rate Shipping plus Free Shipping on all orders $99+ Quick Order

Stark® Blueberry Special Fertilizer

Order more & SAVE!
  • 3 or more: $12.99 each
Item #H16987, 4 Pounds
FREE Shipping
on orders of $99+*


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.

Shipping Information

Estimated Delivery Date

Our Promise of Satisfaction

1 Year Warranty

Every order comes with our promise of satisfaction. If you aren't completely satisfied with your order, let us know within one year for a free one-time replacement or refund.


We've 'tagged' this item with specific keywords that help you find other products that share features or characteristics with this one. Select a tag below to view all the items that have that particular trait.

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 26 questions Browse 26 questions and 68 answers
Why did you choose this?
Stark Bro's Store
Good price and free shipping
CHRIS Y on Jul 31, 2019
It works!
JIM H on Jun 3, 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
Convenience. Buying a blueberry bush and needed fertilizer too.
Craig S on Mar 17, 2019
havent used it yet..heard it has great reviews
JOSEPH D on May 10, 2018
I have never grown blueberries before and this is the only place I have seen fertilizer specifically for blueberries.
Lisa J on May 10, 2018
reviews on your site were very positive for this special fertilizer
RICHARD M on May 6, 2018
Have a blueberry patch. Have used this in the past works well.
Frances G on Apr 29, 2018
Gives blueberries manic boost.
GERARD D on Sep 15, 2017
The right combination of elements for my plants
Donald S on Jun 12, 2017
raw dirt they will be planted in so need to help them along
Pamela Q on Feb 20, 2017
I used this for the first time last year. It really worked. I will be buying it every year now.
JAMES H on Jan 31, 2017
We have 44 high bush blueberry plants that have produced for years in an enclosed area.. The Stark blueberry special fertilizer helps produce large crops of blueberries in addition to our routine caring of the plants. We share the crop with family and friends and I freeze the remainder of the crop to enjoy throughout the year.
MARSHA G on Sep 26, 2016
Convenient blend of soil amendments for my blueberries.
shirley t on Aug 23, 2016
recommended for my plants
Peter M on Jul 26, 2016
Blueberrys love it.
JAY G on Jun 16, 2016
Seems like the BBs love it!
Judge L. F. C on Jun 13, 2016
To feed the berries. So many berries this year.
Tonya J on May 17, 2016
Not very many fertilizers available that are geared specifically for blueberries.
mike s on Apr 26, 2016
I used this last year on my new blueberry bushes and intend to use this year. Good product.
Kimberly B on Apr 12, 2016
Want my blueberries to get a great start this year!!
Deborah S on Mar 18, 2016
To give my blueberry bushes a head start.
Ben C on Mar 13, 2016
Looking for a blueberry fertilizer from a reputable source
H S P on Mar 1, 2016
Ease of proper care for blueberries.
Barbara I on Feb 25, 2016
for more fruitful production
Susan S on Jul 24, 2019
Excellent review
Karen K on May 30, 2019
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.
Does this lower ph as well?
steve e on Feb 27, 2016
BEST ANSWER: YEs it has sulfur in it which helps lower pH.
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: IT is granules. You spread them out under plant around the drjpline. Just stay 6 in or so away the the base of the plant so you don't burn it. It would be good to mix it into the soil a little but you dont have to. I used this last year and my 1 st year blueberries went wild! They are 3 ft tall now. I just fertilized with blueberry special mid march this year. Cant wait.
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: I'm just a customer, like you, but I'm pretty sure that if you store the fertilizer in a shed or garage or other cool place over the winter, it ought to be just fine the following year and probably the one after that.
My blueberries are not very sweet, how can I Sweet them. ?
big jim on Mar 28, 2017
BEST ANSWER: Check your ph; adjust as needed. Granular sulfur is an easy way to alter the ph. You might want to get a soil analysis. I have a lot of coal slag buried near my plants which has caused the soil
chemistry to be out of whack and made my berries taste just awful. I'm from a commercial growing background and we used to use a lot of wood shavings at the base of the bushes to act as both weed block as well as soil improver. It's inexpensive and can be quite helpful.
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,
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?
jtpot on Nov 29, 2018
BEST ANSWER: Our blueberry bushes are located in northeastern Pennsylvania. We
fertilize them early each spring, just as the leaf buds are beginning to show
signs of new growth.
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.
how do you know which suckers to prune on my blueberry plants?
Donna D on Jul 1, 2018
BEST ANSWER: I do not prune mine and have had no issues.
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.
My soil tested 8.0 pH ...what do I add to correct the pH? Have planted blueberries last fall
Lois K on Mar 4, 2017
BEST ANSWER: Unfortunately, it would have been more advantageous to test the soil prior to planting, and amend the soil deep down at that time, but you can still adjust it; it will just have to be done gradually, over time. This is the product you need to do that: //
What is the ingredient in the blueberry fertilizer?
Nancy O on Oct 6, 2016
BEST ANSWER: This blueberry fertilizer primarily contains nitrogen, phosphate, potash, sulfur, and magnesium.

Customer Reviews

4.8 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
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 4 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 4 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 5 years ago
great product
works well and blueberry yield was increased. overall plant health was increased
May 8, 2016
over 5 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
1 year ago
Doing well
My blueberry bushes are growing and doing well. Thank you.
May 23, 2016
over 3 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
5 months ago
Great Stuff
My blueberry bushes are growing and are very healthy because of this fertilizer.
May 6, 2017
over 2 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 2 years ago