Stark® Blueberry Special Fertilizer

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Description

Blueberry Special Fertilizer – 12-12-12 Formula for Healthy Growth

Give your blueberry bushes the nutrients they need with Blueberry Special Fertilizer, a balanced 12-12-12 fertilizer designed to support strong root development, lush foliage, and high fruit yields.

Why Use Blueberry Special Fertilizer?

  • Balanced 12-12-12 NPK ratio for optimal blueberry growth
  • Enriched with essential nutrients, including sulfur and magnesium
  • Supports healthy root systems and improves fruit production
  • Helps maintain the acidic soil conditions blueberries need (pH 4.2 – 5.0)

How to Fertilize Blueberry Plants

  • First-Year Plants: Begin fertilizing after leaves reach full size. Apply 1 tablespoon in a 1-foot circle around the plant. Repeat every 6 weeks until midsummer.
  • Second-Year Plants: Increase to 2 tablespoons (1 oz.), expanding the circle to 1.5 feet from the plant. Apply when new growth begins in spring.
  • Mature, Bearing Plants: Apply 1 cup of fertilizer when new growth appears in early spring.

Caution & Soil Health Tips

  • Avoid over-fertilizing, as blueberries are sensitive to excess nutrients.
  • Ensure proper irrigation or rainfall between applications.
  • Check soil pH regularly—blueberries thrive in acidic soil (pH 4.2 – 5.0).
  • Mulching improves soil moisture retention and promotes healthy root growth.

Boost Your Blueberry Harvest with Blueberry Special Fertilizer

For stronger bushes, greener foliage, and better fruit production, use Blueberry Special Fertilizer as part of your blueberry plant care routine.

Apply as directed and follow the instructions on the label:
Download The Label

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Questions & Answers

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65 Questions
Why did you choose this?

Wanted to try something that may help my blueberries to start producing

Good stuff

To make my new blueberries happy.

to help with growth

How many plants will the 4 lbs fertilize?

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.)

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?

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?

YEs it has sulfur in it which helps lower pH.

how do you know which suckers to prune on my blueberry plants?

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.

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?

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.

I am trying to figure out how much fertilizer to use on the 4" blueberry pot.  Should I considered it to be a 2nd year  plant?

This is concidered a 1 year plant, and Those instructions are included on the label or you may download the label directly from our product page.
Blueberries respond well to small amounts of fertilizer applied at three separate applications, the first applied when new growth begins in spring, followed by a second application six weeks later. A third application is made just after harvest. We recommend waiting to fertilize until the spring.

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.

This will last years if kept dry. It breaks down if the contents get wet.

Is this fertilizer good for Blueberry Pink Icing bushes? Does this make the soil acid?

You can use this on the Pink Icing blueberry. It does not make the soil acidic to do this you would need to ammend it with an acidifier.

Best time to fertilize and then how often?

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.

Customer Reviews

34 Ratings
4.4out of 5 stars
34 Ratings

Rated 5 stars by 79% of reviewers

Rated 4 stars by 6% of reviewers

Rated 3 stars by 3% of reviewers

Rated 2 stars by 0% of reviewers

Rated 1 star by 12% of reviewers

1-10 of 34 Reviews
Rated 5 out of 5
Jul 5, 2025
Shows improvement
Since I have used it this year the blueberries have seemed to be growing larger the last year with no fertilizer use. That is the pink lemonade blueberry also. It still hasn't produced any berries. I am waiting for those to understand if they are blue or pink colored.
Rated 5 out of 5
Nov 27, 2024
A great product
I applied the blueberry fertilizer this past spring summer and fall and the results were terrific. I currently have 12 healthy plants bedded down for the winter. Waiting for spring!
Rated 5 out of 5
Feb 29, 2024
Blueberry Fertilizer
Easy to use and helps the blueberries get going in the spring.
Rated 5 out of 5
Oct 24, 2023
Helped double the size of my plants in a short time!! Great product! Just don't overfeed!! The plants ate it up!
Rated 5 out of 5
Jul 3, 2023
Perfect balance!
This is the Perfect balance of nutrients for your blueberries to have maximum health and a generous crop! I have not found anything better for my blueberry plants.
Rated 5 out of 5
Jun 25, 2023
Good fertilizer
I am using this blueberry fertilizer on my blueberry plants, as well as my Concord grapes. Both types of plants are doing well.
Rated 5 out of 5
Jan 14, 2023
Helps my blueberry plants produce great crops. I use this every year.
Rated 5 out of 5
Nov 29, 2022
Great for blueberries.
My blueberries were not doing well for a few years. I applied this in the fall mixed with compost for the last 3 years and they are back to producing again.
Rated 5 out of 5
Sep 16, 2022
My blueberries are doing well the first year. I used the fertilizer when planting and as side dress .Good healthy growth so far. Will shape / prune the blueberries over the winter.
Rated 5 out of 5
Sep 15, 2022
Very happy with this fertilizer. My blueberry is doing really good.