Stark® Raspberry Food

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Description

Strengthen roots and boost yields!

This specially formulated 20-21-20 raspberry fertilizer is recommended for use on new or established beds. Mix and dissolve 4 ounces of water-soluble fertilizer per 1 gallon of water. Use in early spring as directed for red, gold, purple and black raspberries. The package treats a linear 80-foot area.

Always follow the instructions on the label:
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Questions & Answers

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42 Questions
Why did you choose this?

Give these and the ones I have a good start.

Planning new Raspberrys ..

to give the young plants a good start

Give my plants a head start

How often during the season do you apply this product? Thanks

I applied this product only at the beginning of the spring . . .

I'm in zone 7 / 7B.  I understand the directions state to apply in the spring.  It is the middle of March and our weather has been insane, 1 day 70 degrees, the next few days highs in the 40's.  When is best to put this down? Wait until April, do it now ?  Thank you.

I would look at weather forecast for next 2 weeks. If the low is 30 or above, I think it’s okay to put in fertilizer. If you want to play it safe, wait and see at beginning of April and check the weather forecast again and see if the temp has any days below 30 degrees as the low. If there are no such days, then it’s “go” time.

What is best way to prevent weeds in raspberry beds?

We put a fluffy, non-compacted, 4-6" layer of straw (not hay!) across the raspberry bed. A few weeds came up but they had no solid ground to root into so they were simple to pull when they emerged.

Can this fertilizer be used on established beds? My plants are not producing...very little raspberries. This is an older bed. I'm planning to plant some Stark Latham raspberries in the spring, too. Thanks for your help!

Raspberries often benefit from heavy cultivation and pruning. Starks raspberry food has been doing very well for me. I also add a little compost each season.

Shall I put landscaping fabric in between the raspberry plantings?

If you don't want anymore plants, that's fine. Raspberry plants are known for coming up from the roots, or "sucker plants." This obviously creates more plants.

How soon can you water after you use the fertilizer?

I don't fertilize if we are having hot dry weather. I like the ground to already be moist through rain or watering. Mix the dry raspberry fertilizer with water according to instructions on package. After fertilizing, if it hasn't rained for 2 or 3 days you can water your raspberry plants. I use the raspberry fertilizer about 3 times in the Spring to early Summer. Very healthy plants with tons of berries. Have fun.☺

Is this safe if animals drink the water that was in plants?

Hi Kimberly - I would assume that this is not safe for animals to drink. The MSDS states that in case of ingestion for humans to rinse mouth and drink plenty of water. Do not induce vomiting. Call a POISON CENTER or doctor/physical if you feel unwell. If your pet has drank the water and seems unwell I would recommend calling your vet for advice.

what are the main ingredients in SB Raspberry Food?

It's a 20-21-20 fertilizer. Don't have more detail. Increased my yield.

is this the same stuff one would use for fruit trees ?

I used this only for my raspberries since I wanted to be able to see how well it actually works. A couple of other reasons I didn’t try it in my fruit trees are:
1.). I purchased my fruit trees when they were young. I planted in areas where a lot was done to augment the soil because the area had been previously occupied by honeysuckle. I want to give my trees (and anything I plant) as best of a start as I can provide to support healthy growth and development.
2.). Since I trusted Stark Bros reputation and purchased trees from them I also extended
trust Stark Bros would sell products formulated for the items advertised.

All of that said (exhale :-) ), you may well be able to use the Stark Bros Raspberry Food for your fruit trees as long as you understand the there is minimal difference in Iron percentages but a greater difference in available phosphates and available potash (ab double the difference in this raspberry food - higher).

All of that said (exhale), you may very well be able to use the Stark Raspberry Food for your fruit trees. There is minimal difference in nitrogen provided between the raspberry food and food I’ve used for fruit trees. Ther

Is food the same as fertilizer?

My understanding is that fertilizer is a general application. The Stark's raspberry food, is designed specifically for raspberries; mainly N P K. Hope this helps

Customer Reviews

35 Ratings
4.6out of 5 stars
35 Ratings

Rated 5 stars by 80% of reviewers

Rated 4 stars by 11% of reviewers

Rated 3 stars by 0% of reviewers

Rated 2 stars by 3% of reviewers

Rated 1 star by 6% of reviewers

1-10 of 35 Reviews
Rated 5 out of 5
Jul 19, 2025
Great results
I had hoped to grow my black raspberries organically, but in the past using compost alone, the plants just didn't grow like I wanted them to. So when I started this new planting I tried this special raspberry fertilizer, and it made a tremendous difference. My new plants have grown like crazy this season, and I am really looking forward to a ton of berries next year. I've been reading up on proper pruning so my plants will produce well next year.
Rated 5 out of 5
Jul 3, 2025
Easy to use, working well. Putting on other plants that it can be useful for as well.
Rated 5 out of 5
Jun 1, 2025
LOVE, LOVE, LOVE This Fertilizer!!!
This is the only fertilizer I use on my raspberries.
I love them & they are my babies, so I want to take care of them as well as I can. That's why I use this fertilizer. It is absolutely amazing to see how this works on them. Our raspberries bloom twice a year & they thrive immediately after I apply it. Some of the stalks grow as tall as 8 1/2 feet & we get over 5,000 berries a year!!!
Don't hesitate to try this!!
Rated 5 out of 5
Aug 7, 2024
Awesome starts, looking forward to many seasons of deliciousness!
Rated 5 out of 5
Jun 1, 2024
Great Product
Excellent way to start raspberries off right. Stark has formulated the perfect fertilizer mix for helping me succeed.
Rated 5 out of 5
Sep 5, 2023
Made the grow and produce heavy
Really seemed to help in there growth these did much better with this than what I had planted last year not using.
Rated 5 out of 5
Jan 14, 2023
I have used this for 2 seasons and it is helping my berries thrive and produce super crops.
Rated 5 out of 5
Oct 10, 2022
What a spring bloom time we had!
I fertilized the cultivated and the wild raspberries this year. If not for the drought in Massachusetts, we would have had a great crop. No watering limited the harvest, but what a spring bloom time we had! This made a huge difference and I plan on using it next year and hope for a better season.
Rated 5 out of 5
Sep 15, 2022
Very good product. Omg, my white raspberries blooming like crazy and have large berries.
Rated 5 out of 5
Jan 26, 2020
Grow great raspberries
We have fifty plants of raspberries and use this product every spring. Very healthy plants, Five feet tall, makes for easy picking, abundant berries for us and neighbors for fresh, canning and jam. It works.