Rated 4.94 out of 5 based on 16 customer ratings
(16 customer reviews)


Why Use It?

Extra strength nutrient specially formulated to produce heavy weight fruits/flowers, maximize bud development and promote bud density during all stages of bloom.

Product Documents

Not Available in California

Product Description


Mono Potassium Phosphate or MKP, the Ultimate Bloom Booster. Doesn’t matter what you are using for nutrients, supplement MKP along with it during Bloom, to get results like you have never seen before at harvest. It’s Synthetic but the best and most affordable Bloom Booster on the market.

Product form:

Dry powder, water soluble

NPK analysis:


Product designation:

Standard (This means products may contain natural compounds as well as synthetic compounds popular in conventional agriculture.)

Product Comparison Results:

65% Increase in yield quality

With MKP

140% Increase in yield size

With MKP

Primary function/use:

Fertilizer without nitrogen to boost phosphorus and potassium levels.

Supports blooms, buds, flowering and fruit development.

Other product highlights:

Technical name of product is mono potassium phosphate. Effective in establishing root systems. Increases sugars in fruit crops. Can be mixed with other fertilizers.

Well suited for:

Hydroponics, soil and soil-less.

Directions For Use

When and where to use:

During all stages of bloom.


Ensure bag is properly sealed and stored in cool, dry, dark place.

For hydroponic, soil and soil-less:

Mix one (1) tsp. with one (1) gallon of water.
Mix ½ lb. with 50 gallons of reservoir water.

All items are shipped using USPS Priority Mail, unless otherwise requested and arranged by the customer, prior to order completion.Free Shipping

All orders ship within 48 hours of order confirmation and as always FREE SHIPPING in the USA. After successfully placing an order from you will receive an order confirmation email with the details of your order to the email address provided.

Once your order has shipped you will be emailed specific tracking information.

To check the status of an order please visit our “View Order” page.

Gift Cards are electronically delivered to your email address.

State of Idaho is not an option for shipping any of our products. If you are in the State of Idaho, please contact us direct.

Kelp4less Disclaimer

While Kelp4less has made every effort to ensure accuracy of information on its website and labels, Kelp4less assumes no responsibility or liability for the use and results of any of it’s products.

The purchaser and the end user of Kelp4less products assumes sole responsibility and liability for product use, results and disposal. Kelp4less makes no guarantees either express or implied.

16 reviews for MKP

  1. Rated 5 out of 5

    Stephen Canaday (verified owner)

    This product is perfect for making your own bloom booster! I replaced all of my pre-mixed dry and liquid products with the results have been amazing. My plants are covered in flowers and all of the fruits are large and tasty. This is a high quality product at a great price.

  2. Rated 5 out of 5

    Frank S.

    There are so many fancy named products out there that are basically the same product but up to 10x the cost and Kelp4Less MKP is fantastic only thing missing is WATER. So go turn on your faucet and save a whole lot of money with KELP4LESS IT’S A NO BRAINER.

  3. Rated 5 out of 5

    Jake (verified owner)

    Have been using this for two years now & will keep using it. When you need bulk this is the best & why pay more. When u need large, sweet full flowers use it!

  4. Rated 5 out of 5

    John Matthias (verified owner)

    This is a great product for putting on bulk flowers. It does the same job as name product at hydro store and less expensive. Recomend it for your plants in there blooming stage,

  5. Rated 5 out of 5

    Rich (verified owner)

    This product is so versatile it is incredible. It is the one of the main products in so many nutrients, from rooting agents to pre-flower, to end flower. Find the right ratios, and you are set . Plants love potassium and phosphorus all the time, so that is when I use it!!

  6. Rated 5 out of 5

    Gina (verified owner)

    Mkp is amazing!!! I had an outbreak of powdery mildew on my melons and zucchini plants. I let my family foliar and feed and feed my plants for about 3 weeks They were foliar feeding with and using to much nitrogen when it was getting dark and this caused my mildew problem. Mkp stopped the problem. Thanks kelp4less for such a great product

  7. Rated 5 out of 5


    This stuff is amazing what it will do foliar feeding plants, I use neem oil 3 in 1 when using it later in afternoon to prevent mildew

  8. Rated 5 out of 5

    Kim (verified owner)

    First year trying this stuff, must say plenty of flowers and fruit. Great product, great company to do business with.

  9. Rated 5 out of 5

    K.T. (verified owner)

    I bought this product for the purpose of increasing yield with my fruit. I first used it to induce flowering in a 12/12 scenario with unrooted clones along with the grow pack from kelp4less. The mixture produced roots in 9 days and also induced the showing of sex of the plant in 10. I am pleased with the product. Water soluble, easy to mix and the packaging is sturdy. For the price, it can’t be beat. I will definitely by again.

  10. Rated 5 out of 5


    I bought this product to use with my Aquaponic system. It’s perfect – I always need more potassium and phosphate. I’ve seen it sold at Hydro stores for as much as $400/lb, here it’s only $18 a pound!

  11. Rated 5 out of 5

    Bobrobertoe (verified owner)

    Inexpensive, not cheap, high end product for fat flowers and a non skinny wallet. I have been mixing in the 10 gram B vitamins for a while. A friend just bought a new product called sonic bl–m that looked amazingly like what I’ve been mixing for a while, only his was double the price. Guess it’s a little late to apply for a patent. Mix your own and be happy.

  12. Rated 5 out of 5

    Edward young

    Shui Yin September 2, 2014

    I started using Amino Acids along with Miracle Grow,and my plants have really taken off – great growth.

    In mid August I dropped off the Miracle Grow, and now I’m feeding with MKP and Amino Acids to aid in the flowering of my plants. The flowering process has really taken off. Instead of flowers just at the end of each stalk, now each stalk is covered with flowers all the way from about 6in. from the base all the way out to the tip end.

    Thanks for MKP, and Kelp4Less – the best.

  13. Rated 5 out of 5

    Dane (verified owner)

    MPK from Kelp4Less is a little known part of my secret recipe. I add it during weeks 3-8 of the bloom cycle to enhance my flower density as it provides high levels of Potassium (K) and Phosphorus (P). Phosphorus can also be found in Kelp4Less Bat Guano. From week 5-8 I supplement just Bud Hardener from Kelp4Less every other watering then MPK. I never apply these two products together as Bud Hardener is also high in Potassium (K) and it may burn my plants. I am also careful to scale back my use of the Middle and Late Bloom packs when using MPK & Bud Hardener. I use the Packs at the lower end of the label guidelines to around 1 tsp per gallon. For reason that these packs also contain Phosphorus (P) and Potassium. If Potassium (K) is deficient or not supplied in adequate amounts, growth is stunted and your yields will be imminently reduced.

  14. Rated 5 out of 5

    Closetgrowth (verified owner)


    I run 1 teaspoon of kelp4less bloom pack in flower, along with a 1/2 teaspoon calmag(because i use creek water) and a 1/4-1 teaspoon mkp(be careful, start out at 1/4 teaspoon, or less) every time i water my girls in their 8 gallon planters…

    I have some of the fattest plants around! I know it has “ALOT” to do with the phosphorous, and potassium levels of their mkp, that help produce the biggest jaw dropping fruit ive ever grown.

    Fyi, Iam running an old school diamond lumenarc 3 reflector(imho,The best reflector ever made) along with a lumatek 1000 running a hotilux 1000 on “super mode”(1150 watts) on a 6′ track, and of course with a light mover setup.

    18 Years of trial and error, and messin’ with all the popular grow items on the shelves of my local hydro store, and nothing has passed up the results iam having using kelp4less products.

    My plants have exceeded my expectations, and talk about ease of operation, Almost Too easy. It doesnt get any better than this folks. And the highly experienced people at kelp4less are the coolest! High 5 to ALL OF YA!! Waving at the Organic Mechanic!! Your so damn funny!! Love your videos!! lol!


  15. Rated 5 out of 5

    John D (verified owner)

    Use this in last 5 weeks of bloom and get fantastic results. Start small, like half and increase with regular feeding.

  16. Rated 4 out of 5


    The stuff burned my plants. Its a very strong white powder. Go easy. It dose seem to be doing some good. Im also using Mammoth P with it. I dont know if thats overkill.

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