A peat-free organic soil conditioner and amendment

A revolutionary organic soil conditioner and amendment made from upcycled, organic paper fibers. Prime is OMRI listed for organic growing and is the best soil for sustainably minded, and organic gardeners. This growing media is lightweight, and significantly less dusty than traditional soil mediums. Prime is also the cleanest, most consistent soil on the market, with no pathogens, weed seeds or other heavy metals and harmful ingredients and every batch is tested to ensure quality and optimal performance. PittMoss Prime is a soilless growing substrate that also requires significantly less water and applied fertilizer because of its ability to retain and better manage applied resources, evenly distributing them throughout the porous particles to be more available to the plant’s roots. PittMoss Prime is the best soil conditioner with high amounts of readily available carbon, perfect for creating a living soil environment that is chalk-full of soil biology! Prime is a wonderful and eco-friendly soil amendment that replaces sphagnum peat moss, perlite and vermiculite for gardeners looking to blend their own mix, or to improve soil conditions. PittMoss Prime is a great option for improving and establishing lawns, planting trees and shrubs, and replacing peat in potting soil blends. When used as a peat substitute for potting soils, PittMoss recommends using at least 30% – 50% Prime with a blend of compost and other amendments.

How it’s Made: Prime is made from PittMoss’s proprietary and revolutionary recycled paper fiber. PittMoss engineers this fiber to have incredible properties that allows plants to grow big and strong, even under stressful conditions. This revolutionary product is the most sustainable and high-performing growing media on the market made 100% in the United Sates. PittMoss sources all paper ingredients from local recycling facilities and hand sorts each batch to ensure zero contaminants. Each batch is hand sorted and processed in Ambridge, PA using PittMoss’s custom and patent-pending machinery. PittMoss conducts extensive testing on each batch, and proudly shares information on heavy metals and more with the public via our blog and published research, and as requested.

Ingredients: 99.9% PittMoss paper fibers, with small amounts of organic bark.

Product Benefits

  • Each cubic foot of Prime saves roughly 10 kg of carbon
  • Developed and routinely tested by leading soil scientists
  • 100% Peat-Free
  • OMRI listed for organic gardening
  • Carbon-rich soil amendment to encourage a living soil environment and support regenerative agriculture
  • Lightweight material easy to carry around
  • Lots of air space to aerate existing mixes and encourage root growth
  • Reduce your resources with better water absorption, wicking and decreased runoff
  • PittMoss fibers are manufactured 100% in the USA – supporting green manufacturing

Product Results

Product Reviews

Customer Reviews
4.8 Based on 40 Reviews
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Filter Reviews:
    Carrie C.
    US US

    Have not used it yet

    Joe lamp’l recommended it so I’m sure it is great

    David L.
    US US


    Love the product..I mix it into my flower beds and in the spring the plants take off...and I think it helps reduce the amount of water needed....

    Dean P.
    US US

    So far so good

    I recently potted-up my citrus trees as I brought them in from the outside to overwinter in my living room. I wanted a growing medium that wouldn’t smell and I liked the concept behind PittMoss. I amended the enhanced potting mix (the organic was sold out at the time) and so far I’m happy with its water retention ability. Time will tell if the ph of the growing medium is suitable for my citrus, but a couple weeks in and everything is working well.

    David B.
    US US

    Seems to be adequate

    This is the 2nd bag I have bought. While it is still very early to determine how effective the product is, I generally believe it is good to use. I have planted a lot of shrubs this year, so I have been putting one or two handfuls in the bottom of the hole, along with handfuls of alfalfa pellets. There are no bad effects so far, but it is hard to tell if the product is effective.

    US US


    It’s working great so far, when are you going to start selling it in Utah? $40 dollars every time I buy a bag!

    Have a question about this product? PittMoss will answer!

      Is there an NPK ratio available?
    1. Q Is there an NPK ratio available?
      Asked by Doug on October 28, 2022 10:33 am
      Answered by the admin

      Hi Doug, Prime does not include any nutrient value. If you are looking for fertilized products, p... Read more

    2. Do you supply this in bulk? I'd love to see these in several places around the West Coast! Thanks!
    3. Q Do you supply this in bulk? I'd love to see these in several places around the West Coast! Thanks!
      Asked by Ginger Waring on February 28, 2022 4:23 pm
      Answered by the admin

      Yes, we can sell material in pallets or supersacks, which are 75 cubic feet

    4. Do you recommend Prime for seed starting?
    5. Q Do you recommend Prime for seed starting?
      Asked by Danielle on January 24, 2022 10:41 pm
      Answered by the admin

      Prime is safe to germinate with, but the young seedlings will need immediate additional nutrients... Read more

    6. Can you use Prime for winter seed sowing, by itself? I was looking for a potting mix, rather than so... Read more
    7. Q Can you use Prime for winter seed sowing, by itself? I was looking for a potting mix, rather than...... Read more
      Asked by Bea Helft on January 18, 2022 11:32 pm
      Answered by the admin

      The organically derived nutrient supply in Plentiful should not be excessive for seed starting, b... Read more

    8. What is the CEC value of PittMoss?
    9. Q What is the CEC value of PittMoss?
      Asked by Jeremy E. Schissler on November 29, 2021 8:50 am
      Answered by the admin

      PittMoss shows moderate levels of CEC, 10-15 meq/100 grams. The typical lab value is measured as ... Read more

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