Rated 4.8 out of 5
Based on 14 reviews


Regular price$29.99
✓ Scientifically blended for robust root development
✓ Proudly peat-free with carbon-capturing biochar
✓ Made from natural & upcycled ingredients

  • NUTRIENT-PACKED: Enhances soil aeration, drainage, and nutrient absorption, providing the ideal foundation for robust seedling and propagation growth.
  • RESEALABLE: Thoughtfully packaged in plant-based packaging, our Seedling Mix is available in a convenient 8lb size, making it perfect for nurturing young plants.
  • SUSTAINABLE: Crafted from eco-conscious, premium ingredients such as biochar, worm castings, mycorrhizae, pine bark fines, sand, and compost, our Seedling Mix is completely free from peat and synthetic additives.
  • LIVING SOIL: Enriched with beneficial fungi and microorganisms, our Seedling Mix is designed to foster vigorous root development, ensuring your seedlings and propagations thrive.
  • MISSION-DRIVEN: Our carbon-neutral blend contributes to the fight against climate change and is tailored to meet the specific needs of all types of seedlings and propagations, including vegetables, flowers, herbs, houseplants and more.

Biochar is a horticultural charcoal that holds onto oxygen and nutrients while also storing microbes and carbon in the soil.

Worm Castings are nutrient-rich organic matter produced by worms that provide plants with essential nutrients.

Mycorrhizae are beneficial microorganisms that form a symbiotic relationship with plant roots, allowing the plants to absorb more nutrients.

Sand has large grain size, coarse texture, and high silica content to support soil drainage.

Pine Bark Fines are a byproduct of the mulch industry which enhance soil structure and improve aeration.

Compost helps reduce waste in landfills by turning green waste and wood waste into a useful source of nutrients for plants.


Seedlings: Select a well-draining seed tray or planter and fill it with Rosy Soil. Follow your seed packet's instructions regarding sowing depth and spacing. Avoid over-seeding as too many seeds in a small area can hinder growth.

Propagation: Partially fill a well-draining pot with Rosy Soil. Gently place your cutting into the soil, ensuring the roots are covered. Cover with additional Rosy Soil, leaving at least an inch at the top for easy watering.


Water slowly and thoroughly unitl it drains from the bottom. Aim for light, even moisture throughout the mix.


Place the tray or container in a warm location with indirect sunlight or under grow lights. Keep the soil consistently moist, but not damp, and adjust watering as needed.


Once the seedlings or propagated cuttings have grown and the weather permits, transplant them into larger pots or your garden.

At Rosy, our entire supply chain has a net neutral carbon footprint!


We maintain an eco-friendly system (from production to delivery) by curating the most sustainable ingredients (like carbon negative biochar), packing processes, and shipping. 

In fact, every bag of Rosy indoor mix helps captures CO2 from the carbon cycle.  

So, our seedling mix is a positive resource for your garden and the environment. 

Find out more in our Life Cycle Assessment.

Guaranteed Analysis 0.70-0.04-0.06

Total Nitrogen (N) ..................................0.70%

     0.70 % Water Insoluble Nitrogen

Available Phosphate (P2O5)...................0.04%

Soluble Potash (K2O).............................0.06%

Derived from compost, worm castings


Soil Amending Guaranteed Analysis

Active Ingredients

     Rhizophagus irregularis.........4 propagules/g

     Funneliformis mosseae..........2 propagules/g

     20% Wood biochar

Inert Ingredients

     80% Total Other Ingredients (inert as non-plant food ingredients)

Ingredients: compost, bark fines, biochar, sand, worm castings, and microbes

Biochar may reduce soil density and increases soil aeration. Mycorrhizae may promote root mass expansion and nutrient efficiency.

Enriched With Root-Boosting Biochar

Peat And Synthetic Free

Helps With Transplant Success

Resealable Bag Made From Plants


Footprint Carbon Neutral + 3.38 kg
Ingredients Premium, natural-based, and eco-friendly Low-quality, non-renewable, and synthetic
Packaging Resealable, recyclable, and made from plants Flimsy plastic made from fossil fuels
Formulation Designed by scientists to naturally support healthy plant growth Designed to cut costs and drive profits


Peat moss has been a common ingredient in commercial potting mixes since the 1960s. However, it's obtained by extracting peat bogs, which are vital ecosystems that store carbon. At Rosy, we believe there's a better way. So, we've developed our blends with alternatives that are effective and sustainable.

Rosy’s seedling mix is all-natural, peat free, and made from biochar. 

We’ve consciously sourced our ingredients not only because they’re great for your plants but also because they’re good for our planet

Unlike traditional potting soil ingredients that are environmentally taxing, our biochar potting mix only contains natural and carbon-negative amendments.

Read additional information about Our Mission.

We use carbon-negative, organic ingredients to create the seedling potting mix.

Typically, these organic materials are sent to a landfill, where they release methane and CO2 — two potent greenhouse gases. But by redirecting these organic materials from landfills and stabilizing their carbon structure, we prevent the release of those greenhouse gases.

Essentially, we turn our soil into a carbon sink, which means it helps to remove CO2 from the atmosphere.

Discover more about what we mean by Earth Positive on Our Mission page.

average rating 4.8 out of 5
Based on 14 reviews
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14 Reviews
Reviewed by A D.
Verified Buyer
I recommend this product
Rated 4 out of 5
Review posted

Exquisitely rich mix, just watch the pine pieces

I have been studying this seed starting mix for a while now. The $27 cost of this bag gave me a bit of sticker shock, but you know the saying 'You get what you pay for'. I have had horrible gnat issues in lesser brands so I wanted to try something better. I read the reviews so seeing the very rich, very black makeup of it was not a surprise. It was welcome. I love that it doesn't have that vermiculite or perlite mess inside as it doesn't need it.

But the only reason I'm giving it 4 stars is the large pieces of bark you find in this. It's all through the whole bag and it's not something I would expect to see for a seed starting mix. I have had to pick out several larger pieces that just are bigger than the size of the tray holes.

But I'm going to give it a chance. I'm going to believe in all of the good wonderful stuff that's in there now besides that. But realistically if you're planning on using this a lot for seed starting, it might need to be shifted to eliminate all of those pine pieces.

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Reviewed by Gail
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

The best soil - ever - for my microgreens

At the recommendation of the Rosy Soil people I bought the seedling soil for my microgreens. I love the rich dark color. I had a feeling that the bio char and worm castings would be beneficial and they are. My micro greens were ready 2 days earlier than usual. My husband and I both felt their flavor was improved!

I love that this soil does not have that awful chunky white rocky stuff in it - forgive me, I forget what it's called but it's in most soils. With Rosy Soil I'm getting 100% growing medium that's rich and robust.

Historically one uses some sort of seaweed fertilizer for micro greens. I have not felt the need to do this with my Rosy Soil - which is nice, it's one less thing to fuss with, and one less expense. I'm getting highly nutrient dense micro greens with just this great soil.

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Reviewed by Ken
Verified Buyer
I recommend this product
Rated 4 out of 5
Review posted

Good Looking Soil

I was excited to receive my seeding mix. It has microbially active soil for germination and propagation. It is an eight quart bag. This will come in very handy when I start seeds in our greenhouse in just over a month. I grow a lot of pepper plants from seed. This might make them grow better. I bag was easy to open with a tab to pull. The bag also has a nice ziplock to close it back up after using. The soil looks awesome. I filled a four small pots and planted some jalapeno seeds to see if they will grow. I gave it a 4 star rating but if I could wait a couple months to see how it works it might get a better rating or maybe a lower rating.

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Reviewed by DIYBob
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Rich light soil for pots, planters, and raised beds

I used this soil as an amendment to my patio pots and planters, as well as in my raised garden beds to boost the microbes and other helpful life in my soil. The package is beautiful and functional. The sides and back provide lots of information. There is a handy pull tab on the top back side that actually worked - a strip came off that then allowed me to pull open the bag, use what I wanted, then reseal. A great product, well done.

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Reviewed by Elizabeth G.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Good Quality Soil

I ordered this soil to test for my house plants. I've heard a lot of good things about this soil, and had to try it for myself. It has a good amount of aeration and nutrients for my propogated babies.

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