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Seedling Soil

Seed Starting Superstar

Be your best plant parent with our seedling mix powered by biochar. Scientifically crafted for germination & propagation.

$19.99
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Free shipping on orders over $60

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Seedling Soil

$19.99

Gives Seeds the Best Start

Gentle Moisture Control

Soil That Feeds Your Plants

Earth-Friendly from the Start

Product Details

NUTRIENT DENSE

Boosts soil aeration, drainage, and nutrient uptake to help houseplants flourish

LIVING SOIL

Fortified with beneficial fungi & microbes to help promote healthy root development and lush foliage

SUSTAINABLE

Made from eco-friendly, high-quality ingredients (biochar, compost, mycorrhizae, pine bark fines) and is free from peat & synthetic additives.

MISSION-DRIVEN

Our carbon-neutral blend helps fight climate change and is perfect for all types of houseplants, including foliage plants, flowers, ferns, herbs, and tropicals

RESEALABLE

Plastic neutral packaging in convenient sizes for indoor plant parents

Ingredients

Biochar

A horticultural charcoal that increases nutrient retention, hosts beneficial microbes, and stores carbon in the soil.

Mycorrhizae

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

Worm Castings

Nutrient-rich organic matter produced by worms that provide plants with essential nutrients.

Compost

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

Bark Fines

A byproduct of the mulch industry which enhance soil structure and improve aeration.

Sand

Has large grain size and coarse texture to support soil drainage.

FAQ

Why is Rosy Soil made without peat moss?

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.

How is Rosy different from other soils?

Rosy’s indoor potting soil 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.

How is Rosy Soil Earth friendly?

We use carbon-negative, organic ingredients to create the best indoor plant 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 house plant 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.

What is biochar?

Biochar is nature’s soil supercharger — a form of carbon that’s created by heating organic material (like wood or plant matter) in a low-oxygen environment.

Think of it as a sponge-like charcoal made for plants. It improves soil structure, helps retain water and nutrients, and creates a thriving home for beneficial microbes. It’s also incredibly stable, meaning it stays in the soil for hundreds (even thousands!) of years — all while capturing and storing carbon that would otherwise enter the atmosphere.

Unlike peat moss, which is strip-mined from delicate wetlands, biochar is regenerative and climate-positive. It’s science-backed, time-tested, and foundational to everything we do.

Can I add Rosy to my current potting soil?

Yes! You can add Rosy to your current houseplant potting soil — whether it’s an inorganic or organic potting soil mix, cactus or orchid mix, or otherwise. 

Doing so will help you refresh your old soil and revive its benefits for plant care. 

Alternatively, you could directly replace your current houseplant soil mix with Rosy.

How many pots will a bag of Rosy Soil fill?

Our 8 Quart bag of Rosy indoor potting mix will fill:

4 to 6 medium 6" pots

Our 4 Quart bag of Rosy indoor potting mix will fill:

2 to 3 medium 6" pots

And unlike traditional indoor potting mixes, you won’t need to replace the soil every year due to compaction.

Soil Mates: Plants That Love This Mix

Our Seedling Soil is crafted for your plant's very first chapter — light, breathable, and full of natural nutrients to help seeds sprout strong and steady.

It’s perfect for starting herbs, veggies, flowers, and microgreens, and gives tiny roots the support they need to grow with confidence.

Best for starting:

Basil, Mint, Cilantro, Parsley, Oregano, Lettuce, Kale, Arugula, Tomatoes, Peppers, Marigolds, Zinnias, Cosmos, and microgreens like Radish, Broccoli, and Sunflower.

Once your seedlings are established, we recommend transplanting them into a garden bed or larger pot using a garden soil and a sprinkle of Biochar Booster — so they can keep thriving in the next stage of growth.

Because even little sprouts need room to grow.

Good Soil Isn't A Miracle

Ready to Use - Plant Care Made Easy

No mixing, no amendments, and no guessing. Our pre-blended soil is optimized for all houseplants, so even new plant parents can pot with confidence.

Nutrient Dense, Living Soil

Scientifically blended for lush, thriving plants — with biochar to improve nutrient retention, drainage, and long-term soil health. Your plants grow better because your soil is better.

Peat-Free & Eco-Friendly

Every bag captures CO₂ and helps fight climate change. Unlike most potting mixes, Rosy Soil is free from peat, plastics, and synthetics — making it safe for your plants and the planet.

Us vs Them


Not all soil is created equal — and what’s in the bag really matters.

Most traditional soils rely on peat moss — a non-renewable resource mined from fragile wetlands. It’s harmful to the planet, and not great for your plants either. Peat compacts over time, repels water when dry, and can even invite pests.

At Rosy, we’ve created something better. Our soil is powered by biochar and crafted from high-quality, regenerative ingredients that nurture your plants and help heal the planet.

Because if it’s not Rosy... it’s just dirt.

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average rating 4.9 out of 5
Based on 51 reviews
  • 5 Stars
    45 Reviews
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100% of reviewers would recommend this product to a friend
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51 Reviews
Reviewed by EeeJayCee
Verified Buyer
Review posted
I recommend this product
Rated 4 out of 5

I was REALLY skeptical about this seed starting mix…

...upon opening this bag and seeing the makeup of it. First off, it is very, very black. I've never seen a soil mix so black. Is it the biochar?? It is also very well-draining; the water goes right through because it doesn't appear to have anything in it to hold onto the water (vermiculite, coco coir, peat moss). I get that it has all the good stuff that you want in a seed starting mix (compost, worm castings, mycorrhizae). But the very large pieces of bark that you find in this (and it's throughout the whole bag; it's not just a matter of the finer components settling to the bottom and then the bigger, "lighter" components remaining at the top) made me really question whether this would even work as seed starter. But I'm taking a risk, because if I give this seed starter a couple of weeks and still nothing grows, that pushes my seedlings that much further into the short spring growing season I have where I live (desert of SoAZ). At the same time, I've been trying to start seedlings indoor for a few seasons now, and often unsuccessfully, even with the finer, lighter seed starting mix of other brands and mixed with worm castings and coconut coir, mind you. Even that has given me choppy results, so at this point, really, what do I have to lose (again)? Half of the time seeds will germinate "on time," the other half of the time the seeds take forever to germinate.

Well, it's been only 3 days and I am VERY pleasantly surprised. Of the 15 different seedlings I planted, about 4 of…

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

Seed Starter Mix Without Soil

I start veggie seeds every February using starter mix without soil. Many people don't realize that everything that seedling needs for the first few weeks is right inside the seed. No nutrients are taken up from the surrounding soil until feeder roots are well developed. This seed mix is great because it's sterile -- no fungus or bacteria to damp off the baby plant -- and it has a light nutrient content that nourishes the seedling after its roots finally start to develop. It holds water without getting soggy or heavy. So you can start your seeds in 3 inch pots if you want, no transplanting until you're ready to put them out in the garden in April.

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

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 almiele
Verified Buyer
Review posted
I recommend this product
Rated 5 out of 5

Great seedling soil!

I love this soil! Holds moisture well especially for germinating seeds! Biggest plus is the organic additives. No peat moss or synthetic fertilizers whatsoever. My seedlings started to germinate in three days and sprouted!

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

Nice packing and good quality soil

This is a resealable bag which is useful to me to properly store the unused soil for later. As advertised I noticed less transplant shock for my pothos which I propagated in water first before transplanting in a pot. My plant looks healthy.

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