Indoor Potting Mix
Indoor Potting Mix

Well-draining, Airy Soil for Ferns

An all-natural, fertile potting mix suitable for ferns
Rated 4.9 out of 5
Based on 65 reviews
Regular price$16.99
Tax included.

☑ Boosts soil aeration to enable easy oxygen access
☑ Optimizes water drainage to prevent root rot
☑ Nutrient-rich fern potting soil with Earth Positive ingredients
☑ Contains no peat moss, coco coir, perlite, pumice, or vermiculite!

Vegan Compost

Our plant-based, aged compost is ideal for any indoor plant, including ferns.

Here’s why:

It’s rich in organic matter and provides the optimum soil structure and drainage for growing ferns.

It has essential plant nutrients, like nitrogen and potassium, minimizing the need for synthetic or chemical fertilizers.

It provides the right conditions for beneficial microbes to thrive.

Carbon-Negative Biochar

Biochar is a light porous substance that improves soil drainage and locks in nutrients. 

It keeps your soil fertile for longer periods.

The best part?

Every ton of biochar produced removes three tons of CO2 from the carbon cycle. So it’s Earth Positive — unlike conventional soil additives, like sphagnum peat moss and perlite.  

Root Boosting Mycorrhizae

Mycorrhizae (mahy-kuh-rahy-zee) are plant-friendly fungi that improve water and nutrient access for your indoor plant.

Even better?

The fungi release a gum-like substance (called glomalin) that helps lock in moisture, making it ideal for moisture-loving ferns.

Step 1: Pre-Moisten

Pre-moisten your Rosy fern soil before planting your ferns.


Put the soil mix in a container and sprinkle water until it retains enough to release a few drops when pressed.

Step 2: Pot or repot

Fill up 1/3 of a well-draining pot with the moist soil mixture. 

Step 3: Plant

Gently release your indoor plant from its current soil without disturbing the root ball. 

Then, center the plant into the container with Rosy fern soil mix. Fill the remaining space with pre-moistened soil, leaving an inch at the top for easy watering. 

Step 4: Water

For the first watering, water the fern from the top and let the excess drain out. 

For future watering, we suggest bottom watering (by placing the pot in a tray with water). This allows the soil to absorb water evenly. 

Occasionally, water the soil from the top to flush excess salt deposits.

Rosy’s entire supply chain has a net negative carbon footprint!

How did we manage that?

We maintain an Earth Positive system (from production to delivery) by curating the most sustainable ingredients (like biochar), packaging, and shipping processes.

In fact, every bag of Rosy soil mix traps more than 2 kg of CO2 from the carbon cycle!  

This makes our fern potting mix a positive resource for your garden and the environment. 

Read our 2022 Life Cycle Assessment to find out more.

Guaranteed Analysis 0.72-0.22-0.37

Total Nitrogen (N) ..................................0.72%

     0.72 % Water Insoluble Nitrogen

Available Phosphate (P2O5)...................0.22%

Soluble Potash (K2O).............................0.37%

Derived from green compost and wood waste compost


Soil Amending Guaranteed Analysis

Active Ingredients

     Rhizophagus irregularis.........2.3 propagules/cm3

     Funneliformis mosseae..........2.1 propagules/cm3

     30% Biochar derived from pine wood

Inert Ingredients

     70% Total Other Ingredients (inert as non plant food ingredients)

Biochar reduces soil density and increases soil aeration.

Mycorrhizae may promote root mass expansion and nutrient efficiency.

Rosy Soil vs Other Soil Brands

Carbon Footprint - 2.05 kg + 3.38 kg
Promotes Soil Biodiversity 🐛 🚫
All Natural Ingredients 100% ???
Peat, Synthetics, And Fillers 🙅‍♀️ 🤷‍♂️

Fern Soil & Care Guide

Ferns are flowerless plants with intricate foliage and a frond leaf (divided leaf) structure. 

Most fern stems (also called rhizomes) grow horizontally, making them perfect indoor plants. 

But some varieties, like tree ferns, have elevated rhizomes and grow vertically.

Popular indoor fern varieties include:

  • Boston fern (aka Sword fern or Nephrolepis exaltata)
  • Maidenhair fern (Adiantum)
  • Japanese holly fern (Cyrtomium falcatum)
  • Staghorn fern (Platycerium) — a popular variety of epiphytic ferns
  • Button fern (Pellaea rotundifolia)
  • Bird’s Nest fern (Asplenium nidus)

Fancy an evergreen fern for your garden?
Suitable outdoor fern varieties include:

  • Autumn fern (Dryopteris erythrosora)
  • Asparagus fern (Asparagus setaceus)
  • Cinnamon fern (Osmunda cinnamomea)
  • Ostrich fern (Matteuccia struthiopteris)
  • Lady fern (Athyrium filix-femina) 

You can even grow some outdoor fern varieties (like ostrich fern) inside, but they need specific conditions to flourish as houseplants.

Here’s what you need to know to grow fern plants:

1. Choose the Right Soil for Ferns

Ferns have a shallow root system and require potting soil mix that’s:

  • Loose to support their fibrous root ball.
  • Moist and well-draining (ferns thrive in damp and humid conditions).
  • Rich in organic matter to provide the nutrients for fern growth.

Looking for the best soil mix for growing ferns?

Instead of regular potting soil, use a soil mix specifically crafted for ferns, like Rosy’s fern mix.

This well-draining soil mix is perfect for all types of ferns — perennial ferns, evergreen ferns, tropical ferns, or even a deciduous fern.

2. Maintain Adequate Moisture Levels

Most ferns need moist soil to thrive.

How do you ensure optimum humidity when growing ferns indoors?

Here are a few pointers to help you grow fern plants:

  • Water your potted fern when the top 2-3 inches of soil is dry to keep the soil moist. Overwatering could cause root rot.
  • Place a humidifier near a potted fern. It’ll help prevent the browning of leaves (common in the southern maidenhair fern).

For dry regions, consider a fern plant that prefers low humidity, such as:

  • Bird's Nest fern
  • Boston fern
  • Holly fern
  • Staghorn fern
  • Rabbit’s Foot fern

3. Provide Indirect Light Exposure

Most indoor and outdoor fern varieties require plenty of indirect sunlight year-round, especially during fall and winter.

Bottom line?
Plant ferns in areas with dappled shade (or partial shade).

Some hardy fern varieties, like northern maidenhair fern, can survive under full sun. 

But direct sunlight can dry the soil and damage fern frond leaves.  

4. Other Fern Care Tips

Some best practices for a healthy fern plant include:

  • Pick indoor and outdoor ferns according to your region. In the US, go for native fern varieties like lady fern or Christmas fern (Polystichum acrostichoides).
  • Prune dead frond leaves periodically to promote new growth.
  • Some ferns, like maidenhair ferns, need alkaline soil. If you have acidic soils, add limestone to increase the pH. 
  • Periodically add mulch to your indoor fern potting soil to increase moisture retention and organic matter.
average rating 4.9 out of 5
Based on 65 reviews
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65 Reviews
Reviewed by Lee Y.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Well worth using!

I used Rosy soil to plant succulents. I mixed it with a little bit of succulent mix and within 2 weeks, the succulents had grown larger and had new growth shoots. I bought more to transplant herbs for the spring. It's well worth the price and it's all I'll buy now.

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Reviewed by Michele J.
I recommend this product
Rated 5 out of 5
Review posted

Super Rich

The soil is super rich. I just had to transplant a lot of my plants and you can tell they love the soil

My plants thank you

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

Great product!

I waited a bit to post to see how my Alocasia were handling the change. They absolutely love Rosy Soil. Every single one of my Alocasia are pushing out new leaves and retaining more of the older ones. It stays airy while retaining a fair amount of moisture. I've also used it in a self-watering pot with a philo camposportoanum and it's sent out tons of new leaves and loads of aerial roots. It's so happy.

Great product, my plants love it. And I'm so happy to be using a sustainable resource for my potting soil now. I'm allergic to coconut (and even cor processing is horrible for the environment) and peat is such a precious resource in the environment that makes them it's really disheartening to have limited options. Allergy meds and tons of salt from processing cor or slowly destroying a natural wonder were the only options I had. Thank you for producing such a quality, sustainable product. ❤️❤️ I'm trying to do my part and Rosy Soil makes it a lot easier to make a better choice. ❤️

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Reviewed by Avis L. P.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Enhanced potting soil

I have purchased this soil several times and used it “as is” and recently I mixed it half and half with some greenhouse purchased soil. I seem to like it better as it holds moisture better. The Rosy Soil has been enhancing and promoting the growth of my plants. I plan on using it for all of my plants once I get to the larger ones. It’s a great product for all of my species so far. That is African violets to ferns to figs. It’s great!

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

My plants are thriving after using Rosy!

Winter in NJ is always rough on my house plants. I added a layer of Rosy Soil to all and they look better than ever!

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