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 80 reviews
Regular price$19.99

☑ 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 80 reviews
  • 5 Stars
    75 Reviews
  • 4 Stars
    5 Reviews
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
80 Reviews
Reviewed by Linda W.
I recommend this product
Rated 5 out of 5
Review posted

My Calatheas Love Rosy Soil

I was unsure about spending so much for soil. But after seeing how my calatheas are thriving after repotting in Rosy Soil, I will be slowly transitioning all of my houseplants as they need repotting. Rosy Soil is an investment in the health of my houseplants. Highly recommend.

Was this helpful?
Reviewed by J. G.
I recommend this product
Rated 5 out of 5
Review posted

Rich indoor potting soil

This soil feels like the Cadillac of potting mediums: rich and soft, feels good on the hands. I'm happy about the environmental attention paid by the Rosy Soil company, very important for me. My indoor plants seem to be thriving in it.

Was this helpful?
Reviewed by Christine
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Amazing customer service

There was a rip in one of the potting soil bags and soil had seeped out, since the bag was partially empty. I contacted customer service, and they sent me a new bag promptly. Amazing customer service, excited to use this potted mix once I get new pots.

Was this helpful?
Reviewed by Emily
Verified Buyer
I recommend this product
Rated 4 out of 5
Review posted

So Far So Good!

Time will tell, but so far after a few weeks of being repotted with Rosy Soil, my plants seem to be doing well. When planting, the soil has a dense but lighter-feeling consistency. Customer Service was great - my order came in slightly damaged and Chad was quick to remedy the issue. I would recommend this potting soil.

Was this helpful?
Reviewed by Allisa K.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

All in one soil

This soil is great and has everything your houseplant wants and needs. My favorite part is the resealable bag makes it super convenient

Was this helpful?