Sphagnum moss is one of the most useful natural growing materials used in horticulture. It is widely used in orchid growing, terrariums, hanging baskets and specialist potting mixes because of its outstanding ability to retain moisture while still allowing air to reach plant roots.
Available in Australia as both loose moss and compressed blocks, sphagnum moss is sourced from Tasmania as well as New Zealand, where it is harvested under managed conditions.
Quick Facts
- Common Name: Sphagnum Moss
- Botanical Name: Sphagnum species
- Available As: Loose moss or compressed blocks
- Main Uses: Orchids, terrariums, hanging baskets, propagation and carnivorous plants
- Water Retention: Excellent
- Aeration: Excellent
- Origin: Tasmania and New Zealand
- Reusable: Yes, in many applications
What is Sphagnum Moss?
Sphagnum moss is an organic, highly moisture-retentive material that has become an essential component in many horticultural applications. It is valued for its ability to absorb and hold large amounts of water while maintaining excellent air spaces around plant roots.
The species found naturally in Australia is Sphagnum cristatum, which grows in alpine regions along the Victorian and New South Wales border as well as throughout Tasmania. Much of the sphagnum moss available commercially is imported from New Zealand and includes species such as Sphagnum subnitens.
In addition to its practical uses, sphagnum moss is also valued for its attractive natural appearance. It is commonly used as a decorative top dressing for pots and hanging baskets and as a backing material when mounting orchids, elkhorn ferns and staghorn ferns.
Uses for Sphagnum Moss
Sphagnum moss is used wherever moisture retention and good root aeration are important. Common uses include:
- Growing orchids
- Mounting elkhorn and staghorn ferns
- Terrariums
- Hanging baskets
- Growing carnivorous plants
- Plant propagation, including air layering
- Specialist fern potting mixes
- Seed germination and rooting cuttings
How to Use Sphagnum Moss
Loose sphagnum moss is usually supplied slightly moist and can be used straight from the bag.
Compressed blocks should be soaked in water until they fully expand before gently squeezing out excess moisture.
When using sphagnum moss around plant roots, avoid packing it too tightly. The fibres should remain loose enough to allow air circulation while still holding adequate moisture.
Sphagnum Moss vs Peat Moss
Although they come from the same group of plants, sphagnum moss and peat moss are quite different.
Sphagnum moss consists of the long fibrous strands harvested from the surface of the plant. It provides excellent moisture retention and aeration, making it ideal for orchids, terrariums and propagation.
Peat moss is partially decomposed sphagnum that has accumulated over thousands of years beneath living moss. It is used primarily as a soil conditioner and moisture-retaining amendment in garden beds and potting mixes.
Sphagnum Moss vs Coir Peat
Coir peat is made from processed coconut husks and is becoming an increasingly popular alternative to peat-based products.
While both materials retain moisture well, sphagnum moss generally provides better aeration and is preferred for orchids, mounted plants and terrariums. Coir peat is commonly used in seed raising mixes, vegetable gardens and general potting media where a sustainable, renewable growing medium is desired.
Where To Buy
507 Belgrave-Gembook Rd, Cockato, Victoria, 3781
Ferns and Tree Ferns, Tasmanian Tree Ferns. Ferns and Bromeliads on Tree Fern Backing Boards, Bromeliads, Kangaroo Paw, Sphagnum Moss, Hypoestes Phyllostachya, Phalaenopsis.
www.ferngardens.com.au
Sphagnum Moss vs Peat Moss
| Sphagnum Moss | Peat Moss |
|---|---|
| Long fibres | Fine decomposed material |
| Excellent aeration | Less air movement |
| Reusable | Generally not reusable |
| Used for orchids and terrariums | Used as a soil amendment |
| Renewable when harvested sustainably | Forms very slowly |
Sphagnum Moss vs Coir Peat
| Sphagnum Moss | Coir Peat |
|---|---|
| Natural moss | Coconut husk fibre |
| Higher moisture retention | Excellent moisture retention |
| Ideal for orchids | Better for seed raising and potting mixes |
| Premium growing medium | Sustainable alternative to peat |
Coir peat is becoming increasingly popular because it is a renewable by-product of the coconut industry.
Frequently Asked Questions
Is sphagnum moss the same as peat moss?
No. Sphagnum moss is the fibrous moss itself, while peat moss is decomposed sphagnum that forms over long periods in peat bogs.
Can sphagnum moss be reused?
Yes. In many situations, particularly with orchids and terrariums, sphagnum moss can be cleaned and reused until it begins to break down.
Is sphagnum moss good for orchids?
Yes. It provides an excellent balance of moisture retention and air circulation, making it one of the most popular growing media for many orchid species.
Is sphagnum moss suitable for terrariums?
Absolutely. Its ability to retain moisture while helping regulate humidity makes it ideal for terrariums and other enclosed growing environments.