Soil Ninja Fine Bark | Compost Additive 2.5L

Soil Ninja Fine Bark is a natural, peat-free soil amendment that helps create the chunky, airy potting mixes loved by Monstera, Philodendron and other tropical houseplants. By improving drainage, aeration and structure, these small bark pieces help prevent compost from becoming too dense, giving plant roots room to breathe and grow.

Often referred to as orchid bark, this versatile ingredient is especially popular with houseplant enthusiasts who prefer to make their own potting mixes. The fine grade is ideal for smaller pots and for blending evenly with compost, perlite and other growing media.

Why add fine bark to houseplant compost?

• Better root aeration: Creates air pockets throughout the compost, allowing oxygen to reach the roots.
• Improved drainage: Helps excess water move through the growing medium, reducing the risk of prolonged waterlogging.
• Prevents compaction: Adds lasting structure to potting mixes, helping keep them loose and open.
• Ideal for custom soil mixes: Combine with compost, perlite, pumice or other ingredients to create a growing medium suited to your plants.
• Fine-grade texture: Smaller pieces are particularly useful for young plants, smaller pots and evenly blended substrates.
• Responsibly sourced: Produced from bark sourced from 100% FSC-certified, responsibly managed forests.

Which houseplants benefit from fine bark?

Fine bark is particularly useful for aroids, a group of tropical plants that often prefer an open, well-aerated growing medium rather than dense, moisture-heavy compost.

• Monstera: Helps recreate the loose, chunky growing conditions preferred by Swiss Cheese Plants, including Monstera deliciosa and adansonii.
• Philodendron: Excellent for creating airy potting mixes for climbing, trailing and self-heading varieties.
• Pothos (Epipremnum): Improves the structure and drainage of everyday houseplant compost.
• Anthurium: A useful addition to specialist mixes for species that appreciate plenty of oxygen around their roots.
• Hoya: Helps create the open, free-draining substrate preferred by many wax plants.
• Other tropical houseplants: Including Rhaphidophora and Scindapsus, which benefit from a balance of moisture retention and aeration.

How to use Soil Ninja Fine Bark

Mix the bark evenly into your chosen houseplant compost before repotting. For Monstera and Philodendron, try combining it with a suitable compost base, perlite and a little worm castings to create a nutritious, well-aerated growing medium.

The amount of bark needed will depend on your plant and the other ingredients in your mix. Plants with thicker roots generally appreciate a chunkier substrate, while smaller or younger plants may benefit from a finer, more evenly textured blend.

Fine bark or coarse bark? Fine bark is ideal for smaller pots and custom compost mixes where you want the bark distributed evenly. Coarse bark creates larger air spaces and is better suited to substantial plants with thick root systems.

Product details

• Brand: Soil Ninja
• Product: Fine Bark
• Grade: Fine
• Uses: Houseplant potting mixes, drainage, aeration and soil structure
• Sourcing: 100% FSC-certified forests
• Properties: Natural, peat-free and biodegradable
• Bag size: 2.5 litres

Please note: As a natural product, the appearance and size of individual bark pieces may vary between batches.

Creating your own houseplant compost? Explore our Soil Ninja collection for specialist growing media and individual soil components.