Perlite
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For full details, please see:
- Care basics – Main hub with links to all houseplant care guides.
- After delivery & first week – Unpacking, first placement, and early recovery.
- Light – How much light houseplants really need indoors.
- Watering – When to water and how to avoid root rot.
- Substrates & roots – Potting mixes and drainage for strong root systems.
- Humidity – When humidity matters and what actually helps.
- Fertilizing – Simple feeding routine without burning roots.
- Problems & pests – Yellow leaves, brown tips, bugs, and fixes that work.
- Semi-hydro – How to run low-maintenance mineral substrates.
Perlite – Lightweight drainage and aeration booster for potting soil
Perlite is a super-light, expanded volcanic glass that opens up dense soil, improves drainage and increases aeration around roots. It is one of the easiest ways to turn heavy compost into a breathable mix for houseplants, aroids, succulents and propagation.
Why perlite belongs in modern potting mixes
- Helps excess water escape: reduces the risk of waterlogged pots and root rot.
- Boosts oxygen at the root zone: keeps structure loose so roots can grow into air gaps, not just solid compost.
- Retains some moisture: holds a thin film of water on each grain while letting the bulk of the mix dry at a sensible pace.
- Clean, inert and pH-neutral: does not decompose or load the soil with extra nutrients.
Best situations for using perlite
Use perlite whenever a mix feels too compact or slow to drain. It is especially useful for aroids, epiphytes, succulents, bonsai and cuttings that need air around the roots and hate sitting in cold, wet soil.
For full background on structuring mixes and repotting technique, see our houseplant substrate overview and repotting guide.
