Why substrate porosity matters more than brand
Most houseplants die from overwatering—which is actually root suffocation caused by dense, water-logged peat moss. Healthy root systems require oxygen exchange around the rhizosphere.
An aerated, "chunky" mix incorporating pine bark, pumice, and coarse perlite prevents fine soil particles from compacting when watered, allowing roots to breathe and branch aggressively.
- Always pick pots with at least one drainage hole.
- Never compress the potting mix with your fingers when repotting.
- Use coarse orchid bark for tropical climbing epiphytes.
Frequently Asked Questions
How many liters of soil in a 20 cm (8-inch) pot?
A standard 20 cm cylindrical pot with a 20 cm height holds approximately 6.3 Liters (1.66 Gallons) of potting soil.
Can I reuse old potting soil?
Old soil can be refreshed if pasteurized, but it often lacks microbial activity and has broken down into fine dust. For valuable exotic tropicals, a fresh chunky substrate mix is strongly recommended.