This varies by species, but a general rule is to check the top 2–3cm of soil — if it's dry, it's usually time to water; overwatering is one of the most common causes of houseplant problems.
This varies by species, but a general rule is to check the top 2–3cm of soil — if it's dry, it's usually time to water; overwatering is one of the most common causes of houseplant problems.