The single most common indoor plant killer in Australian apartments is, by a long way, overwatering. Underwatering is more obvious. Drooping leaves, dry soil, sad-looking plant. People react. Overwatering is sneaky because the early symptoms can look identical to a thirsty plant, and the natural reaction is to water more, which makes everything worse.

The trick is learning to distinguish between the two states because the response is opposite.

Underwatering signs: dry soil that pulls away from the edges of the pot, leaves drooping but still firm, lighter pot weight, occasional crispy leaf edges that develop slowly. The plant looks tired but the soil situation tells the story.

Overwatering signs: soil that stays consistently wet, leaves yellowing from the bottom up, leaves that feel mushy or soft rather than firm, dark spots on stems near the soil line, the early stages of fungus gnats appearing around the plant. The soil situation again tells the story but in the opposite direction.

The trap is that an overwatered plant will eventually droop too, because its roots have rotted and can no longer take up water. At that stage the plant looks thirsty even though the soil is wet. People water more. The plant dies faster.

The simple test that prevents most of this: stick your finger an inch into the soil. If it comes out with damp soil clinging to it, don’t water. If it comes out dry and clean, water. This single habit, applied consistently, would save the lives of more apartment plants than any other piece of advice.

Drainage matters more than people understand. A pot without a drainage hole is a slow death sentence for most plants. If you bought a beautiful ceramic pot without holes, use it as a cachepot around a plastic nursery pot that has drainage. Don’t plant directly into anything that can’t drain.

The seasonal pattern matters too. Most indoor plants need significantly less water in winter than summer because their growth slows. The same watering schedule that worked in January will overwater the same plant in July. Adjust through the year.

Specific cases: succulents and cacti almost always die from overwatering when they die indoors. Fiddle leaf figs hate inconsistent watering and respond by dropping leaves. Pothos and philodendrons are forgiving in both directions and recover from minor watering mistakes. Calatheas and similar prayer plants are difficult because they want consistent moisture without sogginess, which is a fine line.

The best single piece of advice for new indoor plant keepers in 2026: when in doubt, don’t water. The plant that’s been a few days too dry will recover. The plant that’s been a few weeks too wet often won’t.