The calendar is the wrong tool
Almost every houseplant that dies indoors dies wet. Not because its owner was careless, but because a weekly routine ignores everything that actually drives water use: light level, pot material, soil mix, room temperature and the season. A pothos in a bright July window may drink twice a week. The same pothos in a north-facing hallway in January may go three weeks and still be damp. A fixed schedule cannot tell the difference. Your finger can.
Check the soil at depth, not the surface
The top half inch of any potting mix dries within a day and tells you almost nothing. Push a finger two knuckles deep, or slide a wooden chopstick to the middle of the root ball and pull it out. Dark, cool and clinging means wait. Dry, pale and clean means water. For pots too large or too dense to probe, a cheap soil moisture meter used at mid-depth is genuinely useful — just move it around the pot, because readings vary between the wet core and the dry edge. Aroids, ferns and calatheas want you to water when the top third is dry; succulents, cacti and snake plants want the mix bone dry all the way through.
Weight is the most reliable signal
Lift the pot right after a thorough watering and again a week later. The difference is dramatic, and after a few cycles you will judge moisture by heft alone in two seconds. This is how commercial growers work, and it is far more accurate than any meter. Terracotta helps here too: unglazed clay wicks moisture outward and darkens visibly when wet, so the pot itself becomes a gauge. Plastic and glazed ceramic hold water much longer, which is why the same plant in the same room needs a different rhythm depending on what it is potted in.
When you water, water completely
Small, cautious splashes wet the top and leave the bottom third of the root ball permanently dry, and salts accumulate where water never flushes. Take the plant to the sink, pour slowly until water runs freely from the drainage holes, wait a minute, then pour again. Let it drain for ten minutes and tip out anything sitting in the saucer. If the mix has gone hydrophobic and water sheets straight through without soaking in, bottom-water instead: stand the pot in two inches of water for twenty minutes until the surface darkens, then drain.
Read the leaves, but read them correctly
Drooping is ambiguous — it happens at both extremes. Thirsty leaves are limp, lighter, sometimes crisp at the edges, and they recover within hours of watering. Overwatered leaves are soft, yellowing from the bottom of the plant upward, and often accompanied by a sour smell from the soil and dark, mushy roots. Brown crispy tips usually mean dry air or salt build-up rather than underwatering. When you are unsure which direction the problem runs, unpot the plant and look at the roots: firm and pale is healthy, brown and slimy is rot.
Adjust for the season, not the date
Light drives water use, so the shortest weeks of the year need the longest gaps. From November through February most tropicals slow down and need roughly half their summer water; heated rooms make foliage look thirsty while the root ball stays soaked. In spring, as day length climbs and new growth appears, increase gradually rather than jumping back to a summer rhythm. Keep plants off cold windowsills at night — chilled wet soil is the classic winter rot recipe. One habit beats every rule here: check before you pour, every single time.