Your plant does not know what day of the week it is. Water when the species and potting mix need it, not because exactly seven days have passed.
Check moisture first
Feel a few inches into the mix or learn the pot’s weight when wet and dry. Some species prefer the top layer to dry; others need more consistent moisture.
Light and season change the interval
More light, warmth, and active growth generally increase water use. In winter many plants grow more slowly and take longer to dry.
The container changes drying speed
Small pots, porous clay, and airy mixes dry faster. Large containers or pots without drainage can stay wet for too long.
Water thoroughly when it is time
For plants that prefer this method, wet the root zone evenly and let excess drain. Empty saucers so roots do not sit in standing water.
Drooping does not always mean thirst
Overwatering, root damage, cold, and drought can produce similar symptoms. Check the mix before responding with more water.
Learn each plant’s rhythm by observing how long it takes to move from freshly watered to the moisture level where that species actually needs another drink.
Sources
- University of Minnesota Extension — Watering houseplants — Houseplant watering based on plant type, potting mix, season, light, and root-zone moisture.