Watering from the top with room-temperature water is the rule for most plants. When you water, be thorough. Pour on enough water so that some seeps into the saucer or tray below the pot. An hour later, discard any water remaining in the saucer. With practice, you will soon learn just how much water each of your plants need.
Small pots dry out almost daily in winter.
Large pots will dry out every week or ten days, and sandy soils dry out more quickly than other soil types. Plants with many leaves use more water than plants with few. To help keep moisture from evaporating from your plants, use mulch, pebbles or moss.