The frequency with which you bottom water plants will depend on a few factors, including the type of plant, the size of the pot, the soil mix, and the climate. In general, most plants need to be watered from the bottom once a week. However, in hot, dry climates, plants may need to be watered more frequently. Conversely, in cooler, wetter climates, plants may need to be watered less often. The best way to determine how often to bottom water your plants is to check the soil mix before watering. If the top layer of soil is dry, it's time to water. If the soil is still moist, wait a few days and check again. Over-watering can be just as damaging to plants as under-watering, so it's important to only water when the plants need it. Bottom watering is a simple and effective way to water your plants. It allows the water to saturate the roots and avoid evaporation. It's also less likely to promote fungal growth than top watering. To bottom water, simply place your plants in a sink or tub and let the water run slowly until it begins to drip out the bottom of the pot.