You should water ginger plants frequency based on how fast your soil dries out. Most plants need water every 2-3 days during active summer growth. Hotter weather and smaller pots need more frequent drinks while cool temps and large containers hold moisture longer.
My ginger watering schedule changes with the seasons and weather patterns. In summer heat, I water my containers every other day. Sometimes I water daily during bad heat waves. Spring and fall bring cooler temps that let me stretch watering to every 3-4 days.
I use the finger test to check if my ginger needs water before I grab the hose. You stick your finger 2 inches into the soil and feel for moisture. Dry soil means time to water but damp soil says wait another day.
The ginger moisture requirements sit in the middle between wet and dry. Ginger roots hate waterlogged soil but also hate bone-dry conditions. You want the soil to feel like a wrung-out sponge that's moist but not dripping.
When you think about how much water for ginger, consider your container size and drainage. A 12-inch pot might need about 2 cups of water per session while larger containers take more. Water until you see it drain out the bottom holes and then stop.
I tested different watering amounts in my first season to find the sweet spot. Too little and the leaves went limp by afternoon. Too much and I saw yellow leaves within a week. The finger test helped me dial in the right balance.
Root rot kills more ginger plants than underwatering ever does. The rhizomes sit in the soil and soak up whatever moisture surrounds them. Standing water cuts off air to the roots and lets fungus move in fast.
Good drainage saves your ginger from most watering mistakes you might make. Use pots with big drain holes and add perlite or sand to your soil mix. I put a layer of gravel in the bottom of my pots to keep the holes from clogging up.
Cut back on water when you see leaves start to yellow in fall. This color change signals that your plant is going dormant and needs less moisture. Keep giving small sips to stop the soil from going bone dry but don't soak it like you did in summer.
Indoor ginger needs less water than outdoor plants since it loses less to wind and sun. You should check your house plants every 3-4 days even in winter. The steady indoor temps mean the soil dries at a slow and even rate.
Morning watering works better than evening for most ginger setups. Your plant can drink up what it needs during the day when it grows most. Water left on leaves overnight can lead to fungus problems that spread to the rhizomes below.
Read the full article: Growing Ginger: A Complete Step-by-Step Plan