The Humidity Factor: Less Thirst in the Air
When it rains, the humidity outside skyrockets, and that moisture makes its way indoors. For your plants, this is like being in a spa. Plants lose water through tiny pores in their leaves in a process called transpiration. When the air is already saturated
with moisture, this process slows down significantly. As a result, your plant holds onto its water for longer, and the soil stays moist for an extended period. Giving it the same amount of water as you would on a dry, sunny day can quickly lead to soggy soil and unhappy roots.
Less Light, Slower Growth
Rainy days are almost always cloudy days. This reduction in sunlight has a direct impact on your plant's metabolism. Photosynthesis—the process where plants use light to create food—slows down. Think of it as your plant's activity level dropping; it’s not as busy, so it doesn’t need as much fuel or water. Plants that are growing slower use less water from the soil. Watering on your usual schedule without accounting for these gloomy, low-light conditions is one of the fastest routes to overwatering.
The Dangers of a Rainy Day Overreaction
The most common reason for houseplant demise is overwatering. When soil remains waterlogged, air pockets are eliminated, and roots can no longer breathe. This leads to root rot, a fungal condition that causes roots to turn brown and mushy, making them unable to absorb any water or nutrients at all. Paradoxically, a plant suffering from root rot will often look wilted and thirsty, which can trick well-meaning owners into watering it even more, accelerating its decline. During the monsoon or extended rainy periods, the risk of root rot is especially high because the soil takes much longer to dry out.
The Golden Rule: Check the Soil First
Instead of watering on a rigid calendar schedule, get into the habit of checking your plants first. The most reliable method is the finger test: stick your finger about an inch or two into the soil. If it feels dry at that depth, it’s time to water. If you feel any moisture, hold off for another day or two and check again. For larger pots, a wooden skewer or chopstick works well; insert it deep into the pot and pull it out. If it comes out clean and dry, it's time for a drink. If it has moist soil clinging to it, wait. Another simple trick is to feel the weight of the pot. A pot with dry soil will feel significantly lighter than one with moist soil.
How to Tell Thirst from Drowning
Both overwatered and underwatered plants can look wilted, so it can be confusing. The key difference lies in the leaves and the soil. An underwatered plant will have crispy, dry, brown leaf edges and the soil will feel bone-dry and may pull away from the sides of the pot. An overwatered plant, however, will have soft, limp leaves that may be yellowing, and the soil will be damp or even soggy. The stem base might also feel mushy, and you might notice a musty smell from the soil, which is a sign of root rot setting in.
