Winter brings shorter days and weaker sunlight, significantly impacting your houseplants' growth and water requirements. Just like trees that shed their leaves and enter a dormant state, many houseplants slow down their growth during winter. This is directly linked to the reduced light availability.  

Photosynthesis and Reduced Water Uptake

Photosynthesis, the process by which plants use light to convert carbon dioxide and water into energy, slows down significantly in winter. This means your plants simply don't need as much water. Overwatering during this period is a common mistake and can lead to root rot and other problems.  

The Illusion of Indoor Light

It's easy to overestimate the amount of light available to your houseplants. Our eyes adjust to lower light levels, but plants experience a significant decrease in light intensity, especially indoors. Even placing a plant a meter away from a window drastically reduces the amount of light it receives.  

Measuring Light with Your Phone

You can use a light meter app on your phone to see the difference in light intensity. For instance, next to the window in my office, I measure 1400 lux. But just 2 meters away, it drops below 200 lux! This demonstrates how quickly light diminishes indoors, even in a well-lit space.

Transpiration: The Water Cycle Slows Down

Transpiration, the process of water movement through a plant, is also affected by light. In low light conditions, transpiration slows down, meaning your plants lose less water and need less frequent watering.  

Signs Your Plant Needs Less Water

• Reduced water absorption from the soil.
• Closed stomata (tiny pores on leaves) to conserve water.  
• Slower or no new growth.

Adjusting Your Watering Routine

• Lift the pot: The most reliable way to check if your plant needs water is to lift the pot. If it feels light, it's time to water. With practice, you'll develop a sense of the weight difference between a dry and wet pot.
• Ensure good drainage: Use pots with drainage holes and well-draining soil to prevent waterlogging and root rot.  

Individual Plant Needs

While these guidelines apply to most houseplants, remember that individual needs can vary. Factors like plant type, pot size, and your home's environment all play a role. Observe your plants closely for signs of thirst (wilting, dry soil) or overwatering (yellowing leaves, soggy soil).

Winter Care for Healthy Plants

By understanding how light and water affect your plants in winter, you can adjust your care routine accordingly. This will ensure they stay healthy and continue to bring you joy throughout the season.