Hello, human caretaker. It is I, your Pothos plant. From my stationary vantage point, I observe your concern. You provide water and place me in what you believe is an ideal spot, yet my new leaves are few and far between. My growth has stalled. Please, allow me to communicate the most common reasons from my perspective. Listen closely, and we can work together.
You often place me in a dark corner because you've heard I "thrive in low light." This is a half-truth. I am tolerant of lower light, but I do not thrive in it. Light is my food, the energy source that powers my growth. In deep shade, I am in a state of survival, not expansion. My leaves become smaller, the space between them (the internodes) stretches out as I desperately reach for any photon, and my vibrant variegation may fade to solid green as I conserve energy. Conversely, if you place me in the harsh, direct glare of the sun, I will get a sunburn. My leaves will scorch, turn yellow or brown, and crisp. I need the perfect buffet of bright, indirect light to photosynthesize efficiently and produce lush new growth for you.
Down in the dark of my pot, a critical drama is unfolding. My root system is my foundation. If I have been in the same container for too long, my roots become a tangled, congested mass with no room to expand and uptake new nutrients and water. I am effectively pot-bound, strangled by my own success. Alternatively, the opposite may be true. If your care involves excessive kindness with water, my roots are drowning. Soggy, oxygen-deprived soil causes my roots to rot, turning them into a mushy, brown mess that cannot function. Without healthy roots, I cannot drink, eat, or support any new growth above the soil. I am simply fighting to keep my existing leaves alive.
The soil in my pot is not an infinite buffet. The initial nutrients present in the fresh potting mix are eventually depleted by my growth and flushed out by watering. If you never provide supplemental nourishment, I am running on empty. I cannot manufacture the crucial building blocks like nitrogen, phosphorus, and potassium from thin air. A lack of nitrogen, in particular, leaves me unable to produce the chlorophyll and new plant cells required to create a fresh, green leaf. My older leaves may even turn yellow as I cannibalize their nutrients in a last-ditch effort to sustain myself.
I am a tropical being, evolved for a warm, stable, and humid environment. A constant draft from an air conditioner or a leaky window places me under cold stress, causing my growth to halt as I conserve energy. Similarly, blasts of dry, hot air from a heating vent desiccate my leaves, sapping moisture faster than my roots can replace it. Low humidity causes stress that stifles my growth potential. While I am adaptable, I truly desire the consistent warmth and moist air of my jungle home to put on my best show of growth for you.