29/06/2026
A quick gardening fact worth knowing: soil volume matters more than pot height
It's one of the most common mistakes new plant owners make. You choose a container because it *looks* right, when what actually matters is happening below the soil line. Roots don't just grow straight down. They spread outward, branching sideways in search of water, oxygen, and nutrients. Give them a tall but narrow pot and they run out of room quickly. Give them width and depth, and they build a healthy, stable root system that supports everything above it.
This is why volume is the number that counts. More soil holds moisture longer and stays evenly damp, which protects roots from constant wet-dry swings. It holds more nutrients before they're used up, and it buffers temperature, since soil in a generous container heats and cools more slowly. That shields roots on a hot balcony or a cold windowsill.
It also explains why plants ask for such different homes. A serious outdoor planter often starts around 180 L of soil, because those root systems genuinely need the space. A windowsill succulent is happy in a small cube. Its roots are shallow, it stores its own water, and too much soil would just stay wet and invite rot.
So before you pick a pot, picture what's happening underground. Match the container to the root system, not to the plant's height above the soil, and most of your watering and "why is it struggling?" questions get a lot easier to answer.