A division off my own bathroom-shelf plant sat in a clear glass of rain water on the windowsill for six weeks. I checked it most mornings. The roots hung there, pale and visible through the glass, but not one new leaf opened. The old leaves held their color and went no further. So here is the straight answer on a calathea medallion in water: it can survive for a short while, but it will not thrive long term without soil.
The moment I potted that same division into a moist mix, it pushed out a fresh leaf within two weeks. I noticed the difference fast. Water is a holding stage for your plant. It is not a home. The plant treads water in a glass and then moves the instant it gets real footing for its roots.
The reason comes down to where your plant grew up. The calathea evolved on the floor of warm, moist forest soil in South America. Its roots learned to pull oxygen, nutrients, and a steady grip from a loose, living mix. A glass of plain water gives your plant none of that. The water holds little oxygen at the root, carries no real food, and offers nothing for the roots to anchor into. So your plant runs on what it already has and slowly empties the tank.
You might wonder about growing calathea in water because the trick works for pothos and other easy vining plants. Those plants root in a jar and keep going for months. Your calathea medallion is built on a different plan. It is a foliage plant that feeds hungry, patterned leaves, and those leaves demand more than water can hand you. So the popular hydroponic idea falls apart here within a season, no matter how good your glass looks.
A cutting or a fresh division may hold for a short time in your water glass. You will see roots, and that fools a lot of people into leaving the plant there. Then the slide begins. Your plant weakens, yellows, and stalls. Lower leaves go soft and pale first. New growth stops. By the time you see the leaves curl and crisp at the edges, the plant has been coasting on empty for weeks.
If a calathea left in water shows yellowing lower leaves, no new growth for a month, and roots that look slimy or dark, pot it into soil right away.
This is where your calathea soil needs come in. A good mix does three jobs at once that water simply cannot do for you. It holds moisture without staying soggy, so the roots stay damp but still breathe. It carries the nutrients your leaves use to stay deep green and patterned. And it gives the roots a structure to spread through and lock into, which keeps your whole plant stable and fed. Soil is not a nice extra here. It is the base your plant was made for.
Use water only as a short bridge for your plant, never as the destination. Rooting a division in water for a week or two while it settles is fine. The clear glass even lets you watch the roots and check that they look white and firm rather than brown. Just treat your glass as a countdown, not a setup, and you will not lose the plant.
Move your plant into a moist, well-draining mix as soon as you see healthy roots. A blend of potting soil with some perlite and coco coir or orchid bark works well for you. It drains fast but stays damp, which is exactly the balance your plant wants. Keep it out of direct sun, water with filtered or rain water, and your plant rewards you with steady new leaves. Leave it in the glass and you get a slow, quiet decline instead.
Read the full article: Calathea Medallion Care: Full Guide
