New aquarium plants melting within days of planting is usually normal "transition melt," not a dying plant. Most aquatic plants are grown out of water at the nursery, and the leaves they grew that way can't survive underwater — so they die back while the plant regrows leaves adapted to being submerged.
Why do new aquarium plants melt after planting?
Nurseries grow most aquatic plants emersed (out of water) because it's faster and cheaper than growing them submerged. Those emersed leaves are built for air, not water, so once planted they can't survive the switch and die off. The stress of transport and a new tank environment speeds this up further. It looks alarming, but it's the plant shedding old growth on its way to producing new, underwater-adapted leaves.
How long does plant melt last?
Typically a few days to a few weeks. New growth should start appearing within that window if the plant is otherwise healthy and the water quality is stable. Slower-growing species can take longer than fast growers like stem plants.
Should I remove melting leaves?
Yes. Trim off leaves as they die back rather than leaving them to decompose in the tank — rotting plant matter adds to the bioload and can cloud the water or spike ammonia. Leave any tissue that's still green and firm.
Normal melt vs. an actual problem
| What you're seeing | Likely cause | Guide |
|---|---|---|
| Some leaves die back, new growth appears within weeks | Normal transition melt | This guide |
| Whole plant turns to mush, rhizome/crown rots | Rot, not melt | Run the plant diagnosis |
| No new growth after several weeks | Light/CO2 limitation stalling recovery | Light or CO2 guide |
| Yellowing on otherwise healthy leaves | Nutrient deficiency | Yellowing leaves guide |
When should I actually worry?
If the whole plant turns to mush rather than shedding individual leaves, or the rhizome/crown (the central growing point, common on plants like anubias and java fern) goes soft and brown, that's rot rather than melt — remove the plant and check for a different cause. The same goes for no new growth at all after several weeks; at that point it's worth checking your light and CO2 rather than waiting it out.
Not sure if what you're seeing is normal melt or something else? Run the 2-minute plant diagnosis to narrow it down.