CO₂ is a gas in the air that plants need to grow.
Plants pull CO₂ in through tiny openings in their leaves (Stomata). They use it to make sugars, and those sugars become leaves, roots, and stems. No CO₂ means no growth.
There is already plenty of CO₂ in normal air, about 420 parts per million (ppm) outdoors and often more indoors. Because of that, most houseplants never need extra CO₂.
What matters more than CO₂:
- Enough light
- Healthy roots with oxygen
- Some air movement around the leaves
Simple takeaway: CO₂ is a basic building block for plants, but for indoor plants, light and root health matter much more than trying to add more CO₂.
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