Air
Intro
Plants constantly interact with the air around them. CO₂, gas exchange, air movement and air quality can all influence photosynthesis, transpiration and overall plant health.
Understanding the air around your plants helps you create an environment where they can exchange gases and grow efficiently.
CO₂
CO₂ (carbon dioxide) is one of the raw materials plants use for photosynthesis. Plants take it from the air and use it to build the carbohydrates that fuel growth.
Normal atmospheric CO₂ is around 420 ppm, which is enough for plants to grow well. Higher CO₂ can increase growth when light, nutrients, water and temperature are also sufficient.
Air circulation
Air circulation keeps the air around the plant moving instead of becoming stagnant. Gentle airflow helps distribute temperature and humidity, supports gas exchange around the leaves and helps surfaces dry faster.
You don't need to blast the plant with a fan — steady, gentle movement is usually enough.
Gas exchange
Gas exchange is how plants exchange gases with the surrounding air, mainly through tiny openings called stomata. CO₂ enters the leaf for photosynthesis, while oxygen and water vapor can leave.
Good airflow around the leaves helps maintain this exchange by preventing the air directly around the leaf from becoming stagnant.
Air quality
Air quality describes what else is present in the air besides the gases plants naturally use. Dust, smoke, chemical fumes and airborne particles can settle on leaves or interfere with a clean growing environment.
For indoor growing, clean air and good ventilation help keep plants healthier and reduce the buildup of unwanted particles and pollutants.