Houseplants in a controlled production greenhouse are kept in an ideal conditions for rapid growth. Some plants and production flowers are even hybridized for fast growth characteristics.
Nutritional needs of a plant in a production green house are greater than in a typical personal house plant environment where humidity, light, irrigation, and air circulation are not ideal. After being removed from the production greenhouse the plant slows evapotranspiration. Likewise after being brought into a typical household the watering and nutitional requirments decline, the plants growth rate declines and the nutritional needs decline. Plants use most of the carbon that they release from Co2 to create energy but some of the carbon feeds plant growth. Far less plant food comes from the soil.