The stem is responsible for holding up the plant straight and making sure that it goes towards the direction of the light. There are a lot of people who love gardening who would make sure that their plants get enough light, water, and healthy soil. Without these things, it will be impossible for the plants to survive.
Those who live in places wherein the sun does not shine that much would need to make the plants grow indoors. There are a lot of grow lights that are available now that would give plants what they need. Take note that some grow lights may produce too much heat and this will not be good for most plants.