Her Ugliness wrote:From my experience most plants are rather killed by over-watering than the other way around. Changing soil is not really necessary unless you need to repot the plant into a bigger pot. You just have to add fertilizer from time to time.
Changing soil is pertinent for plants that intake nutrients fast, actually. It really depends on what type of plants you have. Sometimes adding fertilizer instead of just changing the soil can hurt a plant rather than help it.
Then again, using the right fertilizer might be an issue if you end up killing plants off with it. I have a friend who has that issue but mainly she just doesn't take very good care of plants so she kind of gave up lol (to be fair though, she lives in a very cold climate and hasn't tried growing plants that do well in the cold i think)