This is one of those things about gardening that can be really confusing for beginners: how do you know which pot size is the right size for your plant?
Here are some basic guidelines!
Choose a pot that's comparable to the size of the plant
Many plants enjoy having room to spread out, but too much or too little room can cause problems! Pots that are too big can cause a plant to sit in water for too long or cause nutrient burn from the large amount of nutrients the soil ends up holding. A pot that's too small can cause a plant to become rootbound, leaving very little soil available to hold on to water.
Don't make a drastic jump in sizes
If you have a plant in a four inch pot, it's best to move up to the next size - a six inch pot! Don't go crazy and double the pot size, as it will take a long time for the plant to fill the pot and increase your chances of over watering it.
Choose deeper pots for plants with large roots, and shallower ones for plants with small roots
Large houseplants with a ton of foliage tend to develop deeper, larger root systems and can handle being put in a pot as tall as it is wide. Succulents and cacti do well in shallower pots.
If all else fails, check the roots
If you're really unsure about which direction to go, gently remove the plant from its current pot and check the roots. Are they filling out the pot? If so, go up a size. If you see an equal amount of soil and roots, chances are the plant is fine in the current pot size. If you see loads of soil and very little roots, you may want to go down a size if the plant or its roots look unhealthy.
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