1. Growth that is slower than normal - As days lengthen and warmer weather returns, all plants inside and out should begin to flush with new growth. If you have some plants that aren't, or if the growth seems slower than normal, it may be time for a larger container.

2. Leaves are off-color - If the leaves should be a rich, deep green (or a rich any other color), but look sort of sickly and yellow and you can't find signs of other issues, the plant may not be able to take nutrients up properly and will benefit from repotting in fresh soil.

3. Always seems dry - The rule of thumb for watering most houseplants is to water as the plant dries out. However, if you are watering and the plant always seems thirsty, like it isn't taking up water properly or if you notice water just running through the roots and not being absorbed by the soil, that's another sign that your plant needs to stretch its feet.