When To Re-pot Your Houseplant
Most houseplants benefit from being re-potted every couple of years but
different types and different growing conditions can affect this greatly.
Another consideration is available space! If you re-pot a houseplant it
will grow bigger so if you have no spare space don't re-pot it.
A houseplant will benefit from re-potting if the roots are forcing
their way through the bottom of their pot. Another way to check is to
take them out of their pot (tricky if the plant is big) and examine the
root ball. If almost none of the soil is visible and you are looking at a mass of
roots then it's probably time to re-pot.
One word of advice, if a houseplant is unhealthy don't re-pot it in the
hope it will recover. Re-potting an unhealthy plant may shock it and end
any hopes of recovery
How to Re-pot Your Houseplant
The best time to re-pot a houseplant is in early to mid Spring, March or
April are normally the best months.