Root Pruning

Most house plants and Patio plant's roots can grow quite large,
to maintain them in the same pot take the plant out of pot and
shake off some of the loose dirt. I usually use a sharp knife and
start to shave off some of the sides and the bottom of the roots
about an inch off of the bottom and sides.
Place about a inch of semi-moist soil at the bottom of the pot.
Its always a good idea to use seed starter soil because of
the fast drainage. Place the plant back into the pot and fill
the sides up with soil. Repotting plants should never be more
than an inch larger all around than the root ball. Pots that are too
deep can have excessive dryness. After all the soil is packed in,
water well. There are a few plants that most likely cannot have
their roots pruned due to the trunks such as a Ponytail Palm, and Clivias.
Now it's time to reduce the stress of repotting your plant now that you have
pruned the roots it's time to prune some of the branches off. Too
many heavy leaves and branches will be overwhelming to a newly
pruned plant. Cut about an inch to 2 inches off of the tops or some
of branches. For about a week make sure your plant is kept moist to
keep it from going into shock. In general like the outdoor plants, it's
always a good idea to prune all house plants, this makes them grow
thicker, and healthier.