The basic non-glazed pots are porous – they draw
moisture from the soil which tends to mean more
frequent watering, making them a good choice for
cacti or succulents and ferns or orchids. A drawback
is these pots also absorb minerals and salts which can
cause a white crusty build-up on the exterior. The
glazed pots are waterproof and hold moisture better.
Clay retains heat for long periods of time and the
soil can become quite hot in sunny locations. While
this is great for some species, other plants won’t do
well in this situation. Terracotta pots can crack and
break easily, especially if they are exposed to freez-
ing conditions. For the same reason, take extra care
when placing the pots onto a hard surface (tiled
floors, concrete balconies) and when re-potting.
Metal
Metal planters are extremely durable and can
be used in a traditional or contemporary style. Most
metal will age beautifully in color, or with an aged
patina. However, there is little insulation from the
elements and metal plant pots can get very hot unless
they have a plastic or clay liner. One of the best ways
to use a metal container is as a decorative container
that holds a less attractive plastic container inside.
Depending on the exact material used, plant pots
made out of metal can be very heavy – cast iron in
particular. For indoor use, consider wheeled planters
or a lightweight material such as stainless steel. And
although the material is water proof, many metals
will rust over time. To guard against this, use alumin-
ium planters that are both lightweight and rust proof.
Wood
A wooden planter can add a wealth of character
to any home. Available in a wide choice of timbers,
colors and designs, they are an attractive way to fea-
ture houseplants. Most indoor planters come ready
painted and pressure treated, so there shouldn’t be
much maintenance unless they are used in an out-
door environment like a patio. Untreated wooden
planters will soon lose their visual appeal and can be
susceptible to insect attack too – not something you
want in your home.
Wood is a robust natural material that will help
insulate plant roots from the sun/heat and cold. How-
ever, make sure the container bottom doesn’t get too
wet or it can start to rot. To protect indoor flooring,
it’s best to lift the wooden planter a few inches off
the floor, or use a portable trolley with castors, which
is also useful for changing the position of heavy
houseplants. GG
Mike James is an independent writer that specializes in house-
plants. He wrote this piece in conjunction with Totally Plants
Indoor-Plants.co.uk.
36
www.GardenandGreenhouse.net
August 2017