Cactus do not require too much care and do well both indoors and outdoors |
Many people grow cacti because they are easy to care for. If
you forget to water them, you do not have to fret because your cactus does not need
a lot of watering and feeding needs. However, fungus growth can happen with
over watering and stem rot could result. Once you encounter stem rot, you might
have to cut away at the brown parts of the stem and include some greenish areas
as part of the cleaning process just to ensure the infection is not spreading
further.
When your cactus is suffering from over watering, you will
notice brown spots gathering on its stem. You should then un-pot your cactus
and ensure that the roots are white and do not show any brown or black color.
If there are brown and black roots, cut them away and leave the cactus to dry
completely out of its pot. When using a knife, ensure that it is clean and
sterilized as cacti are sensitive and rot can happen with unclean cuts. When
handling stem rot or even grafting rot, you must cut away the rot as well as
part of the green which may contain the infection. If you only cut the brown
section of the body part that shows the rot and not the greenish section above
the brown stem which could show some signs of infection, you could still be
dealing with rot and all this can spread to the cactus’ cortex very quickly.
When you have treated your cactus and allowed it to dry out,
repot the plant and watch the watering. Only water the cactus sparingly about
1-2 inches on the top soil and avoid leaving it in a saucer of water. Your
cactus will thrive in the driest condition and needs only some water every
10-14 days.
So, what are the common causes of rot in a cactus? Some of
these may include the following:
Fungus and Rot:
Exposure of the weakened plant stem
can sometimes lead to infection and rot. Most often, fungi can attack an
exposed and weakened part of the cactus and they spread rapidly through spore
generation.
Insects and Invertebrates:
The cactus plant attracts many
insects and rodents including birds which enjoy eating these plants. This problem
is inherent usually with cacti planted outdoors. These critters do not feast on
the whole plant but could leave open wounds and waste products about exposing
your plant to plant pathogens. In some cases, the rodents are known to
contently munch at your cactus until it is finished. Insects which feast on
cacti include mealybugs, worms, caterpillars, red spider mite, aphids and
nematodes.
Do not transport multiple cacti together as they could scar each other |
Excessive moisture:
Cacti are succulents and generally
store water in their tissue. In long dry conditions, they would use the water
to help them survive. When we keep them over-watered, they have difficulty
getting rid of the excess water in their stems. These cacti then swell up a lot
with constant watering and there will come a time when the cactus will split
open in one or more places. While a cactus may recover from this, it exposes
the plant to rot and the roots begin to show signs of the rot. Sometimes, the
whole plant will turn to mush.
Rapid Growth caused by
Fertilizer:
Although indoor cacti may require
some fertilization to encourage healthy growth and flowering, too much
fertilizer can result in bloated plants and quick growth causing the stem to elongate
and get distorted. Generally, cacti which are growing outdoors do not require
any fertilizer as they are content with the outdoor sun and rain. Rain water
for instance will provide enough nutrients for the soil. Instead of
fertilizing, it is sometimes better to replace worn out soil with fresh soil to
promote better root growth and replenish the much needed nutrients.
Physical Damage:
Cactus growers need to be careful
when moving their plants about as sometimes they could damage the plant causing
a scrape wound, a poke or in severe situations, a smash that could happen
leading to a tear in the stem. Avoid carrying multiple potted cacti about as
sometimes the spines from one cactus could puncture or scratch the other cactus
next to it causing a brown scar to develop after a few days. This scar will
remain with the plant for life and is sometimes mistaken as a sign of a disease
or that a pest is near.
Sun Burn:
If you move your cactus plant from
a shady location to direct sunlight, you could cause the plant to suffer from
sun burn. Too much sun will cause the outer cells to die providing an impetus
for fungi attack. A light burn will show up as a whitish discoloring on the
exposed areas while more severe burns will take the color of a hard brown scar
along the plant. If your cactus plant suffers at the whitish discoloring stage,
you can undo the damage by getting it shade but if the plant bears a hard brown
scar, the damage is permanent. Generally, a cactus which has been sitting under
shade for a long time does not do too well under the sun and so, exposure to
the sun should be a gradual affair.