was given a peace lily about a month ago. However, some of the new
leaves are yellow all over. I've left it in the garage (no sunlight)
and I've just noticed that there is a green mould or something on
it. Also, when do you know when to repot a plant? Does this plant
need anything other than water in terms of food?
lilies are hardy indoor house plants, also known as spathiphyllum.
The leaves of your plant turning yellow indicate insufficient watering,
lack of fertiliser, poor light and it may need repotting. Bring
your plant out of the dark into a well lit position away from direct
sunlight. Good light, regular watering and feeding should see it
perk up. Now is a good time to repot it.
Aphids can also cause
leaves to yellow. Aphids are tiny green insects and are likely to
be on the underside of the leaf. A good indoor houseplant spray
such as Yates Confidor will get rid of them. It is likely you will
need to spray the plant several times.
Peace lilies require
good light but not direct sunlight. Water regularly in winter
2-3 times a week, in summer possibly 5 times, depending upon how
hot the room gets.
How frequently the plant
is repotted will depend upon the size of the plant, the size of
the existing pot, and how long it has been in the pot. As a general
rule, repot every year to eighteen months. The bigger the pot, the
bigger the plant will grow.
To repot, use a pot one
size bigger than the existing pot. Half fill it with a quality potting
mix (do not use garden soil or compost as this compacts down, starving
the plant of food, water and oxygen). Tip the plant, in the pot,
upside down and on the corner of a table gently tap the plant out
of the pot. Depending on how root bound the plant is, loosen the
roots by teasing them on the bottom. Place it into the new pot and
fill with potting mix gently firming down and tapping the pot as
you go. Plant to the same level (depth) as the original pot with
about 1 cm clearance around the top of the pot to allow for watering.
A quality potting mix
contains controlled release fertiliser which will last for up to
nine months. Additional liquid feeding every fortnight in summer
will be beneficial. You can use Phostrogen or Thrive Flower and
Fruit mixed into water. Follow the recommended rate on the pack.
If you are not too sure
about repotting yourself, some garden centres offer a repotting
service, for a nominal fee, if you purchase a pot you will
need to check with your local garden centre to see if they offer
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
with permission from NZOOM Home and Garden content,
from the previous
The views expressed here are not necessarily those of the RNZIH