wife and I have a two-year-old rosemary hedge grown from cuttings
from the one bush. The hedge is now about 0.5 to 1 metre high and
is a shelter for our vege garden; it is planted in the vege garden
up against a low brick and concrete wall. For several months about
25% of the rosemary plants have turned brown and died. Despite the
Nelson drought, I managed to keep the vege garden going. Why is
the rosemary dying?
rosemary may have mites. The leaves will be matted together in a
web, and before the leaves go brown they will look mottled. Tiny
spider-like insects will be visible on the foliage.
To control mites, spray
with Conqueror Oil or Mavrik. Cut back the damaged foliage and your
rosemary should come away.
If it isn't mites, have
you cultivated too closely to the roots of your rosemary hedge?
They have a superficial fibrous root system.
Rosemary is a Mediterranean
plant and likes a warm, sunny, free-draining position. They don't
like being overwatered, excessive amounts of fertiliser or hard
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