Xtremehorticulture

Jerusalem Sage May Need Some TLC

Q.  My
phlomis plants have leaves that have died and some have yellow with brown tips.
Should I cut it down in February? Should I increase the water? Do I just leave
it alone? What causes the edge of the leaves to dry up?

A.  Commonly,
this plant is called Jerusalem sage.  It
grows like a weed in the Mediterranean region and has become somewhat of a pest
in parts of England where it escaped from gardens and become a “weed”. 
            Judging
from the pictures you sent, the newest growth looks great!  It’s some of the older growth which has yellowed
or turned brown.  Cut the plant back to
the ground just like you would lantana, and let it grow again.  It will.



Want to see what it looks like?

            Even
though it has started to grow, you can do it now.  Next year cut it back in January just before
it starts to grow.  Apply compost to the top
of the soil around it in a 12-inch ring, 1 inch deep, to improve growth, color
and flowering.  If it’s growing in rock,
apply compost on top of the rock and wash it in with a hose.
            If
a plant is going to be a weed it might as well be pretty and taste good!  This is both. Most people grow it as an
ornamental because of its yellow flowers. 
But it’s in the same family of plants as mint and basil so it smells and
tastes good.  Use the leaves as a
substitute for common sage; pull off fresh leaves, let them dry, put them in a
plastic bag for storage and crush them directly when preparing stuffing or
cooking meat.
            Our
climate is not Mediterranean and our soils are worse than Mediterranean soils.  Grow Jerusalem sage as you would any other perennial
vegetable or herb in our desert climate and soils.  Do not plant in locations where there is
intense temperatures and mix compost into the soil at the time of planting in a
ratio of 1 to 1.  

            My guess is the damage
to the leaves is old, from winter cold temperatures and some watering problems
perhaps.  Avoid growing it on the south
and west sides in intense hot locations. 
Water and fertilize as you would any other perennial vegetable or
herb.  Pinch new growth for a fuller
canopy and harvest young leaves for more intense flavor and aroma.

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