I have a Daphne odora which had aphids on it early
this spring and I kept hosing it with water and got rid of the aphids
(didn’t spray with any chemicals). Lost a lot of leaves but now has new
growth. Problem now is all the leaves look wilted like it lacks water and
doesn’t seem to be growing. I have watered it real good during the hot weather
but it doesn’t seem to be working. The plant is about 7-8 years old and
has done well until this year. It gets morning sun and afternoon shade.
Am I watering too much or is it because of the heat?
Daphnes can be a bit fussy, and as this article
by Sarah Raven on Daphnes from the British paper the Telegraph mentions:
“Daphnes like life pretty constant, not too wet and not too dry, so, particularly when they’re settling in, give them a little regular watering if the rain doesn’t do it for you. They need and like good drainage, so always add plenty of organic matter (and some grit if you garden on clay). And don’t despair if your plants don’t go on forever. Daphnes rarely last more than 15 years and you’ll almost never see a shrub older than 20. Plan on taking cuttings after flowering every five years or so to make sure you always have a daphne or two in your garden.”
Signs of winter damage are similar to signs of drought problems, so it
can be confusing. The foliage can be scorched if the plant receives hot afternoon sun, but your plant is in
afternoon shade. To add to the confusion, yellowed leaves which drop can
be symptomatic of excess water AND excess drought, as well as a delayed
reaction to a cold winter. My own Daphne odora has this same problem, and
always loses some of its leaves, develops new growth, but grows slowly.
This plant requires good drainage, so that is another consideration.
Here is local gardener Ed Hume on Daphne odora:
“It is important to note that this type of Daphne needs to planted in a
spot where it gets protection from the hot mid-day sun. An eastern
location or similar spot is ideal. In addition, this one is not quite as
hardy as the others, and may need to be given some cover protection,
should temperatures dip below 25 degrees. Frost or sun burn, will show-up
in a blackening of the tips of the leaves and in severe cases the leaves
are apt to drop from the plant. The dark green evergreen leaves often
have a cream-colored margin along the outside edge.”
Another local gardening expert, Ciscoe Morris, says the following:
“These plants will thrive in the right conditions, but you will be
disappointed if you plant it in the wrong spot.Growing Conditions: Morning sun; organic, well-draining soil. Do not over-water in summer, especially in clay soil. Daphne odoras do best in morning sun and afternoon shade. Give it
well-draining soil (amend with compost). During summer, water only as
often as needed to keep it alive.”
Based on all the variables, I suggest you water it less often, and check
to make sure it has adequate drainage. This can be a challenging plant,
so be patient and hope for the best.