Wood Mulch Around New Gardenias Can Create Problems

Q. I planted about 12 gardenias a couple of months ago
and they appear to be dying. I checked the soil and it’s evenly damp. They have
two, 2gph emitters and they were all being watered three times a week for 20
minutes.

A. From the picture you sent it looks like a lack of
water. Before you saying “No, can’t be” let me explain something.

            You have
a lot invested in those gardenias. From the picture I can see you applied
surface wood mulch surrounding plants and it looks quite deep. Nice job. These
gardenias will appreciate the wood mulch.

            However,
wood mulch can create a problem around young plants. When this wood mulch is in
contact with the stems of young plants, it can keep the surrounding soil and
stem too wet. This constant “wetness” around the stem can foster a disease
called “collar rot”. Disease organisms attack the stem, essentially choking the
plant, and shutting off its water supply.

 Diseases of Gardenias

            Pull the
mulch away from the stems about 12 inches and do not let it come in direct contact
with the stem. The wood mulch will help the plants but it cannot come in
contact with young stems until they get quite a bit older.