Gardenia leaves/stems dying

We have a gardenia that was very healthy and blooming. It’s a cluster of some 4-5 stems, in a well draining soil (about a 12″ pot with lots of holes). It would have the occasional yellow leaf, but otherwise in…

Vinca die-back

Many of my vinca ground-cover plants are dying back. These plants have been healthy for many years. Symptoms include: black stem, yellowing leaves that turn brown and fall off. I am hoping there is a way to reduce the spread.…