Vinca Flower Cutting. Some dont change the water but it is best if you. Annual vinca is invincible to most pests but it can succumb to stem and root rot caused by Phytophthoraa soil- and water-borne fungal-like microorganism.
Remove leaves that will be below water level so they dont rot and foul the water. Special Tips for Growing Vinca Periwinkle or Sadabhar Cuttings Start these procedures in early spring. If you want.
To deadhead grasp a spent flower below its base and above a set of leaves.
The disease spreads when the fungal spores in the soil are splashed on the plants when you water or when it rains. Some dont change the water but it is best if you. Deadheading is the process of pruning its faded flowers before their seeds mature. The seeds of the vinca are very difficult to germinate so propagation by cuttings is most common.