My Texas Plumbago Is Drying Up

Establishment

• Plumbago perform best once they are established in their environment. Younger plants are more vulnerable to the elements and dry out faster than mature plants because the root system is not as secure. Transplants and immature starts require constant care and attention to keep remain stable enough to survive tough weather and neglect.

Alkalinity

• Slightly acidic soil is best for plumbago, so do not amend with lime. A plumbago can look like it is drying due to a mineral deficiency. Alkaline soil causes a deficiency in manganese, turning the leaves yellow. An application of manganese sulfate will reverse the leaf color and dry appearance.

Watering

• Plumbago are finicky regarding watering. An overwatered plumbago will resemble one that is underwatered and may give the impression that the plant is drying out. Plumbago prefer light, dry soil with good drainage rather than having their roots soaked. Avoid wetting the flowers or leaves on this plant. Under a hot sun, even a few drops of water may burn the flowers and leaves.

Pests

• Plumbago is normally very resistant to disease and insects. In some areas, aphids and caterpillars can be a nuisance, but recently a new threat has been revealed. According to the University of Florida Extension Service, chili thrips, which are widespread in Asia, have immigrated to the United States and become a real menace to plumbago. Chili thrips can cause plumbago to look dry, stunted and brittle, with burned leaves.