Scaevola is a relatively easy plant to take care of and is resistant to many climate conditions. However, it is still susceptible to some problems that you should keep an eye out for. Firstly, this plant is drought-tolerant, therefore if its soil gets too wet or stays wet for too long their roots could become damaged and rot. Because these annuals are native to Australia, they are sensitive to phosphorous because they have adapted to soils that have not contained large amounts of this element. If you notice your plant has discoloration and their foliage is wilted it could be the soil you are using. Pests are a slight issue for this plant and are something to keep your eyes open to. If their foliage is wilted and it's not the soil or from them being overwatered, it could be aphids or spider mites. Mites will suck large amounts of sap from the foliage causing them to be wilted or turn yellow.