Place the plant in an area of the yard where it won't be under the light of the sun continuously. You want the plant to get some light, but too much can be detrimental.
Plant the dragon tongue in an area of your garden where the soil is very moist. This is particularly true if it's not an established plant.
Water the plant regularly. When it's newly planted, you want to make sure that it doesn't dry out in between waterings.
Moisten the soil of the plant rather than the leaves. Because the roots are in the soil, it's important that you water the soil so that it makes its way down to the roots.