Well-draining soil is a must when growing Tacca bat flowers and should remain slightly moist on a continual basis. Soil should be light and retain moisture but never allowed to get soggy. Try making your own potting mix by adding perlite and vermiculite to a good peat based soil. Plants growing outdoors benefit from sand in the soil, just not too much. Bat flower info says the plant should be allowed to dry out during dormancy. Keep this in mind when providing bat flower care during its time of rest, in autumn and winter. In warmer areas, bat flowers reportedly do not experience a dormant period. Fertilize monthly or every six weeks with a regular house plant food and occasionally with an acid boosting plant food, such as the one you use for your azaleas. Now that you’ve learned how to grow a bat flower, try growing your own to see if you have the green thumb for this plant. You’re likely to get lots of comments and questions about this unusual, flowering plant.