For those who have to travel regularly and are not at home continuously for a week or more, one of the best flowering plants which can be purchased are the desert rose or adenium
Most plants will wilt and die , if they are not watered for a week, however the adenium plants will survive without being watered daily for more than one week.
However, it is not very easy to find supplied of adenium plants, especially those with white flowers.
The domain investor has plants with pink flowers and can provide a limited number of seeds to those who are interested.