How to water vinca flowers when absent from home for half a month？

[andy guo]

Hello,I will be absent from home for half a month, so no one will water my vinca flowers. how can I do？

 

[Carol Dee]

Do you have friends or family close enough to come over and do it for you?

 

[andy guo]

Do you have friends or family close enough to come over and do it for you?

I am not familiar with them,so I don't want to bother them. My friend suggests that I can prepare a plastic bag filled with water, and then puncture a small hole at the bottom of the bag with a needle.Placing it in flowers pots, water will slowly leak out to moist soil through the small hole. Does it work?