I have to leave my plants frequently for up to a month. I'm having good luck with these watering globes. I put 2 of them in each pot.
http://www.yourstoreonline.net...
Here is some information that may be useful.
http://www.gardeners.com/how-t...
If it's affordable there are usually housesitters who will tend to plants or animals while you're away. Maybe you could have them come a few times.
