Hello - I just bought a home in Mesa Arizona. The yard has two large canary Island date palms about 40+ years old. They are not on a watering system and the person who I bought the house from passed away so I do not know how he took care of them. What I'm wondering is, do I need to water them or do they not require regular waterings? The neighbors told me they do not require watering. I will not be living there year round. Thank you.