I'd like to add some ball python-safe plants to my new enclosure but I want to be really careful not to put in anything that could harm my BP. I've read that some plants like aloe vera and devil's ivy are safe for BPs. I was wondering if anyone here can confirm that and if there are any other BP-safe plants I could add?

Also wondering how to ensure that the soil I put in is free of chemical fertilizers...etc. and creepy crawlies? Any advice is appreciated!