Planters.com belongs to one of the most recognizable snack brands in America, which is the first thing to know before anything else. The site is essentially the brand's home base: it hosts product info, recipes, and links to find Planters products in stores or online. That context matters for a trust review, because the expectations are different from a random e-commerce store.
This domain has been active for over three decades and is registered through an established registrar, which are good signs. The site also publishes solid security protections and has both a privacy policy and terms of use. In other words, if someone set out to build a convincing Planters clone, they'd have to work hard to match this record.
The one minor flag is the domain renewal date that shows up in Whois, but that's standard annual renewal for a major brand and not a worry. If you're on planters.com to browse or to click through to buy nuts, you're dealing with the legitimate operation.