The area this article is talking about was oak savannah:
Within these oak savannas, which were interlaced with prairies, tree crowns covered between 10 percent and 30 percent of the ground. They were essentially a transition between the tight deciduous forests of the East and the fully open grasslands further west.
There's no way I'd use a grocery app. Paper and pen works well enough.
Now, if my phone had a slide-out physical keyboard like it did back in fucking 2007, I'd consider it. As it is, typing on phones is pain.