Guides
Plant problems, explained from the history
One page per problem: what it usually is, how to tell it from the thing it gets mistaken for, what to do, and what not to do. Written for British homes and British water, and each one ends with the plant's care facts and whether it is safe around cats and dogs.
More pages are on the way, one problem at a time. If yours is not here yet, the app can usually work it out from what you have logged — Sabz on the App Store.