I have only been using this app for a few hours but so far, its great. The library of plants is quite extensive. You can adjust by month to do succession plantings. There is a journal option. I read the negative reviews about bugs and the like so I waited for a new version. So far, this one seems fine--no problems whatsoever and I envision it being a useful planning tool for my veggie and herb gardens.
Awastro about Grow Planner