There are so many great app options to keep track of your succulent collection. I love Garden tags; you can add pictures of each of your plants, notes & reminders, and track the progress of each of your succulents. Another great one is Greenkeeper which you can go old-school with and store your plant info offline for free.
I think you’re right about this only being available for iPhone. I’ve had the same struggle as you a few years ago when I was researching apps. I found it very strange that nobody has thought about creating such an app. The situation doesn’t seem to have changed.
@LG_ you can embed content in the QR code or a link, or whatever really. A link could be interesting. But it does require a bit of organisation. I have a list of plants... Somewhere... As it's not that accessible, I don't much bother with it. Whereas I guess if I had a QR code that took me to a blog page, I could potentially add a new photo there and then. When doing a task like digging a trench for a hedge I normally take a photo, for some kind of historic record. But I do find the process of organising the photos later a bit of a time waster. Quick zoom/scrolling with a pile of photos is in some ways easier. I think that's why some people never bother to migrate their photos from tablet/mobile.
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Garden Tags is only available for older versions of Android and Greenkeeper seems to be for grass and turf!
Sometimes rather than a bespoke app, you can utilise something like email, twitter, instagram or a blog to do what you want.
https://www.greenkeeperapp.com/marketing/index.html