That is what I am doing Potters I've been getting loads of images of weeds off google and saving them in a file so I can learn to tell the difference as I have started doing the same throwing wild flower seeds on a boarder by the side of my house and I can not tell what is flower or weed one of my problems though is if it looks pretty I keep it
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It helps if you get a book to identify the wild flowers as well that way you can distinguish them from the weeds.