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I guess one limitation is that gardens probably mature at slightly different rates (e.g. if you have a mild cold spell, development goes on 'hold' for a bit, which might put you out of sync). I guess Eric would have to interview some expert gardeners to ascertain the scope of the issue.

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Presumably, to a first approximation, you could track the weather at your customers' location, and know what is going on with their plants. This would allow you to tailor your emails - and your product suggestions - over time.

Gardeners are ferocious, ferocious competitors. They are compelled to post pictures of their plants. Believe me; squeezing as much out of your plot as you can can become an obsession.

All that to say, bragging / help requests are going to be strong motivations for gardeners in the US, and I'm sure they'll be posting information if the OP wants to make a community out of the site.

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