If you find one you really like, let me know! I use different things, but the lack of consistency takes its toll. Here is what I've used before, though:
* NGA's own planting calendar, personalized based on your zip code (as I recall)
* Various Google sources, including this:
http://veggieharvest.com/calen...
* Cell phone calendar reminders
* The latest source I'm likely to use is this:
Which includes plant care on some common plants each month, like this:
And a planting calendar that includes zone-based planting dates AS WELL AS best dates to plant based on the status of the moon (which I didn't know was a thing, but I'm interested in trying):
