Just wanted to let everyone know that currently the gardening system isn't quite 100% functional. While the planting aspects seem to work just fine, the plantings are not persistent through crashes/resets.
Now let me be specific in what I mean. The plant growth time is listed at 12 real time hours or so, but currently this is more like 12 uninterrupted real time hours. So if you plant your seeds and the server crashes or resets before that 12 hour period is up, your seeds will be lost and no plant will sprout.
Basically this means that if you want your plants to grow, you want to plant your seeds right after a reset and just hope the server can make that 12 hour crunch time.
Planting in off-peak play times might also be a good idea. But in general it really is a crap shoot. This may seem discouraging, but know that there are players who have successfully planted and grown plants. So it is possible!
There are some other issues with varied plant types appearing, but hopefully in time that will be ironed out.