Tomatoes appear to work simple enough, until you harvest them
the first time: The plant stays! However, after the 3rd to 5th
harvest, the plant wilts and needs to be removed, since no more
tomatoes will grow on the plant. Per harvest you can get 1-2
tomatoes only. You can craft the tomatoes to tomato seeds, as
expected.
Melons naturally grow on their side with stems attached, so place
them on their side with stem to the plant. I've modified the
textures to make them visually connect properly, and tuned the
bottom texture a bit more to look like an actual melon bottom.
Yes, I actually had a watermelon at my house and looked at it's
rear end.
Corn plants are 2 blocks high, and yield corn cobs. These can be
cooked to corn-on-the-cob, or processed to make corn seed (corn
kernels, basically).
Digging a mature plant yields the corn cob. A harvested corn plant
"wilts", and needs to be dug away to make the land usable, or can
be left as ornamental 2-block plant. Digging either top or bottom
block works in all cases, although I need to verify that I've
covered every block combo.
This adds a bit more delay in between melon harvests, as
you need to wait for a flower to grow first, and then a melon.
Slightly more realistic, plus the flower doesn't pop up
immediately after harvesting.
This is more realistic: The melon flower turns into a melon
once it's ready, so while a melon is attached, the flower is
gone signifying that it's not ready to grow another melon.
The flower pops back immediately once you remove the melon block.
This should be entirely working now - MELONS!
Work as expected. A seed grows to a plant, plant flowers and an
adjacent melon block grows, and is attached with a stem. Once the
melon block is harvested (which drops 3-5 melon slices), the
stem is lost and the plant will grow a new melon from it's mature
stage.