ORGANIZATION
I wanted to create a greenhouse that could organize all of my crops. I made this for personal use, but I thought I'd share this for anyone who wanted it. Here's how I planned it.
• Right - 75 spots (3 spots for iridum sprinklers, 72 spots for Ancient Fruit or another cash crop, like cranberries.)
• Top Left - Wild Seeds (4 spots for each season and a spot in the middle for an iridium sprinkler)
• Bottom Left - 10 spots for the 10 continuous crops (Blueberry, Corn etc.; Grape is excluded since you can grow them with wild seeds)
• Mid Left - 24 spots for the 24 non-continuous, non-foraging crops (flowers, pumpkins etc.)
• Top Middle - 6 spots for each type of tree.
• Bottom Middle - Empty space for chests, seedmakers, etc.

Here's a sample layout:


SPRINKLER EFFICIENCY
I also thought the 12x10 plot of farming space was awkward, since no matter how you lay out your sprinklers, you're guaranteed to be wasting sprinkler space. To fix this, I made every section even with the reach of iridium sprinklers.


INSTALLATION (SMAPI not needed)
Back up your Stardew Valley Steam Folder.
Download and unzip the contents of the file.
Move the Greenhouse.xnb file to this folder: C:\Program Files (x86)\Steam\steamapps\common\Stardew Valley\Content\Maps
If you get asked to replace, click 'OK'

BUGS
• The tub of water at the north side of the greenhouse does not provide water.

• Configurable Machines does not work inside the greenhouse. It works outside the greenhouse however.

• Exiting the greenhouse is fine, but entering the greenhouse warps you to the default warp position for the greenhouse, which is in the middle of the modded greenhouse. I could fix the exit, but I don't know how to fix the entrance.