In reality, our limited garden space is reserved for edibles. I have neither the skill nor the time to plant a proper spooky garden, but I can dream.
My ideal dark garden is one that is dark by day, but transforms into a moon garden at night. Daytime colors would be classic goth: black, purple, red. At night, white and silver.
The Everyday Goth is also a garden dreamer, and has a nice guide for building a gothic garden. I like it because she works in proper gardening layers.
The classic site for dark gardening, Gothic Gardening, has been partially preserved on Archive.org. The themes, along with pictures, have been preserved at Aokley.com.
Night-blooming Jasmine has an incredible fragrance. A vine covered the front porch of our house in Portland. It was a joy to walk through in the evening.
Silver Sage has a shimmery look, and soft leaves. iVillage has some other good moon garden suggestions.
White Flower Farm not only specializes in white flowers, they have a section dedicated to moon garden plants.
I know it’s not very gothy, but I’d have to sneak a fairy door into my garden somewhere.
And a dragon. Definitely a dragon.