01 - Preheat oven to 350°F. Grease and line an 8-inch square baking pan.
02 - In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt until well combined.
03 - Add buttermilk, oil, egg, and vanilla to the dry mixture. Mix until smooth, then pour in hot water and mix again until fully incorporated.
04 - Pour batter into prepared pan. Bake for 25-30 minutes until a toothpick inserted comes out clean. Cool completely before proceeding.
05 - While cake cools, whip heavy cream with powdered sugar, vanilla, and cream cheese until medium-stiff peaks form. Keep chilled.
06 - Break cooled chocolate cake into small, even crumbs using your hands or a fork.
07 - Fill clean flower pots or dessert cups with alternating layers: crumbled cake, then creamy filling. Repeat until containers are nearly full.
08 - Generously cover the top layer with chocolate cookie crumbs to create the appearance of garden soil.
09 - Arrange edible flowers, mint leaves, and herb sprigs on top of the soil layer to mimic a blooming garden.
10 - Refrigerate for at least 30 minutes before serving to allow flavors to meld and textures to set.