01 - Preheat oven to 350°F. Grease and line an 8-inch square baking pan with parchment paper.
02 - In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt until well combined.
03 - Add buttermilk, vegetable oil, egg, and vanilla extract 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 or until a toothpick inserted in center comes out clean. Cool completely in pan.
05 - While cake cools, whip heavy cream with powdered sugar, vanilla, and softened cream cheese until medium-stiff peaks form. Refrigerate until ready to use.
06 - Break cooled cake into small pieces and crumble into fine, soil-like texture using hands or fork.
07 - Fill clean flower pots or dessert cups with a layer of crumbled chocolate cake, pressing gently to compact.
08 - Spoon a layer of whipped cream filling over the cake crumbs, spreading evenly.
09 - Add another layer of crumbled cake over the cream filling.
10 - Generously top with chocolate cookie crumbs to completely cover the surface, creating the appearance of garden soil.
11 - Decorate with edible flowers, mint leaves, and fresh herb sprouts to create a garden effect. Refrigerate for at least 30 minutes before serving.