Preheat the oven to 325°F. Grease and flour a9-by-3 inch loaf pan.
In a medium bowl, whisk together the flours,salt, baking powder and soda, and spices, and set aside.
Place the sugar, lavender honey, and eggs in the bowl of an electric mixer fitted with the paddle attachment and beat them together on medium speed until the mixture is creamy and light, about a minute. Beat in the melted, cooled butter, followed by the orange juice and zest and vanilla.
In a small bowl, stir together the yogurt and hot water. Beat in 1/3 of the dry ingredients into the sugar and butter mixture, scrape down the sides of the bowl, then beat in 1/2 of the yogurt mixture. Follow with another 1/3 of the dry ingredients, followed by the rest of the yogurt, and ending with the last of the dry ingredients, scraping down the sides of the bowl after each addition. Beat the batter well for 20 seconds to fully emulsify it.
Pour the batter into the prepared pan, smoothing and evening the top. Bake the cake on the center rack for 40 minutes, rotating it halfway through the baking time to ensure even browning. The cake is done when it is cracked and firm to the touch, and pulling away from the sides of the pan. A cake center inserted in the center should come out clean.
Allow the cake to cool for 10 minutes in the pan before removing it to a rack to cool completely. To serve, cut into even slices. The cake may be stored for up to 3 days in anairtight container.