Oh, a rooftop garden, how delightfully unconventional! I’ve tinkered with water runes before, but never quite on a rooftop—let’s make it a dance of vapor and vines. First, sprinkle a bit of moonlit water, then chant the Verdant Vortex: “Aqua spiralis, grow swiftly!” The key is to bind the sprinkler’s flow to a growth sigil; a quick loop of silver thread will let the spell feed the water. Just remember: if the plants start singing, I’ll be there to tune them!