Turn any normal mouth mason jar into an efficient microgreen growing system with this innovative bottle top adapter. Designed to fit standard 32 oz normal mouth mason jars, this adapter delivers the perfect amount of water directly to your microgreens as they grow. No more daily watering by hand - simply fill the bottle, attach the adapter, and your microgreens will self-water for up to a week. Watch your microgreens thrive with this hassle-free irrigation solution. Great for windowsills, countertops or larger indoor growing spaces, it's an ideal way to grow nutritious microgreens like broccoli, lettuce and more anywhere you have a spare bottle. Mason jar not included. Does not fit wide mouth mason jars.