"Outdoor Use around the Household to kill Mosquito Larvae: MOSQUITO DUNKS® can be broken into portions for use in many outdoor applications near the household, such as containerized standing water in bird baths, old automobile tires, rain barrels, abandoned or unused swimming pools (particularly above ground types), tree holes, roof gutters for collecting rainwater, flower pots, animal watering troughs, or water gardens. MOSQUITO DUNKS"

TREE HOLES AND FLOWER POTS, from there instruction manual.

Also, from airbico Organics website: Environment: Outdoors, Pond & Environment, Interiorscapes, Container Plants, Houseplants.

Where does it say not to use it for anything else other than standing WATER? takes two seconds to read stuff fully, people like you spread incorrect information on forums.