~~~ ***Use Mason Jars (or glass baby food jars!)*** I like the oil lamp idea. Tea lights burn way too quick and this could be cleaner with tight lid instead of a floating candle. Just more mason jar purposeful ideas
Herbs in coffee cans, hung with zip ties. Drill a hole in coffee cans & zip tie to railings! You could pretty much mount any container, like a box in this same way. bigger containers may require more zip ties.