I am doing a party where they are looking for submerged tulips in one vase, submerged gerbers in another and submerged dendrobiums in the last. The dendrobiums will be in a pilsner, the tulips in a 14"H cylinder, and the gerbers in a 10" tall cube. I've worked with submerging dendrobs and have had to glue them down first before adding water to keep them from floating to top, but have never submerged tulips or gerbers. I'm assuming due to their thicker and waxier stems that just wrapping them inside vase should keep them stable. Is there anything I need to know, and I'd also like to hear any other ideas about other techniques than glue. The glue did work, but I'm curious about other possible techniques.