From Ryzom Wiki
The weedling is an aerial root of the same family as the manhart. It sometimes resembles a large snake-like creature that emerges undulating from the ground.
Adjusted to its semi-aquatic environment, it uses its raised root system to protect its leaves and flowers by holding them out of the water.
The inside of these roots teems with insects of all kinds that live in an ecosystem limited to weedling. That is why, unlike the manharts, weedlings can not be used as shelters: it is impossible to settle there without being very quickly covered with insects.
Traditionally, the bride and groom pass under their arches to celebrate their union.