Besides reflecting on the particularities of marsh ecology, the following quotation also reveals why Luke Skywalker had to train in Dagobah.
"What should the seeker of enlightenment do? Fearlessly look into the seat of the trouble. Where the grief is the strongest, the doubt most disturbing, the turmoil most opaque, the ignorance most dark - that is the place where enlightenment will break through. Lotuses only grow in swamps."
David Brazier, from the Feeling Buddha