Bring Me A Shrubbery!

We must replenish our supply of sanguine hibiscus, which we use for a number of purposes. They used to grow thick as shrubs, but the lowering of the marsh's water levels means that they can only be found now in the Underbog at Coilfang Reservoir, under Serpent Lake.$B$BIt is said that the shamblers, bog giants, and underbats there consider them a delicacy. So, if you are to help us, you must retrieve the flowers from them.