Rhododendronnetzwanze (Stephanitis rhododendri) und Andromedanetzwanze (S. takeyai) an Rhododendron (Rhododendron spec.) Schadbilder Catawba Rhododendron 'Grandiflorum' Rhododendron catawbiense 'Grandiflorum' Flora Mdeli This is a very interesting horticultural process called guttation! When the soil is nice and hydrated at night, root pressure builds up. Since the plant isn't transpiring (sweating) in the dark, it