Hydrolyzes glycerolphosphoglycerol, glycerophosphocholine and glycerophosphoethanolamine in vitro. a sn-glycero-3-phosphodiester + H2O = an alcohol + H(+) + sn-glycerol 3-phosphate A number of isoforms are produced. According to EST sequences. Expressed in rosette and cauline leaves, stems, flowers and siliques. Belongs to the glycerophosphoryl diester phosphodiesterase family.