Involved in primary cell wall organization. Required for the accumulation of crystalline cellulose. a sn-glycero-3-phosphodiester + H2O = an alcohol + H(+) + sn-glycerol 3-phosphate Expressed in roots, shoots, rosette and cauline leaves, stems, flowers and siliques. Defective in root hair formation (PubMed:16367956, PubMed:18718934). This phenotype is partially suppressed by application of exogenous borate (PubMed:18718934). Belongs to the glycerophosphoryl diester phosphodiesterase family.