During a portion of this time, Plitt served part-time as a member of the research staff of the Maryland College of Pharmacy.
He led Saturday afternoon trips around the Baltimore area to botanize and instruct others interested in plant identification.
Plitt kept accurate notes on each of these trips and eventually accumulated enough data to fill 29 volumes.
(Sipple 1999) These journals are a priceless record of the varied species of plants which once grew in habitats now buried beneath urban landscapes.
(Plitt 1908) Apparently some of the specimens that he used for that talk were found by Charlie Davis in little glass boxes in the archives of The Natural History Society of Maryland.