After his travels, Kalm worked in Turku, both with the botanical garden of the Academy and after 1752 with this experimental plantings in Sipsalo, in Hirvensalo near Turku. Here, he cultivated many seeds and plants from his travels to North America, introducing several new genus to Finland, like the now more than common Crataegus grayana, Rubus odoratus and Parthenocissus inserta. He grew several species of crabapples, members of the Malus family, some of which are mentioned in old documents written by Kalm.
Only a few crabapples were still hanging to the branches... this tree was very old, and might be one of the varieties grown from the seed that Kalm brought to Sipsalo; note the unusual, oval form.
Kalm faced many difficulties at his experimental plantings: the soil was quite heavy containing a lot of clay, and despite the South facing exposure, it kept the cold until late in springtime. Periods of severe cold damaged many of the plants he had managed to germinate and grow from the seeds he had collected and imported. Money was always scarce and Kalm worked long days both as a Professor at the Academy and after that at the plantings. K