the classic ref on Manx Victorian gardens is
"A history of Manx Gardens" by the late Larch S Garrad (1985 - isbn 0 948588-01-2) but this has no mention (in the index) of the name Todd nor of the gardens you mention (?ballaquale) except for Ballaughton nursery which Larch dates to 1811-1819 originally intended to provide plants for Castle Mona