(c) Broad areas of simple lawn or meadow, little interrupted by trees or other obstacles, where the main item of maintenance cost is periodic wholesale cutting by horse or power mowers.
(d) Intricate combinations of turf with plantations and other obstacles, requiring frequent hand mowing under difficult conditions and involving hand cultivation, weeding, and other control of the interspersed plantations.
(e) Areas of a sort requiring still more intensive gardening operations to secure and maintain the results at which they are aimed.
Other things being equal, the above indicated variations in type of grounds ordinarily account for a range in the amount of labor required for suitable maintenance, varying from a maximum of about one man per year for each acre or less in type “e,” to a minimum of one man for each twenty acres or more, type “b;” with the possibility of an almost indefinite reduction of maintenance labor in type “a,” in those cases where intensive human use does not enter in to upset the balance and require special counteractive measures.
We have attempted roughly to classify the lands of the Botanical Garden according to the types of landscape treatment as affecting maintenance costs; grouping them in three classes:
Class 1
²⁄₃ to 2 acres per man, as in type “e” and part of type “d.”
Class 2
2 to 6 acres per man, as in part of type “d” and in type “c.”
Class 3