The ornamental design for a gardenlamp, as shown and described.
FIG. 1 is a front, right, and top perspective view of a garden lamp, showing my design.
FIG. 2 is a rear, left, and bottom perspective view thereof.
FIG. 3 is a front elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a left side elevation view thereof.
FIG. 6 is a right side elevation view thereof.
FIG. 7 is a top plan view thereof.
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged view of a blade holder labeled 9 in FIG. 3.
The dash-dash broken lines in the figures illustrate portions of the garden lamp. The dash-dot broken-line circle and lead line in FIGS. 3 and 9, which illustrate the boundary of the enlarged view, represents a detail call-out. The broken lines form no part of the claimed design.