The ornamental design for a modular revolving gardenstand, as shown and described.
FIG. 1 is a perspective view of a modular revolving garden stand, showing my new design;
FIG. 2 is an exploded view thereof;
FIG. 3 is a front view thereof with a rear view being a mirror image;
FIG. 4 is left side view thereof with a right side view being a mirror image;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
FIGS. 5 and 6 are depicted slightly enlarged for clarity of illustration.
The broken line showing of an ornament is for the purpose of illustrating interchangeable cap ornamentation and the broken line showing of a center line is for the purpose of illustrating modular attachment and forms no part of the claimed design.