The ornamental design for a spiralplanter, as shown and described.
FIG. 1 is a perspective view of a spiral planter in accordance with the present invention, shown in an environment of use;
FIG. 2 is another perspective view thereof;
FIG. 3 is a top perspective view thereof, shown with the environment removed;
FIG. 4 is a bottom perspective view thereof;
FIG. 5 is a side view thereof;
FIG. 6 is an opposite side view thereof;
FIG. 7 is an end view thereof;
FIG. 8 is an opposite end view thereof;
FIG. 9 is a top plan view thereof; and,
FIG. 10 is a bottom plan view thereof.
The broken lines in the figures are included to show environmental features and portions of the spiral planter that form no part of the claimed design.