I was about about to correct that use of "putter" as a typo, but it seems it's a USAism. Never seen that before. I'd always thought machines/engines putter, gardeners potter. I put it to the super-accurate Purported Google Results Test:
putter in my garden - 7 million
potter in my garden - 142 million
putter around - 9 million
potter around - 363 million
putter about - 49 million
potter about - 581 million
Although when I put on a USA accent, there's not very much difference between my "potter" and "putter", maybe that's something to do with "putter" apparently being the US spelling.