Things I was doing at work in a public garden when someone shouted, "Look, she's planting!" presumably to educate their child about gardening

Weeding (i.e., pulling plants out of a garden. That is, the opposite of planting.)

Watering

Raking woodchips in a path

Picking dead leaves out of a garden bed and putting them in a large plastic bucket

Scooping leaves with net out of a small pond

Making a fence by hammering bamboo poles into the ground (Is this really what people think planting looks like? Really?)

Pruning (i.e., cutting things off of plants)

Bonus: While I was walking through a gate with a tub full of dead leaves, a mother shouted, "Look, honey! She's.... gardening."

True that.