A gardener robot should be able to:

- plant new plants (hold plant in pot, remove plant from pot, shake excess soil, dig hole using trowel, place plant in hole, pat down earth, water plant using watering can)

- dig up weeds (using e.g. a hoe, fingers)

- set up a trellis (attach trellis to wall using drilled-in screws; wrap vines around trellis)

- water plants with hose (unwrap hose, turn on tap, spray plants)

etc.

What form factor will beat humans at all these tasks?

Four different drones, or one drone with four tool attachments. The robot shouldn't need to "use a trowel"; it should be a trowel.