golf tees can be quite useful in the garden. in the spring, put tees in the gaps between bulbs so you can fill in the gaps in the fall.
when planting a new perennial, mark it with a tee so you know where it will emerge in the spring.
in the vegetable garden, mark the ends of rows with tees until your seedlings appear so you don’t overplant.
golf tees are inconspicuous to a casual garden admirer, but easy to see if you’re looking for them. they stay in place for several seasons if need be, and they’re easily color coded!