Pick up free paint sticks at your local hardware or paint store. Use a stencil and black sharpie pen to write the names of seeds or seedlings you planted and mark their spot. The sticks should last you a season.
Plant this 'sacrificial' flower wherever you have aphid trouble in your garden. They will draw common garden pests away from your prized crops.
If you plan on putting up birdhouses, put them up in groups of 3, as the male bird will more likely find a mate if he has 3 choices of lodging to present to the female he is courting.
Plant your strawberries in burlap instead of plastic.
It will keep the strawberries from rotting and the weeds down.