Add the lavender, water, and sugar to a small saucepan. Bring to a boil over a medium-high heat.
Once the sugar completely dissolves, turn off the burner and let the mixture sit for 15-20 minutes.
Strain through a fine-mesh sieve into a jar or storage container once the syrup is as strong as you'd like it.
Refrigerate in a closed container for up to 1 month.