Golden Rod (Solidago virgaurea) is known to have diuretic properties. Often used to support lower urinary tract health.
Infuse 2 heaped teaspoons of Golden Rod in a cup of boiling water, steep for 5 minutes. Strain and drink several cups daily.
If not using the tea straight away, you can store it in a covered jug or container in the fridge for up to 24 hours and gently warm the mixture before drinking.