Q.Hardy Geraniums
My hardy geranium is healthy and thriving, but it no longer flowers. Is there a remedy for this?
You could have too much nitrogen in your soil.
Excess nitrogen can cause a nice green plant but little or no flowering.
You can have your soil tested to make corrections.
A dose of phosphorous is a great way to boost flowering.
Bone Meal is a great organic amendment.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
https://www.gardeningknowhow.com/ornamental/flowers/cranesbill-geranium/growing-hardy-geraniums.htm