Years ago I bought a clump of garlic chives. They were cheap and to my delight they flourished and multiplied. Soon I had the inspired idea to make decorative Vs of them in four of my herb garden beds.
The leaves are delicious in salads or vinegars and the flowers are lovely and also edible.
But, alas, all too soon the flowers go to seed and I have learned through bitter experience that, left to their own devices, the garlic chives would choke out every other herb. So as soon as the flowers begin to be replaced by knobby green seed heads, I ruthlessly cut down those pretty flowers and compost them.
It took a while but I have finally learned that a garden catalog's "hardy" or "spreads rapidly" is code for "INVASIVE - BEWARE!"