I assiduously dig up grape hyacinths, they were taking over the garden. After digging out as many clumps as possible, I have since been going round in the autumn/winter when they first stick leaves out and digging up any I see before they can flower and when other plants are dormant or cut right back.
The one thing I do not do, is dispose of them on site. Clumps get taken to the tip, odd ones get put in with the food waste for anaroebic digestion to make make gas to be fed into the mains or converted to electricity. But never on the compost heap.