Start a water bath canner and bring it to a boil.
Trim both ends of the scapes. You should remove the blossoms (keep them for another use) them cut off the tough bottom end.
Begin with one scape and trim it to the size of your jar, allowing just over ½ inch of headspace. This scape is now your measuring stick; use it to trim the rest of the scapes to the same length.
Pack the scapes into your mason jars then add 1 teaspoon of dill seed and ½ teaspoon of peppercorns and coriander seed to each jar.
Optional: If you want a spicy punch to your pickles, add ¼ to ½ teaspoon red pepper flakes.
Mix the water, apple cider vinegar, and salt in a pot and bring them to a boil while stirring to dissolve the salt.
Pour the hot vinegar brine over the garlic scapes in the mason jars, filling to within ½ inch of the top rim.
Seal with canning lids and process the jars in a water bath canner: 10 minutes for pint jars and 15 minutes for pint-and-a-half or quart jars.
Wait at least 2 weeks before eating so the flavors get to deeply infuse before eating. Better yet, try to be patient and for 6 weeks.