Clean blossoms. Be sure they're free of insects, dirt, and debris; wash/rinse if necessary.
Place blossoms (except the few saved for garnish), water, wine, and vinegar in a pot and bring to a boil. Simmer for twenty minutes, stirring regularly.
Strain to separate blossoms from liquid. Leave to drip for 1-2 hours. Discard solids. Let liquid cool to room temperature.
Measure sugar and put aside so it can be added quickly when needed. Prepare canning jars by ensuring they are clean and warm. Pick petals off the saved chive blossoms and drop into the jars. When jelly is added later, the petals will float to the top and be part of the jelly.
Put three cups of liquid in a large pot. A larger pot is necessary as the jelly will foam up in the next few steps. Whisk in powdered pectin until it dissolves.
Bring to a boil. Whisk in sugar and return to a boil. Boil hard for one minute, stirring constantly.
Working quickly, remove pot from heat and skim off any foam. Immediately ladle into the jars, leaving a ¼ inch headspace. Wipe rims. Put on lid and screw to fingertip tightness. Place jars in canner and cover with an inch of water.
Process in canner for ten minutes. The ten minute timer starts when the water is brought to a full boil.
Remove canner from heat and let sit for five minutes. Carefully remove jars using a jar lifter. Let sit undisturbed on the counter overnight.
In the morning, test if lids have "popped" — they bend downward, indicating a seal was made. Sealed jars can be stored in a cool dry place. Unsealed jars (ones that did not "pop") should be refrigerated and consumed first.