What's your question? Ask

Simply store any freshly dug (unwashed) bulbs in a dark, dry place as soon as possible to dry out until ready to use.

There are many online sellers you can buy from or you should be able to buy it from a local plant nursery. If you like heirloom varieties, this is an excellent company to buy from:
http://www.greenmountaingarlic.com/

I, for one, do not understand your question. Are you talking about garlic chives or actual garlic stems? What kind of processing do you want to do?

This article will help: https://www.gardeningknowhow.com/edible/herbs/garlic/when-to-harvest-garlic.htm

While it is closer to a leek than a garlic, you plant and grow elephant garlic like regular garlic. Because of its size, spacing is different. Put the cloves 8-10 inches apart in rows 18-20 inches from each other. Set them 1-2 inches deep. Sometimes elephant garlic tends to produce only one large, solid bulb with no segments. If this occurs, replant and it will produce a bulb the next harvest with the more typical cloves. Planting usually takes place in fall, about 4-6 weeks before the first hard freeze in order to establish roots but it can also be spring planted. Harvest the garlic by pulling or digging when the tops turn brown and die down in summer. Store in a cool, dry place to prevent sprouting.

I would suggest you lay it out flat on layers of newspaper to allow it to dry in your utility room. A cool and dry area works best for hardening off your garlic. You can bundle and hang it when you get back.