The key to perfect garlic harvest timing is watching your leaves turn from green to brown. Harvest when 40-60% of leaves have browned but at least 4 green leaves still remain on each plant. This balance gives you full-sized bulbs with enough wrapper protection for storage.
I learned this lesson the hard way my second year growing garlic in my backyard. I waited until almost every leaf had turned brown, thinking bigger was better. When I dug those bulbs up, the wrappers had worn away and cloves were poking out. They went bad within six weeks instead of lasting through winter like they should have.
The link between leaves and wrappers tells you when to harvest garlic with the best results. Each green leaf on the plant above ground matches one wrapper layer on the bulb below. Garlic leaves turning brown means those wrapper layers are drying out. Too few green leaves left means too few wrappers to protect your crop in storage.
Penn State and MSU Extension experts both say to harvest with at least 4-5 partly green leaves still showing on your plants. This window occurs from mid-June to mid-July in most growing regions of the country. Your exact timing depends on when you planted and what variety you chose to grow that season.
Watch for these garlic harvest indicators as summer approaches each year. Lower leaves die back first while top leaves stay green the longest. The whole plant starts to look less perky and begins to lean over a bit. Scape removal on hardneck types should have happened about two weeks before harvest time.
Test dig one bulb before you harvest the whole patch to check your timing. Use a garden fork or trowel to lift a single plant without cutting into the bulb below. Check that wrappers look papery and intact with clear clove definition showing through. If the wrappers seem thin or cloves poke through, dig the rest right away.
The test bulb also shows you the bulb size so you know if more growing time would help. Small bulbs with tight wrappers can stay in the ground another week or so. Large bulbs with loose wrappers need to come out now before they split open underground and ruin your storage plans.
Dig on a dry day if you can wait for good weather in your area. Wet soil clings to bulbs and makes curing harder later on. Loosen soil around each plant before you pull to avoid breaking the stem where it meets the bulb. That stem helps with curing and hanging your garlic to dry.
Read the full article: Growing Garlic Successfully in Any Climate
