Garlic bulb splitting happens for two main reasons: late harvest and uneven watering. Both problems cause cloves to push apart and break through their outer wrapper layers. This ruins storage life and makes bulbs fall apart when you try to use them in the kitchen.
I found this out the hard way last summer when work kept me from my garden for a week. My garlic sat in the ground just seven days too long past the ideal time. When I dug them up, half the bulbs had split open with cloves poking through torn wrappers. They went bad within a month instead of lasting all winter long.
The reason why garlic splits often comes down to harvest timing. Penn State Extension warns that bulbs keep growing even after they reach full size. The cloves expand and push outward against wrapper layers that have started to dry out. Wait too long and those thin skins just give way under all the pressure.
Your leaves tell you when to harvest if you watch them close. Each green leaf on the plant matches one wrapper layer on the bulb below ground. When leaves die back, those wrappers lose their strength and start to break down. Dig your garlic with 4-5 green leaves still showing to keep enough protection around the cloves.
Uneven watering causes just as much damage as garlic harvest timing problems do. Long dry spells followed by heavy rain make cloves swell too fast. The sudden growth bursts wrapper layers that had started to dry and paper over. Keep soil moist but not soggy wet through the last month before harvest time.
Check your patch when 40-50% of leaves turn yellow or brown. Dig up one test bulb and cut it in half to see how the wrappers look inside. Tight, papery coverage with clear clove definition means harvest time has come. Loose or splitting wrappers mean you should dig the rest right away.
To prevent garlic splitting next year, mark your calendar for the harvest window based on your planting date. Most garlic takes 8-9 months from fall planting to summer harvest time. Stop watering about a week before you plan to dig your crop. This firms up the bulbs and helps wrappers cure in place.
Store any split bulbs in the front of your garlic stash and use them first in your cooking. They taste just as good but spoil faster than tight, whole bulbs with good wrapper coverage. Next year, start checking your crop earlier and dig at the first signs of wrapper papering to avoid this problem.
Read the full article: Growing Garlic Successfully in Any Climate
