What varieties are you growing? Some tend to crack more than others.
Uneven watering can also cause some varieties to crack. And if your
summer has been anything like our summer (very hot!) you can expect a
few to crack.
Check that you are watering them regularly with the same amount of
water each time as this is probably due to irregular watering from
letting them dry out a bit much and then watering them a bit too much
What the other two people said about extremes of moisture vs dryness is
right. Beside watering regularly and evenly, which involves work, you should
also mulch the plants, which helps minimize rapid drying. If you have not
poisoned your lawn with weed killers & pesticides, and if you mower has a
bagging attachment, you have a free source of excellent mulch.
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