We all insist on crushing the big white grubs we find in the compost in August, when this one detail on their head tells you which ones to leave alone

We all insist on crushing the big white grubs we find in the compost in August, when this one detail on their head tells y...

Every August, gardeners instinctively squash the fat white grubs they find in compost—but many of these larvae are actually beneficial decomposers. A single detail on the grub’s head tells you instantly whether to leave it alone or remove it before spreading compost.