This morning while walking the dog around the ponds near our house, I heard a chorus of squeaks and peeps. The spring peepers are finally singing. This is late for them, but within the range of when peepers herald spring. Phenology — the study of nature signs — recommends that peas be planted when the spring peepers start singing. I planted mine yesterday. How about you? What have you planted? Do you use nature signs to determine when to put in your garden?