The Watered Garden

A gardener watered the roses each morning.

One morning, he was interrupted and couldn't remember if he'd finished.

So he watered them again.

The roses, overwatered, developed root rot.

A gardener down the lane used a different method: she watered until the soil was moist, and stopped. If she forgot whether she'd watered, she checked the soil. Moist soil didn't get more water.