The Insect Nobody Invited

A garden looks like it consists of plants. It doesn’t. A garden is a machine with a lot of small moving parts, and some of the most important parts have wings.

Start with why a bee visits a flower at all. It isn’t there to help the plant. It’s there to eat, and to feed its young. Flowers make two foods: nectar, which is sugar water, and pollen, which is a yellow powder full of protein. The bee wants both, and the flower gives them away for free.

Here’s the trick. A bee’s body has one feature that changes everything: it is covered in fine hairs, and pollen sticks to hair. A bee that has spent a minute inside a flower comes out dusted in yellow. When it lands on the next flower of the same kind, some of that dust falls off in exactly the right place, and the plant can start making seeds. No pollen delivery, no apple. No apple, no apple tree.

That is the general function of a bee in a garden: it is a delivery service that has no idea it is working.

Not every bee does the job the same way. Honeybees live in huge groups and visit thousands of flowers a day, but most bee species in the world are solitary: one female, one small hole in a wall or in dead wood, no hive at all. And bumblebees can do something honeybees cannot. They hold on to a flower and shake their flight muscles until the pollen falls out, the way you shake salt out of a shaker. Tomato flowers need that shake. A garden with no bumblebees grows fewer tomatoes, and the gardener usually blames the weather.

Weather is a factor too, of course. So is what else is growing nearby, and whether anyone is spraying the leaves. An ecosystem is a list of factors, and pulling one out of the list changes all the others.

Which brings us to the insect nobody wants at the picnic table.

In August, a wasp is the least popular animal in the garden. But look at what it was doing in June. A wasp nest feeds its young on meat, and the meat it hunts is caterpillars, flies, and aphids — the small insects that spend the early summer eating the leaves of the vegetables. One nest can remove thousands of them in a season, for free, without being asked.

The wasp on your sandwich is not a visitor. It’s staff.