Leafcutter bees do not eat leaves. Adults feed on nectar from flowers, and females collect pollen to feed their young. The neat semicircles you see cut from rose, lilac or redbud leaves are used to line and seal nest cells, not as food.
What Adult Leafcutter Bees Eat
- Nectar: adults drink nectar from many flowers for energy.
- Pollen: females gather it on a brush of hairs under the abdomen, then pack it into nest cells.
They favor flowers in the daisy, pea and mint families, and they are especially good at pollinating legumes such as alfalfa and clover. Farmers in some regions manage them as crop pollinators.
What the Larvae Eat
Each female builds a row of cells inside a hollow stem, a beetle burrow or a bee hotel tube. She lines each cell with leaf pieces, fills it with a mixture of pollen and nectar, lays one egg on top and seals the cell with more leaf discs. The larva eats the provision, spins a cocoon and overwinters inside before emerging the next summer.
Why They Cut Leaves
The leaf pieces are building material. A single nest cell uses many round and oval pieces, and one female can cut hundreds in a season. Damage looks dramatic but rarely harms a healthy plant. If you want to keep your roses neat, live with a little cutting, since these bees are excellent pollinators.
Common Myths
- They eat wood or mortar: no. They use existing holes and do not chew wood.
- They are aggressive: no. They are gentle and rarely sting unless handled.
- They live in colonies: no. Each female nests alone.
How to Help Leafcutter Bees
- Plant lavender, coneflower, sunflower, clover, and herbs that bloom through summer.
- Keep a few old stems and untreated wood with small holes for nesting.
- Put up a bee hotel with tubes about 5/16 inch wide, and replace or clean it yearly to prevent disease and parasites.
- Avoid insecticides on blooming plants.
Bottom Line
Leafcutter bees sip nectar and stock their nests with pollen. The leaves are for nest building. For other bees see what solitary bees eat and what boring bees eat.
