Why Have My Bean Seeds Been Dug Up and Eaten?

A row of freshly sown bean seeds that disappears entirely — with only small digging disturbances in the soil to mark where each seed was — has almost certainly been found and removed by mice. Wood mice and house mice have a remarkable ability to locate large, starchy seeds in the soil by smell, and bean seeds are among the most attractive targets in the vegetable garden. Unlike the underground damage from bean seed fly or seed rot, mouse-taken seeds leave no trace at the sowing site — dig to investigate and the holes are simply empty, with clean soil.

How mice find seeds so reliably

Mice have an acute sense of smell and can locate seeds buried up to 5 cm deep without difficulty. Freshly sown bean seeds — large, starchy, and nutrient-rich — are easily detected, especially in the days after sowing when the disturbed soil has a fresh, attractive smell. Mice typically work along a row systematically, digging out each seed with precision. They may carry seeds away or eat them at the digging site. The problem is worst in gardens with nearby hedgerows, sheds, compost heaps, or long grass that provide mouse habitat close to the vegetable plot.

Physical protection for direct-sown seeds

Covering the sown row with fine mesh, chicken wire, or a cloche immediately after sowing prevents mouse access until germination. Pegged flat chicken wire (2.5 cm mesh or smaller) laid directly on the soil surface over the row and extending 15 cm on each side is very effective — mice cannot dig through it but water passes freely. Remove when seedlings are 10–15 cm tall. A row of mouse traps set immediately alongside the sowing row, covered with a tile or large stone to exclude birds, is highly effective in high-pressure situations.

The transplanting option

The simplest long-term solution is to start beans in individual pots under cover and transplant 15 cm seedlings outdoors. Mice virtually never attack established plants and the seedlings grow away quickly without the vulnerability window of the germinating seed. This approach also avoids cold-soil germination problems and seed fly damage simultaneously — making it the recommended method for any gardener who has experienced repeated losses to mice or seed fly.