Trap Crops in Small Gardens

What is a trap crop?

A trap crop is a plant grown to attract a pest away from a more valuable crop. It works when the pest strongly prefers the trap plant for feeding or egg laying. The pests gather there and you remove or destroy them, instead of treating the whole garden.

The idea is simple but success depends on the details: the right trap plant, in the right place, at the right time, with a plan for what happens to the pests once they gather.

In a small garden, a trap crop is easiest to try with pests that are strongly drawn to a particular plant family, and where you can reach the trap daily to remove them.

Does it work in a small garden?

Results are mixed. Research on trap crops shows success in some cases and little benefit in others, and small plots add challenges because pests can reach the main crop easily from a nearby trap. A trap crop is not a substitute for other measures. Treat it as an extra layer.

Ask your extension office whether a trap crop is recommended for the pest you are facing in your region. Local pest biology matters, and what helps in one area may not in another.

How do you choose the trap plant?

Pick a plant the target pest finds more attractive than your crop, and that grows well in your conditions. It should be ready at the time the pest arrives, which often means planting earlier than the main crop. Check with your extension office or published research on pairings that have been tested.

Consider the risks. A trap plant can also host other pests or disease, and some can become weedy. Choose a species that is easy to manage and remove.

• Match the trap plant to a specific pest.
• Plant it before or at the same time as the main crop.
• Check that it will not become a weed.
• Think about what else it might attract.

Where should you put it?

Placement depends on how the pest moves. A border around the main crop can intercept pests entering from outside, and a trap planted at the edge of the garden, upwind or on the side the pests come from, may draw them before they reach the crop. In some cases, spots well away from the main crop work better, to keep pests from moving over.

Watch where pests first appear in your garden and use your records from earlier seasons to guide placement.

What do you do with the pests once they gather?

A trap crop is only a concentration point. If you leave the pests alone, they build up and move on to the main crop. Check the trap often and remove the pests by hand, or remove and dispose of the infested plants before the pests mature, according to your extension office's advice.

Do not leave heavily infested plants in the garden or compost pile, since pests may survive there. If you consider a pesticide on a trap crop, the label is the law, and the choice should come from your extension office.

Time removal to the life cycle. Remove trap plants before the pests mature and leave, or the trap will release them to your main crop.

What can go wrong?

The most common problem is that the trap crop becomes a nursery. It grows a large pest population that spills over to the main crop when the trap plants age or are cut. Timing mistakes, a trap planted too close, or neglect of the trap all cause this.

Another problem is that the trap crop competes for space, water and nutrients in a small garden. Plan the space carefully and be ready to remove it if it is not working.

How do you test a trap crop and keep records?

Try it on a small scale first, and compare a protected bed with an unprotected one if you can. Record the planting date, pest numbers, damage and what you did. After a season or two you will know whether it pays off in your garden.

Combine the trap crop with other measures, such as row cover, rotation, healthy soil and habitat for beneficial insects, for a more dependable result.

Share results with your extension office or local gardeners. Local reports on what has worked help everyone choose better. Be honest in your records about failures. A trap crop that did not help is useful information, since it keeps you from repeating the same plan and points toward other measures such as row cover or a change in planting date.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.