Garden guides six plants lure helpful insects

Home gardeners looking for natural pest control often turn to planting strategies that draw beneficial insects, a practice supported by research and practical experience.

How Flowers Boost Parasite Activity

A 2005 study conducted at the University of Illinois found that shrubs infested with bagworms showed a 71 percent higher rate of parasitism when surrounded by flowering plants. The presence of blossoms appears to give predatory insects a reliable food source, encouraging them to linger near vulnerable pests.

While commercial predatory insects are available, cultivating nectar‑rich flowers tends to be a simpler way to sustain populations of lady beetles, hoverflies, and certain wasps. For instance, peonies can attract adult tiphia wasps, which then lay eggs on nearby Japanese and Oriental beetles. The resulting larvae, along with those of hoverflies and lady beetles, frequently devour aphids, plant hoppers, caterpillars, and other garden threats.

Six Plants That Invite Helpful Bugs

Choosing the right plants can create a steady supply of pollen and nectar, ensuring that beneficial insects have the resources they need throughout the season. Below are six species noted for their ability to attract a range of predator insects.

Cosmos – Tender perennials that grow 3‑5 ft tall, producing airy yellow flowers from summer to early fall. They serve as host plants for swallowtail butterflies and draw lady beetles, lacewings, and ichneumon wasps.
Goldenrod (Solidago spp.) – Blooms of plumed spikes appear from late summer to fall. Plants range from 1 to 6 ft in height and attract hoverflies and leatherwing soldier beetles.
Phlox – Single or double blossoms in pink, white, purple, yellow, or red emerge early to late spring. The species thrives in USDA zones 3‑8 and is known to lure tiphia wasps.
Pot marigold (Calendula officinalis) – Daisy‑shaped flowers in shades of yellow, orange, pink, peach, cream, or bronze bloom from late spring until frost. They are a magnet for lady beetles and hoverflies.
Queen Anne’s lace (Daucus carota) – White summer flowers grow 3‑4 ft tall. Though the plant’s sap can be toxic, it draws hoverflies, lacewings, and lady beetles.
Sweet alyssum (Lobularia maritima) – Often treated as an annual, this low‑growing plant forms clusters of white, purple, or lavender flowers from late spring to frost, appealing especially to hoverflies.

All listed species are hardy across a range of USDA zones, making them adaptable to many garden climates. Their modest size and extended bloom periods help maintain a continuous food supply for insect allies.

Beyond planting, gardeners should remember that beneficial insects also need water.

Water is essential.

Adding a few stones to a birdbath creates shallow spots where insects can safely drink without risking drowning.

Flower shape matters, too. Many beneficial insects have short mouthparts, so umbel‑shaped and daisy‑shaped blossoms are easier for them to access. Selecting plants with these forms can improve feeding efficiency and support larger insect populations.

While larvae are the primary predators of garden pests, adult insects often have brief lifespans and must find nectar at precise times to reproduce. Providing overlapping bloom periods helps bridge any gaps in food availability.

One practical concern is timing. If a gardener plants only early‑season flowers, later‑season pests may find fewer allies. Staggering plantings ensures that blooming extends from spring through fall, offering consistent support for beneficial bugs.

Continuing the use of integrated pest management (IPM) practices—such as monitoring pest levels, encouraging natural predators, and limiting chemical interventions—remains a sensible approach. The inclusion of the six listed plants fits well within an IPM framework, providing both aesthetic value and functional pest suppression.

For official guidance on plant hardiness, the USDA’s plant hardiness zone map offers detailed regional information here.

By integrating these flowering species and taking simple steps like adding insect‑friendly water features, gardeners can create an environment where beneficial insects thrive, reducing reliance on synthetic pesticides and promoting a healthier garden ecosystem.