Dahlia Companion Plants – Companion Flowers That Complement Dahlia Plants

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Image by Mirjam Reither

By Bonnie L. Grant

There is absolutely nothing like a big bed of dahlia flowers. The blooms come in many colors and sizes, giving any gardener’s taste an outlet. When planning your bed, it’s a good idea to consider what to plant with dahlias. Dahlia companion plants can be the perfect accents to set off the flowers but may also aid in deterring pests or even act as a decoy and sacrifice themselves to insect predators. There are many flowers that complement dahlia and do double duty to prevent pests.

Dahlia Companion Plants

Dahlias grow from tubers and produce flowers that range in size from dinner plate giants to diminutive discs. Dahlias are perennials and work well in a mixed perennial bed. Consider the huge water needs of these plants when selecting companions for dahlia. Plants can also grow several feet tall and nearly as wide. Lower plants should be able to tolerate some shade and taller plants can be used at the rear of the bed as an accent.

Herbs and Flowers that Complement Dahlia

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Choose plants that assist dahlias by repelling pests so the garden bed is free of insects and dahlia health is protected. Herbs are often good choices, as many of them have pungent scents and oils which seem to deter pests.

Annuals and perennials can coexist peacefully in an ornamental dahlia bed.

  • Nasturtiums are notoriously riotous growers with fiery colorful blooms and repellent properties. You can even eat the spicy flowers.
  • Salvia, or flowering sage, produces bright spikes of color which are magnets for pollinators like butterflies and moths.
  • Similarly a large clump of Monarda, or bee balm, will bring bees buzzing around the flowers.
  • Geraniums have a slightly unpleasant smell but unparalleled flowers in the garden and are toxic to aphids, but attract Japanese beetles in a self-sacrifice that can spare the dahlias.
  • Try mixing in old-fashioned bloomers like roses, peony, and lilies for ageless elegance.

As you choose other perennial companions for dahlia, remember to check the size of your plants. Since most dahlia form large bushes, taller plants will set them off nicely if installed as a backdrop. Towering joe pye weed, butterfly bush, and agapanthus are excellent vertical choices to brighten up the background of dahlias.

Sunflowers seek sun’s warmth as much as dahlias and will thrive in the same garden bed, adding their cheery faces as part of the area’s charm. Helenium, marguerite daisies, and goldenrod are other taller plants to add height.

Tumble a scattering of annuals in the front of the tubers such as petunia, marigold, ageratum and bacopa to add a rainbow of color while pulling the whole effect together.

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