What Are the Best Companion Plants for Roses?

Roses are beautiful but demanding — they are prone to aphids on new growth, blackspot and mildew on their leaves, and they need pollinators for those who grow fruiting varieties. Companion planting for roses is well established in traditional cottage gardening, and several pairings have genuine evidence behind them. The goal is to reduce pest pressure, improve air circulation around the plants, and attract the beneficial insects that keep aphid populations under control.

Garlic and Chives — the Classic Rose Companions

Garlic planted at the base of rose bushes is one of the oldest companion planting combinations in European gardens. The sulphur compounds in garlic are fungicidal and there is some evidence they reduce the incidence of blackspot when garlic is planted densely around the base of the plant. Chives work similarly — their purple flowers also attract beneficial insects and they are less aggressive about taking space than garlic. Plant several chive clumps around each rose rather than a single plant, as the effect depends on the concentration of aromatic compounds in the air around the foliage.

Lavender for Aphid Deterrence and Pollinator Support

Lavender planted alongside roses creates an aromatic environment that appears to deter aphids. More importantly, lavender's long flowering season brings in enormous numbers of bees and other pollinators that also visit the roses. Lacewings and ladybirds — both significant aphid predators — are frequent visitors to lavender. The visual contrast between lavender's blue-purple spikes and rose flowers is also beautiful, making this a companion pairing that works aesthetically as well as ecologically.

Catmint as a Ground Cover Companion

Catmint (Nepeta) is a traditional rose companion in British cottage gardens. It forms a dense mound at the feet of rose bushes, covering the soil, deterring weeds, and producing a long succession of blue flowers that attract pollinators and beneficial insects from spring through to autumn. Catmint's soft aromatic foliage is thought to deter aphids. It also helps disguise the bare, often leggy lower stems of tall rose varieties. Cut it back hard in midsummer and it will flush again with new growth and flowers in time for the second rose flush.

Alliums for Structural and Biological Contrast

Ornamental alliums — the ball-shaped purple-flowered relatives of onion and garlic — are superb rose companions. Their flowers appear in late spring to early summer, bridging the gap before the main rose flush, and their tall structural forms contrast beautifully with rose foliage. Biologically they release the same sulphur compounds as garlic and chives, deterring fungal disease and aphids. Allium hollandicum, A. cristophii, and A. 'Purple Sensation' are all good choices that naturalise well under roses.

What to Avoid Near Roses

Fennel inhibits most plants and should be kept far from roses. Avoid planting tall brassicas too close to rose beds — they tend to harbour the same aphid species that attacks roses and they create conditions where aphid populations can swell and migrate. Do not plant anything in the rose bed that requires frequent digging around the roots — roses have surface-feeding roots that are easily damaged. Low-growing, well-behaved companions that stay put are preferable.