From a plant's perspective, our greatest allies are those who help us fend off pests without harsh chemicals. We, chrysanthemums, contain pyrethrins, compounds that naturally repel many insects. However, we still benefit from strategic neighbors. Aromatic herbs like lavender (Lavandula) and rosemary (Salvia rosmarinus) are excellent companions. Their strong scent acts as a natural pest deterrent, confusing and repelling insects like aphids that might otherwise bother us. Similarly, the pungent aroma of garlic and ornamental alliums can mask our scent from browsing pests, creating a protective barrier. This symbiotic relationship allows us all to thrive with less stress from insect damage.
Our growth habit and bloom time are key considerations. We often have a dense, mounding form and produce a spectacular but concentrated burst of color in late summer and autumn. To create a visually pleasing garden bed, we appreciate companions that provide contrasting forms and extended interest. Ornamental grasses, such as Fountain Grass (Pennisetum) or Feather Reed Grass (Calamagrostis), offer a beautiful textural contrast with their wispy, upright plumes that sway in the wind, complementing our more rigid, floral structure. For vertical accents, the sturdy spikes of Russian Sage (Perovskia atriplicifolia) or Joe-Pye Weed (Eutrochium) add height and an airy quality behind us, preventing the border from looking flat.
A good companion understands the rhythm of the seasons. Our most glorious display comes late in the year. Therefore, we value neighbors that carry the visual load earlier in the season. Spring-flowering bulbs, such as tulips or daffodils, are perfect as they complete their lifecycle and go dormant just as we begin our vigorous growth, avoiding any competition for space or sunlight. Low-growing, shallow-rooted ground covers like Creeping Phlox (Phlox subulata) or Ajuga help us by shading the soil, conserving moisture, and suppressing weeds that would otherwise compete with our roots for water and nutrients. This creates a living mulch that keeps our root zone cool and healthy.
Not all plants make good neighbors. We have specific needs for well-drained soil and full sun, and we dislike having wet feet. It is best to avoid planting us with species that require constant moisture or heavy shade, such as many ferns or impatiens, as this would create an environment prone to root rot and fungal diseases that could affect us both. Furthermore, while we are heavy feeders, extremely aggressive spreaders with invasive root systems can outcompete us for resources. We prefer companions that respect our space and growing conditions.
