Bronze Fennel

Foeniculum vulgare 'Purpureum' Bronze Fennel

Tall, smoky purple-bronze clouds of finely-divided, almost-feathered foliage above an upright stem topped in late summer with flat umbels of mustard-yellow flowers — Bronze Fennel is the architectural herb that earns its place in the cottage border on looks alone, and rewards you with edible leaves, edible seeds and exceptional value for pollinators.

This is the dark-leaved form of the familiar culinary fennel, and it is one of the most architecturally beautiful plants you can grow from seed. The foliage is so finely divided that it reads almost like a haze of smoky purple-bronze mist hovering at 1.2–1.5m, and the flat-topped umbels of yellow flowers in late summer attract bees, hoverflies and beneficial predatory insects in genuine numbers. Bronze fennel is a hardy perennial and deer- and rabbit-resistant. The leaves taste sweetly of aniseed and are a classic culinary pairing for fish; the seeds are the same fennel seeds you buy as spice. Self-seeds enthusiastically once established, so deadhead before seed-set if you want to control its spread.

A note on growing

Sow direct outdoors from March to May. Bronze fennel develops a long taproot and resents transplanting, so direct sowing where plants are to grow produces the strongest results. Sow at 1cm depth in lean, well-drained soil; rich ground produces lush foliage but fewer flowers. Full sun. Germination takes 10–14 days. Thin seedlings to 45cm spacing. Important note for kitchen gardens: do not plant fennel near coriander or dill — fennel is famously antagonistic to other umbellifers and inhibits their growth. Also a poor companion for tomatoes. It is, however, an excellent companion to most non-umbellifer plants and a magnet for beneficial insects in the vegetable garden.

Where it shines

In cottage borders as a tall, architectural backdrop — the smoky bronze foliage provides foil for almost any colour planted in front of it, and the height makes it ideal for the back of the border. In wildlife and pollinator gardens, where the late-summer flowers attract beneficial predators that help control aphids and other pests. In the kitchen, where the leaves, stems and seeds are all edible and quietly distinctive. As a cut flower, the airy foliage and yellow umbels make beautiful additions to summer bouquets.

Plant alongside

For dramatic foliage contrast in the cottage border, combine Bronze Fennel with the silver leaves of Lychnis coronaria, the hot pink of Achillea 'Cerise Queen' and the soft cream of Calendula 'Art Shades Mixed' — the smoky bronze haze pulls the colour scheme together beautifully. For cutting, pair with the architectural form of Bells of Ireland and the airy lime green of Bupleurum 'Griffithii'.