Plant alliums for more flavour

From the papery-skinned onion that anchors a winter stew to the feathery chives that lift a simple omelette, alliums are the quiet workhorses of the edible garden. Some demand patience and planning, taking a full season to swell and sweeten, while others race from seed to plate in a matter of weeks. Together, they offer gardeners a year filled with flavour.

What is an allium?

Alliums belong to the genus Allium in the Amaryllidaceae family and are defined by their sulphur-rich compounds and unmistakable aroma. That familiar scent is a chemical defence, evolved to deter insects and grazing animals and to suppress harmful fungi and bacteria.

With more than 900 species there is some diversity among them, but alliums typically have narrow leaves, a bulb or thickened stem and a starry flower head known as an umbel.

Preparing for your plants

Soil preparation sets the tone for the entire season, and the following is worth noting:

• Alliums are shallow-rooted plants and dislike competition and waterlogging, but they do thrive on steady moisture and balanced nutrition. A friable, well-drained soil enriched with compost and well-rotted manure is ideal.
• Aim for a slightly acidic pH and consider adding a light dusting of rock minerals, wood ash or seaweed meal to supply potassium, which supports strong bulb development.
• Crop rotation is essential with alliums. Growing them in the same bed year after year invites a build-up of soil-borne pests and diseases. A three to four year break, ideally following legumes or leafy crops and avoiding recently planted allium beds, helps keep many problems at bay.

The best of both worlds

Growing both slow and fast alliums offers more than a continuous harvest; it builds an understanding of season, soil and timing. The bulb builders teach patience and planning, while the green sprinters reward enthusiasm and spontaneity. Together, they form a genus that is as generous as it is diverse, offering something for every climate, every space and every gardener.

You can read Marcelle Nankervis’s full article about growing alliums in our Autumn 2026 issue. She even gives a list of the pests to keep an eye out for! You’ll find it in newsagents and selected supermarkets. Or you can subscribe here to get an issue delivered to your door!