
Ammi majus
A hardy annual grown in the UK for airy white flowers and good cutting stems. Sow in spring for a summer display in borders and cutting patches, or try an autumn sowing in mild areas for stronger plants.
Step-by-step instructions for growing Ammi
Sow seeds thinly around 13th February - 16th March, just under deep in prepared soil. Keep the surface evenly moist while the seedlings establish, and protect early sowings from birds and slugs.
When seedlings are large enough to handle, thin them to apart so each plant has room to branch. Keep the strongest plants and remove the weaker ones cleanly around 14th March - 28th March.
Set young plants into their final position once they are sturdy, spacing them apart. Water in thoroughly straight after planting, then use fleece if a cold snap is forecast around 13th April - 27th April.
From 20th April, add light stakes or mesh if the plants start to lean. Ammi can flop in exposed spots after rain, so put support in early rather than waiting for stems to bend.
From 4th May to 20th November, water during dry spells and give a light balanced liquid feed once at the start of flowering if the soil is poor. Avoid overfeeding, as soft growth makes stems weak and floppy.
Cut stems from 19th June as soon as the flower heads open and keep picking through 20th November. Regular cutting encourages more stems, and the flowers last best if you cut early in the day and put them straight into water.
Tap a plant to see why it works (or doesn't) with Ammi.
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.
See how Ammi timing shifts in other towns with different frost dates.