Ammis in Gorthleck

Ammi majus

Ammi
Ammi · 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.

90 cm · Full Sun · Moderate Water

Calibrated to Gorthleck · last frost ≈ 1 Jun

Sow April to May, plant out June, harvest August to September. Frost risk September to June.
ActivityJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember
SowNoNoNoYesYesNoNoNoNoNoNoNo
Plant outNoNoNoNoNoYesNoNoNoNoNoNo
HarvestNoNoNoNoNoNoNoYesYesNoNoNo

Growing guide

Step-by-step instructions for growing Ammi

  1. 01

    Sow Seeds

    17 Apr to 18 May

    Sow seeds thinly around 17th April - 18th May, just under deep in prepared soil. Keep the surface evenly moist while the seedlings establish, and protect early sowings from birds and slugs.

  2. 02

    Thin Seedlings

    16 May to 30 May

    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 16th May - 30th May.

  3. 03

    Plant Out

    15 Jun to 29 Jun

    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 15th June - 29th June.

  4. 04

    Support Plants

    22 Jun to 22 Jun

    From 22nd June, 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.

  5. 05

    Water and Feed

    6 Jul to 26 Sept

    From 6th July to 26th September, 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.

  6. 06

    Cut Flowers

    21 Aug to 26 Sept

    Cut stems from 21st August as soon as the flower heads open and keep picking through 26th September. Regular cutting encourages more stems, and the flowers last best if you cut early in the day and put them straight into water.

Companion plants

Tap a plant to see why it works (or doesn't) with Ammi.

Good companions

Plants to avoid

Why companion planting matters

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.

Ammi guides by town

See how Ammi timing shifts in other towns with different frost dates.