Monarch
A reliable selection with smooth, round roots and good standing power in the ground.
When to plant Celeriac in Cardiff
Apium graveolens var. rapaceum
A slow-growing root crop for deep, fertile, moisture-retentive soil. In the UK, sow under cover, plant out after frost risk has passed, and keep plants evenly watered. Lift roots from autumn onwards, leaving sound roots in the ground into winter where the soil stays workable.
40 cm · Full Sun · High Water
Calibrated to Cardiff · average last frost around 22 Apr
| Activity | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow indoors | No | Yes | Yes | No | No | No | No | No | No | No | No | No |
| Harvest | No | No | No | No | No | No | No | No | Yes | Yes | Yes | Yes |
Growing guide
What to do through the growing season
01
Prepare the Bed
8 Apr to 29 AprWork the soil deeply and break it down to a fine tilth around 8th April - 29th April. Remove stones and any hard lumps, then mix in well-rotted compost. Avoid fresh manure, because it makes the roots fork.
02
Sow Seeds Indoors
20 Feb to 11 MarSow seeds thinly on the surface of moist seed compost around 20th February - 11th March and cover with a light dusting of vermiculite. Keep them at in bright light and keep the compost evenly moist.
03
Prick Out Seedlings
13 Mar to 15 Apr Dates as each sowing reaches this stageWhen seedlings are large enough to handle, prick them out from 13th March - 15th April into individual small pots or modules. Handle them by the leaves and keep the young plants in bright light with evenly moist compost.
04
Harden Off and Plant Out
6 May to 20 MayHarden plants off for 7 to 10 days, then plant out around 6th May - 20th May after frost risk has passed. Space plants apart with the crown at soil level. Water in thoroughly and keep the soil evenly moist.
05
Harvest Roots
11 Sept to 2 Dec Dates as each sowing reaches this stageLift roots from 11th September and keep harvesting through 2nd December. Leave sound roots in the ground over winter if the soil drains well, then lift them as needed before they start to run down.
Suggested varieties
Popular varieties of Celeriac to consider
Asterix
Produces firm roots with a neat shape and steady performance in the vegetable patch.
Giant Prague
A long-established type that gives large, usable roots and is widely grown in Britain.
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Celeriac guides by town
See how Celeriac timing shifts in other towns with different frost dates.