Agriculture Reference
In-Depth Information
Celeriac
Celeriac, related to celery, is a root vegetable with a texture like potato and a
mild, celery-like taste. It is used raw in salads or cooked like potato, with which
it is often mixed. Celeriac needs a longer growth period than most vegetables and
many gardeners struggle to get worthwhile roots, particularly in northern parts
of Britain. The polytunnel not only stretches the growing season for celeriac but
also provides enough protection for it to be left in the ground right through the
winter, so that it is in perfect condition when it is needed.
Preparation
Like carrots, celeriac prefers a loose, well-drained soil that is not too high in
nitrogen, so as to encourage root development rather than lots of leaves. It will
do well in spots that had well-rotted manure or compost added during the previous
season.
Sowing
To give celeriac the longest growing season possible, it is best to sow it in modules
on a sunny windowsill indoors, or with some gentle heat in the tunnel, in
February or early March. The seeds are extremely tiny, so cover them with just
2-3mm of earth or alternatively leave them on the surface and cover the pot with
a plastic bag to conserve moisture. The root system of the seedlings is quite
extensive and likely to become a tangle, so thin to one plant per module as soon
as possible. This will mean less stress when you plant them out in mid-May.
Growing
Plant about 30cm apart in a sunny spot for the biggest roots, though celeriac
will also cope well with a partially shaded situation. Protect the young plants
from slugs, and take care not to let them dry out until they are well established.
As the roots develop, pull earth up to cover them more. This helps to keep wood-
lice out, and also helps the root to stay white. Feeding is not necessary in reason-
ably fertile soil.
Harvesting and storage
Celeriac can be harvested as soon as you think the roots are big enough, usually
from October onwards. They can be stored in the same ways as carrots and beets,
but in the polytunnel they are usually better just left in the ground until needed,
provided they are covered with fleece when heavy frost is expected.
