Cultivation notes Site and
soil Choose an open, sunny site and well-drained soil. High humidity around the
foliage and wet soils make the crop more prone to disease, particularly if
planted in the autumn. Garlic does not thrive on acid soils (below pH 6.5).
Reduce acidity by applying lime in autumn and winter. Prior to planting,
improve the soil’s structure, moisture retention and nutrient levels by
incorporating organic matter. Apply about two bucketfuls of well-rotted manure
or other organic matter such as garden compost every square metre (yard). Avoid
using fresh manure. Little fertiliser is required at planting. On average soils
apply a balanced fertiliser such as Growmore at 25g per sq m (1oz per sq
yd). Where organic matter was not applied, double the amount of
fertiliser.Planting in the openAfter planting, garlic needs a cool, one- to
two-month period at temperatures of 0-10°C (32-50°F) for good bulb development.
Planting in late autumn (late October to November) or in early spring
(depending on the cultivar) will provide the necessary chilling period.
Garlic is planted from bulb
segments (cloves), so break up the bulb carefully into individual segments
prior to planting
Make sure that the cloves
are planted the right way up: the flatter basal plate should be facing
downwards
Allow 15cm (6in) between
individual cloves and 30cm (1ft) between rows. Plant the cloves so the tips are
2.5cm (1in) below soil surface
Deeper planting can encourage better yields on light
soils, but do not plant deeply on heavy soils
Planting in modulesOn heavy,
wet soils garlic is best started off in modules in the autumn, overwintered in
a cold frame and planted out in the spring.
Partly fill the cells of a module-tray with
multi-purpose or soil-based compost
Insert the cloves individually into the cells and
cover with compost
Keep in a cool place – a well ventilated cold
frame is ideal – to provide protection from the harshest winter weather
Make sure that the compost is moist but not wet
Plant out in spring
AftercareAs the foliage of
garlic casts little shade, the crop can be easily swamped by weeds, which would
negatively affect the plants’ growth and subsequent yields. Hand weed
regularly. Hoeing can be tricky as the foliage and top of the bulb is easily
damaged. To avoid this, consider planting through black plastic sheeting to
suppress weeds.Water every 14 days during prolonged spells of dry weather.
Cease watering when the foliage begins to go yellow indicating onset of
maturity. Try to avoid overhead irrigation that encourages fungal diseases.
Harvesting Lift the bulbs with a fork once the foliage starts to fade and go
yellow. Avoid bruising the bulbs as it reduces their storage quality. Dry them
off thoroughly in a single layer in the sun or in a dry, well-ventilated place
such as a shed. Store in a dry place at 5-10°C (41-50°F).Harvest
autumn-planted garlic in early summer and spring-planted from mid-summer to
early autumn. Propagation It is best to obtain bulbs from a garden centre or
mail order suppliers. Garlic bought from a supermarket may not be suitable for UK climate and can carry diseases and viruses. Cultivar
Selection It is a common misconception that garlic bulbs are always white. The
tunics, as well as the cloves, often come with tinges of pink, red, purple or
brown. Garlic cultivars are split into two main groups – hardneck and
softneck.Hardneck garlic is a group of cultivars selected from
Allium sativum var. ophioscorodon originating from climates
with colder winters. It has the following characteristics:
Flower stalks appear readily
Fewer, larger cloves covered with a looser tunic areproduced
It is considered to have stronger and more interesting
lavour
It is best gathered when the foliage has changed
colour
It stores only until mid-winter
Softneck garlic (Allium sativum) generally produces smaller,
more tightly-packet cloves;
Does not produce flower stalks unless stressed
It is best harvested when the foliage starts going
over
It has better storage qualities than hardneck
varieties
If autumn planted it will keep until mid- to
late-winter
If planted in early spring softneck varieties it can
be stored until mid-spring
Hardneck varieties:‘Chesnok
Wight’: Good cropper, early summer maturing cultivar, skin and cloves
with deep purple veining, strong flavour. ‘Lautrec Wight’: Maturing in early summer, suitable for both
autumn and early spring planting, does not perform well on heavier soils and
cold areas. Considered to be one of the best flavoured cultivars. ‘Red Sicilian’: Early summer maturing, spicy flavour, good for
roasting.Softneck varieties:‘Early Wight’: Early maturing; can
be harvested at end of May from autumn planting, best used soon after harvest as
it is not good for storage. ‘Solent Wight’:
Late summer maturing, very good for storage. ‘Germidour’: Late maturing, purple skinned cloves. ‘Purple Heritage Moldovan’ or ‘Purple Moldovan’: Late
maturing, heirloom cultivar, producing large purple cloves.Elephant
garlic– Allium ampeloprasum – is often sold as garlic, but
it actually more closely related to leeks. It produces a small number of very
large cloves of mild flavour. It needs good, long, warm growing season to grow
well. It is best planted in October. The cloves sometimes do not divide,
producing just slightly larger single-clove (solo) bulbs. Early planting often
reduces the occurrence of solo bulbs. The single-clove bulb can be harvested or
planted again the following season, when it will often produce segmented
cloves.LinkAGM fruit and vegetables Problems Garlic suffers from similar pest
and disease problems as onions and leeks.When garlic is exposed to adverse
weather condition, such as fluctuating temperatures in spring, the plants may
produce garlic cloves above the ground in the stem. They are sometimes called top
sets, which can be used in the normal way. There nothing that can be
done about it. Hardneck garlic cultivars readily produce flower stalks.
The developing flowers should be removed as soon as they appear and can be used
for stir fries. Softneck cultivars occasionally produce flower stalk if exposed
to adverse growing conditions such as high temperatures or drought.If the bulbs
start splitting the crop was harvested too late.Shallow planting and
late harvesting can lead to some of the cloves going green.
They can be used as normal, but they are unlikely to store well.There are a
few fungal diseases to watch out for;
If the foliage develops orange pustules the crop may
be affected by leek rust, that garlic is very susceptible to
Withering of the foliage in dry weather may be a sign
of onion white rot. The base of the bulbs and roots develops white fluffy mould
Onions and shallots are very susceptible to downy
mildew, when the leaves start turning yellow and die off from the tip
downwards. In wet weather white mould develops on dead parts often turning
darker colour later. However, garlic seems to be seldom affected
Two leaf mining pests
that can cause damage to the foliage of garlic and other members of the Allium
family are the allium leaf-mining fly and leek moth.