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Onions and Garlic are well suited to growing in
cool climates, and, if grown correctly, and if you choose the right
varieties, can be stored for many months.
The best time to plant these vegetables is after
the Winter Solstice (shortest day of the year), which is in December
(around the 23rd) in the northern hemisphere and June (around the 23rd)
in the southern hemisphere. Although in cold climates such as those in
Northern Europe onions are often grown "over winter" - basically they
are planted in autumn and harvested in mid-summer, just so they can get
a bit more growth on the plants before the days lengthen and the bulbs
form.
In sub-tropical climates days might not be long
enough in summer for many varieties of onion to form bulbs, so seed is
best obtained from local growers - as it is for all plants - though ,
of course, there is always room for experimentation. If you don't
succeed the first time, try, try again.
Onions and garlic grow best in an open sunny
position in well-drained sandy and limy soils, and most sources suggest
that fresh manure should not be used on the growing plants probably
because this would encourage the bulbs to rot. In a rotation they are
probably best grown after a "heavy feeder" like tomatoes, corn, or
zucchini, which is good since all these plants, in cooler climates at
least, will have finished being productive by the middle of winter.
They should not be planted before or after legumes such as beans and
peas. A good sample of a rotation might be beans and peas, tomatoes
then garlic + onions, then salad or leafy vegetables, then back to
beans and peas.
Be aware thought that they take a while to mature and they may not be
ready to harvest until well into summer, or even autumn in cooler
climates.
Having said that though, they are really worth
growing, especially garlic, which takes up very little space. In a
small backyard last year I was easily able to grow enough garlic for
personal use (almost every day) for 6-7 months, and the garlic was of a
much stronger flavour and kept better than any I have ever bought.

Garlic is always propagated by planting the
individuals bulbs, each bulb then grows and forms a clump of between
ten and twenty more bulbs which can be harvested after the green tops
(which shoot from the bulb) have dried off and gone brown. You can try
just planting garlic you have bought from the shop, choosing the most
healthy, and preferably organic, ones you can find. If it sprouts a
shoot in your cupboard you might as well just place it in the ground
with the pointy side up and wait a few months. The donÕt
need much attention, just make sure the weeds donÕt smother
them, plant each bulb about 5 to 10 centimetres away from each other
for a thick matt of small garlic, or plant slightly further apart for
larger bulbs (though you will need good soil to grow large ones, and
you should fertilise at least twice in their growing season (with mild
liquid fertilisers).
Onions are planted from seed and can either be
sown straight into the ground or sown in trays then planted out after a
few weeks when the green tops are about 10 cm tall. If transplanting
you must remember to only just cover their roots with soil, as the
bulbs grows on top of the soil. It might be easier just to plant them
in clumps of 5 or 6 about 20 cm apart, but try and make sure that weeds
are kept to a minimum because they tend to grow slower than many
grasses and other weeds and you can easily loose them amongst the mess.
Planting in straight rows will help as you will be able to hoe either
side of them every now and again to give them a good start.
Onions can be slightly trickier than garlic so it
is best to ask for advice from a more experienced gardeners before
planting your first crop.

Spring Onions
Varieties to
look out for
Onions
Pukekohe
Long Keeper is reputed to be a very good variety for keeping (and is
grown in New Zealand). Creamgold Onion is another good keeper
(available through Diggers Seeds and Eden Seeds).
Senshyu
Semi-globe Yellow is a Japanese variety planted in autmun and harvested
in mid-summer (obviously some don't have to be planted after the winter
equinox. Other types include Mammoth Red, Carmen, Sturon, and Turbo.
There
are also many white varieties such as Albion and Staro and nice red
ones like the Italian Torpedo, which are great for salads but not so
good for keeping (brown onions tend to be better for this).
For
the tropics it is better to plant a "short day" variety - varieties
which from bulbs when days are between 12 to 13 hours long - like
Barletta (again, listed by Diggers).
Garlic
Small
Mexican and many Asian varieties are good for warmer climates.
Others
include Italian Purple, California Late, South Australian White and New
Zealand Purple.
Doesn't
mater what they are called, just grab a bunch from someone who has a
few good varieties and try your luck, they are much easier than onions.
Just remember, if in doubt, plant them a few days after the winter
equinox - unless it snows in your area, then you might have to wait a
bit longer or plant them in a hot house of some description.
email:greenpaddocks@gmail.com
© John
Atwood 2007
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