The
hop plant (Humulus lupulus) is a rough twining
vine with separate male and female plants. The male
plant has a finely branched inflorescence whilst
the female
plant bears flowers in the form of cones - the parts
of the plant that are used in brewing. The mature
hop cones are generally between 2 cm and 8 cm long,
yellowish
green, and papery to the touch. The cones are harvested
and dried in August and September
- vigorous varieties will produce as much as 1 Kg of dried flowers per plant.
The dried hop cones are used in brewing for bittering, flavour and aroma
and preservation. Hop varieties get their properties
or active principles from
small yellowish glands at the base of the cone petals
within the bracts or scales.
The gland is covered by a waxy skin within which lies all of the unique bittering
(alpha acids) and aromatic (oil) compounds. These glands are referred to
as Lupulin.
The quality of hops depends largely on the amount of lupulin they contain
and when derived from the fresh hop flowers it is
more abundant and of better quality. The
alpha acid level determines the bitterness of a particular hop variety and
the higher the percentage alpha acid by weight the more bitter the hop in
direct proportion. >Availablity
List Here< To
order hop rhizomes for delivery outside
the EC
please
contact us for details.
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These excellent paperback
reprints of Hop
Cultivation by Charles Whitehead, The
Hop and its Constituents and George Clinch's
classic English
Hops are now available from Wellowgate
Publications
Hops
are hardy, perennial plants which produces annual
vines from a permanent root stock or crown. Vines
may grow up to 25 feet in a single season but
will die back to the crown each autumn. In addition
to the true roots and the vine, the crown also
produces underground stems called rhizomes which
possess numerous buds and are used for vegetative
propagation. Hops
prefer deep, well drained soil as they put down
a very strong underground root structure - the
true roots can penetrate to a depth
of more than 4 metres. During the first year there may be only slow
vegetative growth and few flowers as the plant develops its rootstock.
Abundant growth and a good hop crop can be expected in the second year.
A couple of applications of a nitrogen-rich fertilizer or manure between
March and June will help ensure a good crop. Plant early in the spring
about 1 metre apart and provide a strong support system for the vines
- anything between 2 and 4 metres will work fine. Harvest dates will
vary according to variety and location but at maturity the hop aroma
will be very strong when the cone is rubbed between the fingers. The
cones develop a drier, papery feel and tend to become lighter in colour
- some browning of the lower bracts is a good sign of ripenesss.
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