Propagation
of Telopea (Waratah) Species.
Waratahs can be grown from cuttings but the more usual way is from seed. Fresh
seed has a high viability and germinates in 2-3 weeks after sowing. Plants
should be potted up as soon as they are large enough to handle and grown in a
sheltered position.
When selecting a plant for planting into the garden ensure that it is at least
15 cms (6") tall. Plants of this size should have a noticeable swelling at
the base of the stem where it enters the soil. This 'swollen'; tissue is called
a lignotuber and it contains numerous dormant buds. When established in the
ground old canes can be cut right back to the lignotuber which will promptly
sprout new stems. This is an evolutionary adaptation to some of the extremes of
the Telopea environment (particularly bushfire) which ensures the plants's
survival.
Cultivation of Telopea spp.
Waratahs generally appreciate a friable soil of good texture. The incorporation
of a rich leaf compost or similar material is beneficial. If other soil is add
to the site, always incorporate it into the existing soil. Do not excavate a
large hole and then fill it with a good soil mix, as water will accumulate in
the hole resulting in wet feet and probable plant death.
Good drainage is essential, and if possible should extend to a depth of 45 cm
(18"). Drainage can be improved by building a raised bed or mound. If this
is done, be sure to break the existing soil where the mound is to be located so
that the new soil can be incorporated with the existing soil.
Watering can be carried out during hot or dry spells. Never let the soil dry
out completely. Over-watering in heavy soils will cause waterlogging.
Waratahs appear to be adaptable to various situations but a semi-shaded
position or at least shade from afternoon sun is desirable.
Mulch the surrounding soil to a depth of 5-6 cms (2"-2 1/4"). This
will help to keep the soil moist and keep the surface roots cool. Mulch also
helps to prevent weed growth in the vicinity of the plant. If weeds are allowed
to grow they provide direct competition to the plant for nutrients and water.
Removal of weeds may also disturb the surface roots and result in setback of
the plant.
Plant the waratah in such a place that it is able to receive plenty of air
circulation and room in which to grow.
Flowers can be cut for indoor decoration or can be removed from the plant after
flowering has finished by cutting the canes back to at least half of their
length. Do not let seed set unless it is wanted as the formation of seeds sap a
lot of strength form the plant.
Waratahs respond well to applications of a slow-release nitrogenous fertilizer
such as blood-and-bone or a slow release general purpose fertilizer such as
Osmocote applied at 100 gm/sq.m. once each year in Spring.
Further reading:
Wrigley, JW & Fagg, M (1989)
'Banksias, Waratahs and Grevilleas and all other plants in the Australian
Proteaceae family'.
William Collins Publishers, Sydney, Australia.
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