Double
digging is recommended, if
at all possible. Where this is not possible, improve the existing
soil by adding generous amounts of well-rotted manure, compost and
peat moss. Mix these well into the soil to a depth of at least 30cm
(12 inches). Where the soil depth is not sufficient, or to improve
drainage where soil contains excessive amounts of clay, using beds
built up to a depth of 15 to 20cm (6 to 8 inches) with good top
soil will provide suitable growing conditions.
Mix bone meal or super phosphate into the upper 30cm (12 in) of the
dug bed, breaking up any lumps. Allow the soil to settle before
planting. To avoid injury to the young roots DO NOT ADD any other
fertilizer at planting time.
Disease control
is obtained through protective sprays. A diseased plant cannot be
cured. Apply fungicidal sprays every 10 to 14 days from the time
new shoots are 10-15cm (4-6 in) high until October. Use materials
specifically formulated for rose black spot and mildew control,
such as Funginex alternated with benomyl or folpet (Phaltan).
In late spring,
when the soil has thawed and a hard freeze
is no longer expected, carefully remove soil mounds from established
plants so as not to damage any shoots that have begun growth.
Wash away the last of the soil from the centre of the bush with a gentle
stream of water. Clear away any prunings and dead leaves left from
last fall.
In the spring, newly planted roses should be cut back quite severely,
leaving only three strong canes 10-12 cm (4-5 in) long. This encourages
production of strong growth for a solid foundation. Established
rose bushes are pruned after the soil mounds have been removed in
the spring when canes show signs of growth usually April or when
the forsynthia is in bloom in your area.
Cut out any dead or diseased shoots to ground level. Remove weak, twiggy
and crossing shoots to their point of origin, leaving only 3-6 healthy
canes of pencil thickness or better. Cut these back to live wood,
as indicated by white pith. Pruning cuts are to be made with sharp
shears, about 5mm above an outward facing bud.
Winter Protection
Cut canes back to about 70cm to 1m (28-40 in) to prevent them whipping
about in the wind. Remove all dead leaves and any clippings from
the bed. Bring soil to the beds and build 20-30cm (8-12 in) high.
When ground is frozen, place leaves or branches over the mounds
for further protection.
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