Selwyn Times: March 31, 2021
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Wednesday <strong>March</strong> <strong>31</strong> <strong>2021</strong> <strong>Selwyn</strong> <strong>Times</strong><br />
Latest Canterbury news at starnews.co.nz<br />
GARDENING <strong>31</strong><br />
Time to tackle the<br />
tricky garden pests<br />
AUTUMN DAYS herald a<br />
change towards cooler weather,<br />
the soil stays moist and there’s<br />
colour everywhere.<br />
It can also be the best season<br />
for planting, because new plants<br />
have time to settle in before<br />
they’re faced with their first<br />
summer.<br />
Fertilising<br />
Spread organic pellets around<br />
shrubs and flowerbeds.<br />
Feed citrus and other fruit trees<br />
with citrus food.<br />
Clear away weeds and grass<br />
at the base and spread a layer of<br />
organic mulch over the root area<br />
(keeping well clear of the trunk).<br />
Remember, feeding with high<br />
potash fertilisers encourages<br />
blooming and, even more<br />
importantly, builds plants’<br />
resistance to disease (essential<br />
at this time of year when fungal<br />
problems are rife).<br />
Lawn care<br />
Give lawns a feed with a longlasting<br />
fertiliser. Early autumn<br />
is the ideal time to rejuvenate<br />
tired lawns. Spike with a fork or<br />
a purpose-designed lawn aerator<br />
PESTS: Caterpillars and white butterflies will destroy<br />
cabbages.<br />
and oversow with a lawn seed<br />
blend.<br />
Pest control<br />
Watch out for the autumn<br />
influx of caterpillars.<br />
White moths and butterflies<br />
attack cabbages, cauliflowers,<br />
rocket and their relatives,<br />
vine moth caterpillars are<br />
demolishing grape leaves, flax<br />
caterpillar is stripping leaf<br />
sections of leaves, leaf rollers are<br />
knitting leaves and emerging to<br />
graze on apples, feijoas and other<br />
fruit.<br />
Use low toxic options for<br />
controlling most caterpillars.<br />
Grass grubs and porina, too, can<br />
destroy lawns.<br />
Treat weeds<br />
Many annual weeds are<br />
approaching maturity and should<br />
be removed before they have the<br />
chance to spread their seeds.<br />
Other autumn tasks<br />
Prune the hydrangea stems that<br />
flowered last summer.<br />
Reduce clusters of camellia<br />
buds to one per stem. Divide<br />
perennial plants and spread to<br />
other parts of the garden.<br />
After their leaves have fallen,<br />
spray deciduous fruit trees (eg<br />
peaches) with a copper fungicide.<br />
Good coverage will clean up<br />
the remains of summer pests and<br />
diseases. Move cold-sensitive<br />
container plants into shelter.<br />
MOISTURE: Mulch shouldn’t be used just to make the<br />
garden look tidy.<br />
Use mulch judiciously,<br />
don’t make volcanoes<br />
MULCH, IT seems, is the new<br />
compost.<br />
There’s nothing wrong with<br />
mulch when it’s used judiciously,<br />
but creating ‘‘mulch volcanoes’’<br />
around your trees is a very bad<br />
idea, especially when it’s done<br />
mainly for aesthetics.<br />
The root zone of an established<br />
tree extends beyond its drip<br />
line, so mounding the mulch<br />
against the trunk does little for<br />
the roots, except cause roots near<br />
the trunk to grow into the mulch<br />
volcano.<br />
The piled-up mulch can soften<br />
the bark of some young trees and<br />
invites insects and diseases.<br />
The lower trunk, unlike the<br />
roots, cannot easily survive<br />
long-term with the constant<br />
moisture the volcano traps—it’s<br />
the equivalent of planting a tree<br />
too deeply.<br />
Bear in mind that the main<br />
reasons for mulching are to<br />
retain soil moisture, suppress<br />
weeds and moderate soil<br />
temperatures — not to cover the<br />
garden so it looks tidier.<br />
10% TO<br />
50%<br />
OFF ALL PLANTS*<br />
AUTUMN<br />
*While stocks last!<br />
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