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From Jon Lamb Communications
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November 6, 2020

Peak emergence for citrus gall wasp

Citrus gall wasp emergence in Adelaide is predicted to reach a peak this weekend.
According to the citrus industry gall wasp predictive service, the wasps began emerging almost 3 weeks ago and most will have emerged by the third week of November.
Gardeners wanting to prevent re-infestation from late-emerging wasps are advised to spray their trees with a kaolin-based product (available from garden centres) this weekend.
Citrus industry research has shown that kaolin clay is very effective in preventing the wasps from laying their eggs.

Have you mulched the garden yet?

Mulch has to be the most effective way of conserving our current higher than normal soil moisture levels, following above-average early spring rains.
The simple act of covering garden beds with a thin layer of mulch can achieve water savings of 25 to 30 percent.
In vegetable, herb, flower and small shrub gardens, “soft” organic mulches made from pea straw, hay, garden litter and compost are recommended.
These hold their form well and conserve moisture during summer then decompose during winter – adding significantly to soil health and nutrition.
In areas where the soil is in good shape and your main concern is to save moisture, mulch made from coarse material, such as chunky bark (10-20 cm), will allow rain to pass quickly through into the soil.
Keep in mind a moist, cool, root zone holds the key to keeping your plants operating at maximum efficiency.

Cucumbers and zucchinis easy and rewarding

Cucumbers and zucchinis are very easy to grow from either seeds or seedlings. 
Both mature quickly and can be harvested over an extended period. 
Some cucumbers produce vigorous runners but these can be contained by pinching out the tips when they are 45-50 cm long. 
This will increase their cropping potential. 
Both will produce fruits longer if they are protected from powdery mildew, a fungus that spreads when conditions are mild but dry. 
Try eco fungicide or milk (1 part milk, 10 parts water).
However, avoid sulphur sprays on cucumbers as they can burn the leaves during hot weather.
Feature plantsof the week

What’s not to love about Vincas?

Vincas suspend their colourful flowers over glossy, emerald green foliage.
The flowers shed cleanly as they fade and the plants rarely needing trimming.
Upright varieties work well in mass plantings, especially in landscapes where you're looking to make a big impact with little maintenance.
Full sun is best – but they can take part shade if there's good air circulation.
New season Vincas are now available in distinctive Easy Colour 4 cell purple packs.
These are bigger than those in traditional punnets and the plants are more advanced, reducing transplant shock and making sure the plants begin growing straight away.
Easy Colour
Vincas are in stock at Heynes Garden Centre, Norwood , Semaphore Pets & Gardens and Barrow & Bench, Malvern and should be available at other good gardening centres.

Bidens Campfire – colourful and compact

Campfire belongs to a new form of Bidens that has big, bold orange and yellow blooms, much larger than earlier varieties.
These are produced in profusion on compact plants that also feature attractive fernlike foliage.
Bidens Campfire is a sun lover and given a well drained position will provide you with year-round colour, although the blooms may fade a little during very hot weather.
Campfire is extremely easy to grow and is ideal for creating an eye catching colour display, particularly in front of garden beds or mass planted.
This colourful Bidens also looks great in pots and hanging baskets.

Proven WinnersBidens are in stock at Heynes Garden Centre, Norwood, Semaphore Pets & Gardens and Barrow & Bench, Malvern and should be available at other good gardening centres.

Flowers from seed

The seeds of many colourful flowers, sown now into garden pots or planter boxes should germinate quickly. 
Water the potting mix slowly but thoroughly after sowing and then withhold further moisture until the seeds germinate. 
This will help prevent damping off diseases. 
Seedlings planted over the next few weeks will bloom in summer and continue well into autumn. 
Large, bold displays using one or two colours can look very effective.

Remembering Dolly’s Dream

Dolly’s Rose is a stunning fragrant shrub rose featuring large cup-shaped flowers produced in small clusters of 3-5 blooms on strong stems.
The flowers have an attractive deep purple colour in warm weather, but change to a more intense burgundy on cooler days.
Typical of a nostalgic rose, Dolly’s Rose has a lovely strong fragrance showing an oriental character. It repeat flowers extremely well and the blooms hold well when used as a cut flower.
This is an attractive well branched rose with good disease resistance.
Dolly’s Rose is a fundraising collaboration between Knights Roses and Dolly’s Dream.
In remembrance of Amy “Dolly” Everett, a royalty is paid from every sale to Dolly’s Dream which will support programs that focus on educating and creating behaviour changes in schools and the community to reduce bullying and cyber bullying of young people.
Knight's Roses
Knights' Roses, one of the largest rose growers and suppliers in Australia, offer a comprehensive collection of rose bushes to both wholesalers and the public. 44 Jack Cooper Drive, Gawler, SA. Phone (08) 8523 1311.
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Topiary with distorted leaves

Low hedges and topiary featuring the Australian native, Syzygium or lilly pilly, are catching on fast. 
Syzygiums thrive in our cold, wet winters and, once established, have good tolerance to hot weather.
Right now they should be producing bright, bronze tip growth. 
Check this growth for signs of leaf distortion caused by a damaging sap sucking insect known as psyllids. 
If present, trim the tip growth lightly to remove the existing psyllids. Then apply a systemic insecticide (or tablet) containing imidacloprid (Confidor).
This is one of the few home gardener insecticides that is effective against this pest.
Black spot on roses

All-in-one plant protectant for spots and rots 

Persistent showers in spring, invariably result in damaging fungal spots and rots.
Roses face the biggest threat, initially from black spot but if conditions remain damp and temperatures move into the 20s, rust will also take its toll.
Fortunately there are some excellent new fungicides available to achieve effective control.
Yates Rose Shield Concentrate is a good example as it is an all in one protectant containing a fungicide, insecticide and miticide.
Even better it can be used to protect all ornamentals in the garden. Simply spray the foliage thoroughly including the underside of the leaves at the first sign of insects or disease.
As a plant protectant Rose Shield combines systemic control for a wide range of fungal diseases, including black spot, powdery mildew and rust.
It also provides effective control for leaf and bud eating caterpillars as well as damaging sap sucking insects such as aphids, thrips and hard to control mites.
Yates Rose Shield Concentrate is available from most garden centres and garden outlets.

 More information »

Is the damage earwigs or snails?

Damage caused by earwigs is often confused with the holes left behind by slugs or snails, and even caterpillars.
Earwigs tend to leave large numbers of small irregular shredded holes in leaves and petals, whereas slugs and snails usually produce larger smooth edged holes around the outside of leaves.
Caterpillars tend to create varying sized holes within (but often around) a leaf.
During daytime all of these pests take refuge in nearby cool, damp locations – beneath bricks, pots, timber and, all too often, garden mulch.
 

Strategies for reducing earwig populations

The key to preventing earwig damage is to reduce the population to a stage where they no longer need to leave the confines of your garden mulch looking for food.
Because earwigs often gather in groups when they hide, it is possible to eliminate large numbers very quickly by regular trapping.
Try filling an empty clay pot (filled loosely with crumpled newspaper) on its side adjacent to where the insects are feeding.
Each morning, clear the traps but you will need to be diligent. These critters are expert escape artists.

• If you have any successful ideas for earwig traps please take a photo and send it to Good Gardening »
Lawn Care – Stefan Palm, Paul Munns

Solving lawn problems

Lawns are once again playing a major role in the home garden.
But it raises the question – what do you do when problems arise that are specific to your lawn?
So far this season turf consultant Stefan Palm and his team of lawn consultants have been confronted with a number of major issues including mites, moss and algae, weeds and black beetle.
Then there are the day-to-day problems, such as choosing the right kind of lawn grass and how to install your own lawn irrigation system.
In this week’s lawn blog Stefan outlines some of the many lawn services that he and his team are able to provide for home gardeners in SA.

More information »
Paul Munns Instant Lawn

Yes, you can restore your potting mix    

Potting mix contains a significant proportion of small chunky pieces of bark along with soft absorbent humus. The bark provides spaces needed to allow air and moisture to move freely within the mix while humus supports the microbes essential for potting mix health.
In a plant container the combination of plant root growth and constant watering slowly degrades the chunky bark particles and humus

Action needed
  • Place last year’s potting mix in a heap
  • Add up to 20% by volume of quality compost to the heap and mix thoroughly
  • Consider adding a three-month slow release fertiliser and also a granular soil wetting agent
  • Refill your containers
Humus in the compost will quickly return structure to the potting mix. This in return will improve aeration and drainage and significantly improve its fertility and health.
Restored potting mix is best used for re-potting plants growing in large containers, 20 cm and over.
 

Quick tip when repotting small trees and shrubs plants

Small trees should not be planted directly into a large container, as the potting mix outside the root ball will remain wet and inhospitable to new root growth.
In this case, repot your plant into a container twice the width of the existing root ball and then bury this within the large container.
 

Don’t over stimulate house plants

Resist the temptation to stimulate house and patio plants into extra growth by feeding with extra fertiliser. 
More attention to correct watering will give a better result. 
Wait for the top few centimetres of soil to dry out and then give the plant a good watering.

Please keep your questions for Talkback Gardening

Good Gardening  is unable to answer individual reader's questions via email.
If you're looking for specific gardening advice please give me a call on ABC Radio Adelaide's Saturday morning Talkback Gardening  or speak to the experts at your local garden centre.
Saturday, November 7
Orchid Opportunities
SA Orchidaceous Society. Adelaide West Uniting Church Hall, 312 Sir Donald Bradman Drive, Brooklyn Park. 9.30 am - 4.30 pm

Sunday, November 8
Mermaid Rose Garden Fair, Cummins Historic House
23 Sheoak Avenue, Novar Gardens, 11.30 am - 4 pm. Celebration of heritage roses with guest speakers, two live classical  performances, garden tours and Victoriana Society members in period costume. Admission $10, children under 12 free. Plant sales, Devonshire teas, sausage sizzle, coffee van also available. Further details and pre-booking available on Eventbrite »  Or pay (cash only) at the gate on the day.

Open GardensOpen Gardens SA

Saturday & Sunday, November 7 & 8
Chez Nous
12 Talunga St, Birdwood
A picket fence and a profusion of roses clambering up and over an arbour at the front gate at Chez Nous add charm and complement the old stone home. The half acre garden is loosely divided into rooms that blend cottage and formal style with a touch of French ambiance.
More information on the garden and directions »


Drouin
12 Mossop Court, Littlehampton
An avenue of mature trees leads into Drouin revealing five acres of colourful and extensively planted gardens. More than 800 roses – shrub roses in all shades make a dazzling display with added pizazz from the many climbers that cover arches, arbours and a recently-added, domed gazebo.
More information on the garden and directions »

Gardens open 10 am to 4.30 pm.
Entry $8 - OGSA members; $6 - Government concession card holders; children under 18 free.

More information on the 2020 season »

Weather forecasts

Talkback Gardening tomorrow

ABC Talkback Gardening podcastsABC Radio Adelaide Talkback Gardening this Saturday, 8.30 am to 10 am – phone Deb Tribe and me on 1300 222 891 and have your own gardening question answered.

Independent climatologist Darren Ray provides his monthly update on South Australia’s weather outlook and how this is likely to affect our gardens.

Garden centre directory

Leading Adelaide garden centres recommended by Good Gardening newsletter.

Heynes Garden Centre


Heyne's Garden Centre
283-289 The Parade, Beulah Park. (08) 8332 2933
Try something new this season and plant some bush tucker! Australian natives – producing edible fruit, nuts, seeds and leaves. Head in and check out our range.
South Australia's oldest established garden centre. Huge range. Expert staff on hand for personal advice. Visit online »


Semaphore Pets & Garden
Semaphore Pets and Garden
119 Semaphore Rd, Semaphore. (08) 8242 7302
We have an extensive range of indoor & outdoor pots and plants to get your home all dressed up for Christmas! Lots of mature indoor plants and stacks of yummy fruit trees to put a smile on your dial.
Always has a great selection of plants, pets and giftware – all under the one roof.
Facebook »

Barrow & Bench
Barrow & Bench Mitre 10
321 Unley Rd, Malvern. (08) 8272 8566
Now’s the time to be preparing & planting your garden for Christmas and for festive-season wow.  Potted annuals, perennials and beautiful garden art in store now.
Specialises in providing quality plants and expert garden advice. Follow the Instagram feed »

Coming soon

Friday, November 13
Magnificent Clare Valley heritage rose garden
Kay and Walter Duncan, Sevenhills. From Adelaide, turn at Sevenhill Hotel into  Bayes Road and then Gillientown Road. 10 am - 3 pm.

Saturday & Sunday, November 21 & 22
Cactus and Succulent Society of SA Spring Sale
Noarlunga Leisure Centre - Court 3, David Witton Drive, Noarlunga Centre. Pre-purchased ticket event only. Details here »

Regular garden attractions

Check with each venue's web site for any Covid-19 restrictions on opening hours.

Adelaide Botanic Gardens – free guided walks

Friends of the Botanic Gardens of Adelaide guided walks for the public at Adelaide, Mount Lofty and Wittunga Botanic Gardens, and Botanic Park.
More information »

Carrick Hill

Heritage house museum and garden, the former home of Sir Edward and Lady Ursula Hayward. Open weekends & public holidays. Free admission into garden and grounds. 46 Carrick Hill Drive, Springfield.
More information »

Cummins Historic House and gardens
23 Sheoak Ave, Novar Gardens. Gardens open and plant sales on 1st & 3rd Sundays of each month (except Dec & Jan) 2 pm - 4.30 pm. Plant sales also available every Friday morning 9 am to noon. More information »

Heysen - The Cedars
The historic home of two of Australia’s most noted artists, Sir Hans Heysen and his daughter Nora. This unique 60-hectare heritage estate features the original family home, two artists’ studios and the celebrated cottage-style garden, planted chiefly with exotics, including the massive Himalayan cedar trees.
Heysen Road, Hahndorf. Open 10 am - 4.30 pm, Tuesday to Sunday, and also open on public holiday Mondays. Ticketed entry, including guided tours at 11am, 1pm and 3pm.
More information »

Urrbrae House historic precinct gardens
At the end of Walter Young Avenue, off Fullarton Road, Urrbrae, or from the Urrbrae House gate, Claremont Avenue, Netherby.
Open from dawn until dusk every day. Free entry.
More information »

Waite Arboretum, Fullarton Road, Urrbrae
Open free to the public every day of the year from dawn to dusk, except on fire ban days. Free guided walks on the first Sunday of every month, 11 am to 12.30 pm.
Meet at the West lawn (Croquet Lawn) of Urrbrae House. Bookings not necessary.
More information »

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Disclaimer: Although all reasonable care is taken in preparing information contained in this email, neither Jon Lamb Communications (JLC) nor its officers, staff or suppliers involved in the editing and production of this email accept any liability resulting from the interpretation or use of the information set out in this document. Information contained in this document is subject to change without notice and is of a general nature and should not take the place of professional personal advice. No responsibility is accepted by Jon Lamb Communications for the accuracy of information contained in web sites linked from this email. Publication of an advertisement does not constitute endorsement by JLC of any product or service, or warrant its suitability.

Copyright © 2020 Jon Lamb Communications, All rights reserved.


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