From Jon Lamb Communications
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October 11, 2019

Citrus gall wasp alert

Citrus gall wasps are about to emerge and invade trees across Adelaide.
The wasps will begin emerging from their over-wintering galls on October 16th; reach a peak around November 6th; with the final wasps emerging mid-November.
These dates – from the National Citrus Industry – Gall Wasp Control program – are earlier than predicted 2 weeks ago and are closely linked to last week’s warmer than average temperatures.
Within 3 days of emerging, female wasps will mate and lay up to 100 eggs (in bundles), under the bark of soft new branches. Gardeners with galls on their citrus trees will need to act quickly if they intend to prevent emerging wasps from re-invading and laying eggs.

Two effective control strategies

Citrus growers now have two excellent strategies to protect their trees from citrus gall wasp.
Both strategies involve spraying trees with products that will deter the wasps from laying their eggs and reinvesting their citrus trees. Timing of these sprays is critical.
Kaolin clay: This is a new product based on kaolin clay. It is mixed with water and sprayed over the trees canopy.
In citrus research trials, kaolin clay has achieved 90% suppression of citrus gall wasp.
In South Australia kaolin-based products are sold as Vasilis Citrus Gall Wasp Spray, available through many garden centres.
Horticultural oil: Available as eco-oil and Pest oil. (Follow spray directions). Not as effective as kaolin.
Both these sprays require two applications, with the first spray applied just before the wasps begin to lay eggs and the second two weeks later.

Peach aphids are back

It’s worth checking the tips of stone fruit trees at this time of the year for signs of peach aphids. 
These can be black or green and if ignored can quickly damage new tip growth or distort newly formed leaves (similar to peach leaf curl damage). 
Try spraying the tips with a horticultural oil. 
For major outbreaks, spray with the low toxic systemic chemical, Confidor. 
This will not affect bees as flowering is over. 
Unlike rose aphids, peach aphids can be hard to dislodge by squirting with water and are resistant to many traditional sprays.
Feature plant

Colourful Superbells – with “Punch”

They may look like Petunias but the latest “Punch” series of Superbells are in fact very improved forms of calibrachoas.
Punch Superbells literally smother themselves with distinctive, brightly coloured blooms from late winter until the end of the following autumn.
Like all calibrachoas, Superbells are sunlovers that thrive in the hottest of weather. However, they are also very easy to grow.
The plants are compact and spreading (30cm wide, 20cm high) making them ideal for container growing, particularly hanging baskets. They also look great spilling over the edge of an attractive feature container.
Popular Superbell varieties include Grape, Pomegranate, Blackberry and Strawberry.
Pictured are Calibrachoa Superbells 'Punch' Pomegranate (left) and Grape.

Calibrachoa Superbells Punch are available from leading garden centres.
More information here »

Choosing the best mulching material

The best mulching material for conserving moisture are chunky barks that hold their form well without breaking down rapidly during the warmer months.
On the other hand soft mulches that break down quickly (straw and leaf litter are ideal when you need to improve soil quality.
Be aware, during summer soft mulches can soak up much of the moisture that falls from showers or sprinklers.
To avoid this, water your plants using a drip irrigation system placed on the soil’s surface but underneath the layer of mulch.
Easy Colour Impatiens

Easy Colour impatiens has outstanding disease resistance

At last it is possible to grow brightly coloured, compact, container size impatiens in your courtyard without the risk of debilitating fungal disease.
Bright Mix impatiens has been carefully selected by Easy Colour for their ability to provide long-term trouble-free colour.
The plants are upright, but mounding (25 x 30cm) with excellent vigour and are very easy to grow.
Like all annuals in the Easy Colour Quick Pak range, they are particularly suited for planting in feature containers as well as garden beds.
Easy Colour annuals in their unique “pop out” cell packs are already in flower and provide months of vibrant colour from the instant they are planted.

Bright Mix impatiens are available from leading garden centres.
More on the complete Easy Colour Pak range here »

Watering strategies for the summer ahead

When it comes to watering the garden, soak the ground thoroughly and then allow the top soil to dry out before watering again.
If you’re serious about growing vegetables during summer, buy yourself a bale or large bag of mulching material (pea straw is ideal). 
Spread this over the garden bed between the plant rows.  It’s surprising the difference mulching makes in keeping the plant’s root system cool. 
This in turn makes the root system more efficient in gathering moisture and nutrients.  It will also help reduce the amount of water the plants need.

Plant-based oil effective organic insect control

eco-oil is a certified organic insecticide that controls sap-sucking pests like scale, aphids, mites, whitefly and citrus leafminer. 
It’s made from natural plants ingredients and can be safely used on edible plants with no withholding period.  Importantly eco-oil is safe for bees and other good insects. 
In fact, the special formulation will actively attract predatory insects, like ladybeetles, to feast on any residual pests.
Available at Bunnings, nurseries and online.

More information here »

Cut-and-come-again vegetables

 Quick-growing, space-saving vegetables, such as non-hearting lettuce, baby spinach and rocket are well worth growing. The leaves from well-established seedlings should be ready for eating six weeks after planting. The idea is to harvest the larger outside leaves regularly. A small number of plants should provide a constant supply of salad leaves for at least six to 10 weeks.
Popular non-hearting lettuce varieties include
  • Cos – green, upright stiff leaves
  • Lollo rosso – coral red, frilly, soft texture
  • Mignonette – green or red, soft, buttery
  • Mini oakleaf – green or red, soft, compact.

How to get the best from your roses

Spring is well and truly here and roses everywhere are blooming. As we know, roses go dormant during the cooler months, and in doing so, they pull nutrients back from the leaves into the plant and store them in the roots.  
The first flush of leaves in spring is essentially driven by stored nutrients, so from now on the plant needs to take up new nutrients from the soil. 
Roses should be feed regularly – at least once in each season - especially if you want to get lots of flowers and repeated blooms.
Roses love an organic-based fertiliser with a good level of potassium.
Potassium is critical, as a lack results in weak stems and shoots as well as flowers which are more susceptible to stress and disease.
Low potassium can be spotted by those reddy brown spots, and the edges of the leaves tend to become almost dry and brittle. 
Additionally, low potassium means the plants are unable to take up a whole range of other nutrients because potassium is really critical for nutrient uptake, so not having enough potassium will actually lead to limitations of other nutrients.
So how do you get your roses to perform at their best?
Click here to find out how »
Lawn Care – Stefan Palm

What about a DIY watering system for your lawn?

Have you started watering the lawn yet?
After last week’s burst of heat and the prospects of warmer and drier conditions ahead, when and how you water the garden and particularly the lawn is now an important issue.
In this week’s lawn blog, turf advisor Stefan Palm looks at DIY watering systems.
Stefan also provides a short video that contains a step-by-step guide on installing your own cost-effective lawn sprinkler system.
Read the blog and watch the video here »
Paul Munns Instant Lawn

Watering indoor plants

As day temperatures rise, new growth appears and many indoor plants will need watering more regularly than during winter. 
Don’t use cold water straight from the tap as this reduces the soil temperature, slows down growth and exposes the roots to fungal attack. 
Add a little warm water to the watering can.  It makes a big difference.

These plants need feeding    

Plants that continually produce strong, vigorous growth, particularly when part of this growth is regularly removed (by pruning) should receive fertiliser on a regular basis. 
In this case, we’re referring to fruit trees, vegetables, cut flowers or lawn. 
The aim is to replace the nutrients removed. 
Products branded as complete garden fertilisers (organic or manufactured) are quite suitable. 
However, it is important to follow the rates recommended on the product label.

Busy time for orchid growers    

Trevor Garard, Orchid Club of South Australia
The last flowers on Cymbidiums, Australian native Dendrobiums and terrestrial orchid are fading. Remove spent blooms, spent flower spikes and repot if necessary.  
Watch terrestrials as they lose their foliage and enter their dormant phase. Terrestrial tubers can be removed from the pots and held until repotting in the new year when they begin their new growing cycle. Some people leave the tubers in their pots but remove from watering as they die back.  
More information about terrestrial plants is available on the Orchid Club of South Australia website.
Late flowering, exotic genera plants may need extra attention as the weather gets hotter.
Check shade for glasshouses and keep evaporative air-conditioners clean as they can cause medical problems if started without adequate cleaning.
Plants that have a Spring/Summer growth spurt can have their fertiliser uptake increased as the days become longer and the plants put up new growths for next year. 
Neutrog’s Strike Back for Orchids is ideal as a fertiliser.
Those lucky enough to have plants of the Australian genus, Sarcochilus may soon see flower spikes emerging. Make sure they are well watered and shaded.  
This genus is fast becoming very popular, as small plants can have dozens of flowers and are suited to the smaller backyards/patios of modern houses.  
Modern hybridising is seeing the colour range increased enormously. These plants are well worth investigation.

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 & Sunday, October 12, 13
Spring Expo – Native Flower Display & Plant Sale
Australian Plants Society (SA Region). Adelaide Showgrounds.
Sat. 10am - 4pm; Sun. 10am - 3pm.

Open GardensOpen Gardens

Saturday & Sunday, October 12 & 13
ElderHood House
12 Prospect Road, Pt Lincoln
The large sloping block with views of Boston Bay, the town jetty and beyond has been terraced and the garden created on three different levels. From the driveway a few steps lead down to a bridge over a dry creek bed, to a lawn with a native frangipani as its centre-piece, and on to the house.
More information on the garden and directions »

6 Branch Road, Stirling
The garden dates from the 1850s when the Halliday family established a market garden and grew prize winning produce in the fertile valley.
The current owners have been caring for the garden, now two acres in size, for more than 53 years. It includes majestic old trees, including golden and claret ash, silver birches, English oaks, poplars and a sycamore.
More information on the garden and directions »

24 Hill Street, Mt Barker
The garden is wrapped closely around tanks and everywhere there are clever ideas, surprises and whimsy! The site is sloping so there are steps, winding paths and retaining walls often inset with mosaic and adapted to double as seats.
More information on the garden and directions »

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

More information on the 2019 season »

Weekend gardening weather

Talkback Gardening tomorrow

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

ABC Gardeners' Market
Join Jon Lamb and Deb Tribe as they broadcast Talkback Gardening direct from the ABC Gardeners' Market, located in the ABC car park – Rosetta Street, Collinswood. (8:30am to 10am).
Later in the morning you can listen to Sophie Thompson as she discusses organic gardening topics and answers gardening questions.

Coming soon

Saturday, October 19
Begonia and Fern Spring Show
Klemzig Community Hall, 242 North East Rd, Klemzig (enter from Wellington St). $2 admission. Morning and afternoon tea.

SA Chrysanthemum Society annual plant sale
10 Lucknow St, Marleston SA, 10am to 2pm.

Saturday & Sunday, October 19, 20
SA Geranium and Pelargonium Society spring show
Payneham Library complex, corner O.G. Road and Turner Street, Felixstow. Plant sales & display. Entry $3.

Saturday & Sunday, October 19, 20
Burra Spring Garden Expo and Open Gardens
More information:  Expo »    Open Gardens »

Saturday,  October 26
SA Chrysanthemum Society annual plant sale, second day
10 Sutherland Place, Golden Grove, SA, 11am to 2pm

Saturday & Sunday, October 26, 27
Rose Society of SA Spring Rose Show – Roses are Red
Burnside Community Centre, corner of Portrush and Greenhill Roads, Tusmore.
To be officially opened by the President of the World Federation of Rose Societies, Henrianne de Briey, 3pm Saturday afternoon.
Competitive rose classes in Australian Championships and World Federation of Rose Societies classes, lectures, floral demonstration, trading tables – gifts, plants, rose growing information, including “Identify your rose”. Entry $5.
Full program here »

Sunday, November 10
Art and Roses at The Cedars
Heysen Road, Hahndorf. An exclusive one-day celebration of  spring in the garden of the renowned father and daughter artists Sir Hans and Nora Heysen. Featuring reproductions with real flowers of the artists' still life works, display of heritage roses, talks on art and blooms.
10am - 6pm. $15 (children under 15 free) Includes entry to the garden, house and studios.

Regular garden attractions

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 »

The 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, 11am to 12.30pm.
Meet at the West lawn (Croquet Lawn) of Urrbrae House. Bookings not necessary.
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 »

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 »

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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.

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