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From Jon Lamb Communications
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August 30, 2019

New solution for citrus gall wasp

New natural clay-based products could provide home gardeners with a safe, practical and very effective alternative for controlling citrus gall wasp.
The products, made from very fine kaolin clay are achieving 90% suppression of citrus gall wasp in national citrus industry trials.
The clay is mixed with water and sprayed onto infested trees as the wasps emerge from their overwintering galls – but before they mate and begin laying eggs.
This deters the wasps from laying eggs.
Two sprays are needed, two weeks apart and timing is critical.
Wasp emergence is expected late in September and during early October. More accurate dates will be published in the Good Gardening newsletter.
 

Citrus gall wasp spray available now

In South Australia kaolin clay is now available in 200 g home garden packs, sold as Vasilis Citrus Gall Wasp Spray. It should be available from selected garden centres this weekend.
 

Controlling citrus gall wasp on dwarf trees

Removing galls caused by the citrus gall wasp by pruning is still a very effective method of preventing re-infestation in the coming season.
However, when trees are small, dwarf or trained as an espalier, this method is not always practical.
Try coating the galls with a thin layer of horticultural glue.
This will prevent the juvenile wasps from emerging.
However, it needs to be applied before the wasps begin to emerge, later in September.
Horticultural glue is sold as Tree Barrier and should be available at your local garden centre.
Feature plant

The benefits of growing Buddleja Buzz

Bushes that are naturally small, compact and continually covered with colourful blooms are always in demand.
But with Buddleja Buzz that’s not all.
The blooms are big and come in waves almost all year round. These are particularly attractive for butterflies bees and small birds. Pictured above is Buddleja Buzz Sky Blue.
Because the bushes are naturally small (1 m x 1 m) they adapt well to container growing.
However, they make ideal edging plants in a sunny courtyard and look great when mass planted in the landscape.
Buddleja Buzz is hardy, cold-tolerant and, apart from an occasional trimming, needs very little maintenance.
 
Buddleia Buzz are available from leading garden centres.
More information here »
Spring garden guide download

Keep an eye on soil temperatures    

Topsoil temperatures normally jump 3°C between August and September (Adelaide’s average August soil temperature at a depth of 20 cm is 11°C, while in September it averages 13.7°C.
Yesterday’s BOM reading was  4 to 5°C  below the September average.
However, September’s predicted warmer and drier conditions will need to eventuate soon if the topsoil in your garden is to reach the magic, tomato-planting 16°C.
Good gardening will provide regular topsoil updates through early spring.

Time to select and prepare tomato beds

If you’re thinking of growing tomatoes in a garden bed later this season, give some thought now to where they will grow. 
Sunshine is essential (minimum 6 hours). 
Now is also the time to dig large quantities of compost and aged animal manures into the planting area. 
The combination of sunshine and organic matter will produce big benefits when it comes to plant health and yields.

The importance of microbes

As gardeners, we all know plants grow better in well-structured soil, but what exactly are structured soils?
We know that poorly structured soils don’t allow water or air to penetrate - this is often due to compaction or over-working the soil, especially when it’s wet and waterlogged - you just end up with a sticky mess.  
In essence, well-structured soil is a soil where, by volume, about half is what people call soil (clay, sand and silt), and the remaining volume should be for air and water spaces, along with organic material, soil bacteria and fungi.  
Microbes play a huge role in producing and maintaining structured soils.
Many people think that adding organic matter to the soil will instantly give them a more structured soil, but this is not actually true. It is not until the microbes, and to some degree other soil animals such as earthworms, have delved through the organic matter that the soil structure changes.  
There are three main ways in which microbes enhance soil structure.
Click here to find out how »
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House plants have the yellows

Don’t be alarmed if the oldest leaves on your favourite indoor plants are turning yellow and then fall. 
Small leaf drop is normal at this time of the year and is a prelude to new spring growth.
However, excessive yellowing and leaf drop indicates a root rot problem, probably associated with over-watering during winter.

Blueberry Kisses – coming soon

Blueberry Burst a very productive, dwarf, evergreen blueberry was released by Balhannah Nurseries in SA some years ago.
It is now producing masses of large juicy berries in many home gardens.
A sibling –  Blueberry Kisses –  is now almost ready for release.
Blueberry Kisses is another dwarf blueberry bush and, like Burst, it is also highly productive.
The great news about this variety is that it will extend the Blueberry Burst season. You will be able to pick fresh, tasty blueberries for many months on end.
Blueberries are delicious, healthy, antioxidant rich fruit and have been nick-named brain berries and youth berries because of their high antioxidant levels.
Blueberries have quite specific growing requirements including free draining, low pH soils or potting mix.
Follow the recommended planting and care instructions and you will end up with a fantastically successful crop.
Great advice on growing blueberries here »

Time to trim old and dead citrus branches

Citrus trees often become woody as they mature, particularly near the centre of the tree. 
Now is a good time to remove old and deadwood. 
Take the opportunity to thin out a number of smaller branches within the canopy. 
This will allow more light to penetrate and increase the tree’s cropping potential. 
Hold off a few more weeks if you’re in a frost-prone area.
 

Summer bulbs – now's a good time plant

Late winter is a good time to plant some of the lesser-known but hardy summer bulbs such as calla lilies, tigrideas (Jockey’s Cap), hippeastrum and valottas (Scarborough Lily).
Lawn Care – Stefan Palm

Creeping Oxalis – invasive and persistent

It looks like a creeping clover but the flowers are yellow and lawn lovers will tell you as a weed it is very difficult to control.
The weed of course is creeping oxalis and once established in your lawn it becomes very invasive.
As turf advisor Stefan Palm points out in this week’s lawn blog, the secret to effective control involves a persistent, programed approach, combined with sound information on how and when it grows.
You will find some excellent images of creeping oxalis along with some sound information on strategies for effective control here »
Paul Munns Instant Lawn

Broad Beans need bees         

Broad beans are flowering profusely in many gardens – but, are they setting pods?
While broad beans can self pollinate, crop research indicates pod set can be increased dramatically (40 to 50%) if the flowers are pollinated by bees.
Close planting, particularly between rows, seriously restricts the bees' ability to forage. Worth noting for future planting.
 

Reasons for poor pollination

  • Too cold for bees to work.
  • Too wet (bees will work between showers).
Ideal temperatures 13°C to 20°C.
Native bees are very effective in pollinating beans.
 

Soil stimulants a boost for spring growth

The quickest way to activate cold-tolerant plants that are starting to produce new spring growth is to stimulate their roots with liquid seaweed or liquid compost (Seasol or Go-Go Juice).
These contain important plant growth hormones as well as a range of elements to stimulate hordes of natural microbes in the soil. 
Their role is to help convert fertilisers and other soil nutrients into a form that the plants can use. 
These products are stimulants and not a substitute for normal plant fertilisers.
More on spring planting in my Advertiser gardening column, tomorrow
 

Worth planting this weekend

Vegetables: Broccoli, hybrid cabbage, silver beet, bok choy, lettuce, peas
Herbs: Coriander, parsley, chives, mint

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, August 31
Rotary Club of Coromandel Valley spring plant sale
Waite Reserve Blackwood (behind Coles Car Park), 8.30 am – 2.30 pm. Almost 4,000 good quality plants, most at $4 or less if buying 10 or more. Funds raised support Rotary projects.

Sunday, September 1 (Also 8, 15 & 22)
Camellia Society Adelaide Hills open days
Stangate House, Euston Road, Aldgate. 12 pm - 4 pm. Admission $5, under 14s free.

Open GardensOpen Gardens

Saturday,  August 31 & Sunday, September 1
Avondale 1
146 Avondale Road, Rhynie
Avondale is an informal country garden transformed each year in spring when masses of beautiful bulbs burst into flower creating a patch of colour on the surrounding green woodland.
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 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.

Broadcast live from the Royal Adelaide show. Come and join us as we chat to many of the horticultural and gardening exhibitors and experts at the Goyder Pavilion at the Royal Adelaide Showgrounds.
There will be plenty of time to ring through with your gardening questions.

Coming soon

Friday, September 6
Rhododendron Society’s Grant Memorial Lecture
International award-winning landscape architect and media personality Jim Fogarty. Coventry Library, 63 Mount Barker Road, Stirling, 6.30 pm. $20, including wine and cheese. Contact for more details »

Saturday & Sunday, September 7, 8
Enfield Horticultural Society Spring Show
Klemzig Community Hall, 242 North East Road, Klemzig. 12 - 5 pm Sat, 10 am - 4 pm Sun. Admission $2. More information 8251 2299.

Sunday, September 8 (also 15 & 22)
Camellia Society Adelaide Hills open days
Stangate House, Euston Road, Aldgate. 12 pm - 4 pm. Admission $5, under 14s free.

Sunday, September 15
Herb Society of SA - Herb & Salvia Propagation Workshop
Herb Garden at back of Findon Community Centre, 222 Findon Road, Findon, 2 - 4 pm  
Tour the Herb Garden and lean how to propagate herbs and salvias. Materials provided. Bring your own secateurs. More details »

Saturday, September 21
Spring Garden Festival, Mount Pleasant
Stalls featuring quality plants, garden furniture, decor and garden-care products.
Showgrounds, Melrose Street. 8 am - 3 pm. $5 entry, concession $3, child under 15 free.
More information »

Goody Patch Community Garden annual plant sale
Quality and well-priced plants, vegetables, succulents and herbs as well as baked goods and preserves. Goodwood Primary School gate, Goodwood Road, 9.15 am to 12 pm. More information »

Saturday & Sunday,  September 21 & 22
Orchid Club of South Australia Spring Show
Enfield Community Centre , 540 Regency Road, Enfield. 10 am to 4 pm each day. Pies, pasties, Devonshire teas. Trading table, plants and accessories, cultural demonstrations and raffle. Expert advice from friendly, experienced growers. Entry only $5.

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

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, 10 am 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.

Burra Spring Garden Expo and Open Gardens
More information »

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, 3 pm 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, October 27
Herb Society of SA - Spring Salvia Sale
Fullarton Park Centre, 411 Fullarton Road, Fullarton
8:30am - 12 noon, free admission and parking.
Choose from a large selection of Salvias - be early for the best choice!
More details »

Sunday, November 3
Herb Society of SA - Herb Day Market
Fullarton Park Centre, 411 Fullarton Road, Fullarton. 10am - 3pm, free admission and parking.
The largest selection of potted herbs for sale, herb seeds and books. Guest speakers presenting on a range of topics.  Herb identification – bring your plant sample along. More details »

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.
10 am - 6 pm. $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, 11 am to 12.30 pm.
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.

Copyright © 2019 Jon Lamb Communications, All rights reserved.


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