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From Jon Lamb Communications
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June 28, 2019

Check soon for citrus gall wasp

It’s time to start checking the branches on citrus trees, particularly lemons and grapefruit for signs of the damaging citrus gall wasp. 
Look for small, cylindrical, light-brown lumps (galls) on recently produced pencil thin branches. 
Each gall contains dozens of minute larvae that will emerge as adult gall wasps early in spring. 
Removing the galls by pruning is an effective method of controlling this relatively new insect pest.
If the canopy of your tree is likely to be damaged by pruning i.e. dwarf size or espaliered, smear each gall with a thin layer of horticultural glue in August.
This will trap the wasps as they emerge, early in September.

Horticultural glue is available at most garden centres and is sold as Go Natural Tree Guard-Pest barrier.

    Our new competition is looking for . . .   
The biggest, ugliest or most unusual citrus gall

The search is on to find South Australia’s biggest, ugliest or most unusual gall, produced by the citrus gall wasp.
 ABC Radio Talkback Gardening and the Good Gardening newsletter are calling on SA gardeners to take photos of unusual galls affecting their citrus trees.

Send your entries to:
adelaideweekends@abc.net.au

Prizes include 500 gram pots of horticultural glue, (from Mitre 10, Unley) and vintage copies of the original SA Garden and Outdoor Living magazine.
Entries must be with the ABC by Monday, July 1 and the winners will be announced on ABC Radio TalkBack Gardening on Saturday, July 13.
The best photos will be published in the Good Gardening newsletter on Friday, July 12 and the winners published in the Friday, July 19 edition.

PICTURED ABOVE : Citrus gall wasp doesn’t normally invade lemon tree leaves.
This most unusual event was captured in our first competition entry, received this week from Tracy
at Hampstead Gardens.
Feature plant

For wonderful winter colour try Elite Nemesias

Plant breeding has come a long way with Nemesias.
They now stand tall, right through the winter weather, with strong flower stems producing clusters of vibrant, highly scented blooms. At the same time the plants have a compact bushy habit, growing to around 40 x 40 cm.
The colour range of Elite nemesias is quite stunning and includes many two tone flowers. These provide interest in the garden and look outstanding in large tubs on patios or in hanging baskets.
They also look wonderful planted in a ring underneath deciduous trees or standard roses, particularly after they lose their leaves – as the colour from the Nemesias really shines.
Elite Nemesias thrive in full sun or part shade and will continue performing from late autumn through to early summer.

More information »

   Pruning Pointers  

Don’t go overboard with winter pruning

Some gardeners have almost completed their winter pruning.
But don’t go overboard. There are only a few types of plants that benefit from winter pruning. 
Essentially, we’re talking deciduous – all roses, most fruit trees, but only some deciduous ornamentals.
Not evergreens: Resist any temptation to administer a short back and sides to evergreens. 
There will be little new growth between now and spring and should you create a visual disaster, there will be no relief (in the form of new growth) until the new season begins in September.
 

Hydrangeas need early attention

Hydrangeas like roses don’t remain dormant for long, with their big, fat, flower producing buds beginning to swell early in August.
Pruning at or after this stage means energy used to break dormancy will be wasted.
Before pruning, check where on the canes the flower buds are located. Ideally they should be spaced equally from the growing tip to the base of each cane.
  • Leave one third of canes unpruned
  • Prune one third of the canes by 50% — cutting just above  big fat buds
  • Prune the remaining canes just above the lowest set of fat buds

Take care with shaded plants

Hydrangeas growing in too much shade will have most of their flower buds at the top of the bushes.
Pruning all canes will significantly reduce flowering.
Try thinning the number of canes by 50% and leave the remaining canes unpruned.

Dwarf fruit trees the answer for small gardens

The problem of growing fruit trees around houses when space for a garden is at a premium has been solved.
Right now, it is possible to buy and plant an exciting and extensive range of dwarf deciduous fruit trees. 
These trees produce large crops of standard sized fruit but on a canopy that only grows 1.5 to 2.5 metres tall and less than two metres wide.
It now means even in small gardens or courtyards, there should be room for at least one fruit tree. 
Because dwarf trees are ideally suited to large container growing, there is also scope for those living in high-rise apartments to ‘grow their own’ on a sunny balcony or veranda.

Weed alert

Winter weeds that thrive in the cold have been quick to respond to our recent rains.
Weeds are much easier to control before they are well established. 
Try cultivating the topsoil lightly if the weeds are small or if they are well established spray with a herbicide containing glyphosate (It may take 10-14 days for chemical to act).
Lawn Care – Stefan Palm
Frost on lawn

Frosty lawns and the pale green connection

Another week of cold and frosty mornings and no doubt there is a lot more of this kind of weather yet to come.
While South Australia’s summer active lawns – particularly couch grass, buffalo and Kikuyu stop  growing when it is cold, SA turf advisor Stefan Palm points out that even when these grasses are covered with a thick layer of ice they survive quite well.
However, they invariably lose their Lush Green colour.
In this week’s lawn blog Stefan Palm looks at why this is so. He also considers why winter active grasses like tall fescue and ryegrass seem to thrive.
Stefan would also be interested in comments about how this season’s frosts are affecting your lawn.

More information on Stefan's blog here»
 

Soursobs in lawns

Soursobs in couch, buffalo and other winter dormant lawns should be allowed to develop until the plants are starting to flower. 
They will then be at their weakest stage and if cut by a mower, they are likely to die.
Lawn grasses will not be harmed if they are smothered by soursobs for a few weeks.
Paul Munns Instant Lawn

Improving soil health 

While citrus growth is usually minimal during winter, soil microbes are still very active. 
They can be stimulated by mulching the topsoil of your container with a thin layer of chicken manure pellets blended with a 2 cm layer of well-made compost.

Colour for a winter garden

It is not until the last autumn leaves on your deciduous trees and shrubs disappear that you realise how little colour there is in the garden at this time of the year.
Unless you take positive steps, the surrounding landscape will remain quite stark and uninteresting right through the winter months.
The quickest answer is to pay a visit to your local garden centre and select a few potted plants already in flower.  Federation daisies, lavender, kalanchoe, cyclamen and crab claw cactus are sure to head the list.
Another solution to the colour problem is to check the range of small shrubs that flower naturally at this time of the year. 
This list is not extensive but includes early flowering azaleas, Sasanqua and Japonica camellias, daphne, a very colourful daisy known as Euryops, as well as native plants including grevilleas, correas, thryptomene and hardenbergias.
Winx Rose
The Winx Rose, like the legendary mare, is the epitome of class. Its beautiful flower is the product of exquisite breeding to capture the same qualities that define Winx – elegance, longevity and brilliance.
The Winx Rose is new - and released for the first time in Australia.
This is an extremely elegant garden rose featuring pristine white coloured blooms that are retained on the bush for a very long time. The foliage is dense, dark green and glossy providing a great contrast to the flowers.
The Winks rose also has a compact bushy habit making it ideal for growing as a single feature, group planting or featuring in a container.
This is surely the perfect choice when you want a bright white garden rose. Definitely one for your list!

More information and online ordering here »

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.
Sunday, June 30
Grow, Grow, Grow Your Own
Wild vegetable fermentation demonstration, covering requirements including time, temperature, ingredients, salting, equipment & storage. Unley Community Centre, 18 Arthur Street, Unley, 2.30 pm. Please register to attend this workshop at peter.croft@mmc.com.au
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.

Guest – Sam Luke, plant manager, Balhannah wholesale fruit tree nurseries.
Topic – Home garden fruit tees –dwarf versus traditional. Plus, choosing the right varieties for your garden.

Coming soon

Saturday & Sunday, July 6, 7
Orchid Club of South Australia's winter show
Enfield Community Centre, 540 Regency Road, Enfield. Orchid culture demonstrations 3 times daily. Plants and accessories for sale and expert advice from the growers. tea, coffee and food available. Entry $5.

Wednesday, July 10
Woodville Academy of Floral Design workshop using bark and weathered wood

10 am at Kilkenny Community Centre, cnr Wilpena Tce & Tarcowie St, Kilkenny. Meeting alternate Wednesdays.

Saturday & Sunday, August 10, 11
Annual Camellia Show, Camellias South Australia annual show
Carrick Hill, 46 Carrick Hill Drive, Springfield. Sat. 12noon - 4 pm; Sun. 10. am - 4 pm
Quality plants for sale. Free admission to the show & Carrick Hill grounds.

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.

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 »

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 & 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 & 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, 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 »

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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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