Category Archive: Q&A

Coffee Grounds As A Herbicide

Caffeine is a biochemical with the purpose of affecting the germination, growth, survival, and reproduction of other competing plants. Do not add coffee grounds to worm farms.

Protecting Pawpaw Plants Against Black Spot Disease

If you live in south eastern Queensland and grow pawpaw, it’s worth a quick health check right now. Mild, calm, showery, humid winter weather is perfect for observing outbreaks of pawpaw black spot… Continue reading

Mealybug: Kill! Kill! But How?

Question: “Hi Jerry, This year I have had the worst infestation of mealybug ever. My garden has never had them in the past, but this year everything including established Gordonia’s five metres high are… Continue reading

Hello, Emerald City! Tour Singapore With Jerry Coleby-Williams, 22-26 July 2016.

Gardens take pride of place in tropical Singapore. It’s never been a more exciting time for an Australian gardener to visit. Singaporeans are obsessed with chlorophyll… They have long talked up the benefits of a city… Continue reading

Miscast Mistletoe: Environmental Health Indicators Hiding In Full View

“Parasites aren’t all bad, and mistletoes deserve a rethink. If you study them, you’ll discover that they’re fascinating Australian plants making a valuable contribution to the environment.”

How Can ‘Dog’s Vomit’ Have A ‘Hive’ Mind? Enter The Kingdom Of The Slime Moulds

“Truly alien creatures…are all around us” Professor Christopher Reid, University of Sydney At dawn you could mistake them for vomited curry, something people find disturbing. They surface during the night, forming moist, sulphur-yellow… Continue reading

Why Does The Label Say My Ornamental Chilli Is Toxic?

Question: Yesterday a caller to 4BC Radio’s ‘Talking Gardening’ programme asked why the label on their ornamental chilli plant called it Capsicum annuum, and also said that it was “Unfit for Human Consumption”?

Mangelwurzel Harvest

I imagine everyone is outdoors, harvesting their mangelwurzels (Beta vulgaris subsp. maritima) today like me. A friend is thinking about brewing mangelwurzel beer, they’re supposed to make a potent drop. Alcohol is not… Continue reading

Living And Gardening With Koalas

Question: “Hi Jerry, Great to see you at the koala rally on Wednesday. Our next plan is to try and have a meeting with the developers. We were wondering if you might be… Continue reading

Why Do Fresh Woodchip And Potting Mix Turn Mouldy And Repel Water?

Question: “Dear Jerry, In the last year, I have had a soil problem that looks normal on the surface, but when you dig into the mulch, it is grey and looks like a fungus… Continue reading

Extreme Fire Weather Warnings…And Gardening

The Bureau of Meteorology has just issued a Fire Weather Warning for southern Queensland, and the ABC’s Weather Reporter, Jenny Woodward, advises people to drink plenty of water. What can a gardener do?

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