Mandevilla competition

Hello, I’ve been growing Mandevilla on my south-facing, mid-town Toronto balcony for five or six years now, and am curious about the following: Most summers when I have grown the Mandevilla by itself in a pot (starting it as a…

Onion planting with potatoes

I saw on a recent publication the suggestion to plant an onion with potatoes to ward off a specific beetle. Two questions: 1. Is this appropriate when growing potatoes in a container or just in the ground?; 2. Can I…

Sunflowers Allelopathy and Vegetables

I read with interest your reply to a previous question here: https://www.torontomastergardeners.ca/askagardener/plants-that-will-survive-sunflower-seed-hulls-toxicity/. I planted sunflowers in a part of my vegetable garden and was not able to use it this year. Are there any vegetables that will grow after a…