Having done the research on root depth and rooftops, it seems that a root depth has to be four inches or less in order to protect the rooftop membrane.
I would love to have a temper tantrum and stomp my feet in protest, but alas, that wouldn't change the fact that two of my favourite plants have to go.
Sunflower roots can potentially go from 2-9 feet. I hope to transplant the volunteers we have growing on the roof to a ground level spot.
Rhubarb roots can also go to 10 feet. I plan on experimenting with putting the rhubarb in a container and seeing if it flourishes and even lasts through the harsh, Ottawa winter. I am also scouting out some space on the ground.
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