Viewing post #1353571 by SteveM

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You are viewing a single post made by SteveM in the thread called Color as are faded?.
Aug 17, 2020 2:10 PM CST
Name: Steve
San Diego
Commercial cut flower grower
I agree, dahlias need a certain amount of sunlight in order for the pigments to express. But, 30-40% shade seems sufficient (here) for full anthocyanin expression while, at the same time, keeping the reds and dark reds from fading. I also get a better blush on the whites under shade compared to full sun (when the lavender washes out). Likely, somewhere on the scale there is a point where too much sun blockage will restrict antho expression. Is it 50%, 70%, 90% shade? I don't know if anyone has done a study to find out. Maybe a good experiment for Staci. Smiling

As far as plants 'stretching' under shade cloth, I do get a height increase of about a foot on varieties grown under shade cloth. Since I am after long stem this is actually a desirable trait. Dahlias grown further north would likely stretch more, considering the longer day length.

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