Viewing post #1353565 by teddahlia

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You are viewing a single post made by teddahlia in the thread called Color as are faded?.
Imageteddahlia
Aug 17, 2020 1:03 PM CST
Name: Ted
Oregon
We enjoy breeding new dahlias!
My information came from the Stanford website where Dr Walbot had students do short scientific experiments on dahlias. The buds of the flowers were covered in aluminum foil and the color compared to those that were grown uncovered. Some anthocyanins require sunlight to form .. This is also evident in black foliage plants where the anthocyanin in the stems and leaves is darker in full sun.

In my garden I have a variety called Hollyhill Fireball that requires sunlight to form the red flame flowers. It needs the sun so bad that in the course of the season the flowers become lighter in color going from an intense flame to a lighter flame and ending up almost solid yellow. It is the shorter hours of sunlight that cause the change in color. It is my theory that not all anthocyanins take the same amount of sunlight to form. There are several versions of anthocynins in dahlias. So, if your variety is dependent on sunlight to form pigment the flowers will be much lighter under shade cloth. Yellows need no worry. Whites my look good there. Some reds will be OK. Others will not do well. What about purple? I do not use shade cloth and do not know.
Shade cloth cause overly tall plants and long stems in our area. 11 foot tall plants are commonplace. Stems can become too long to show. Umbrellas can be folded up easily and extended easily for the best of both worlds.
We like to place a sign on our porch that says: We are in the garden. Really, we are always in the garden.

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