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All annuals benefit from fertilizer application. A slow release fertilizer will fertilize every time you water and lasts two to three months in a container. If you prefer, you can use a liquid fertilizer. Read and follow all the product directions for how much and when to apply.

Morning glories do some interesting things from seed. There is quite a bit of genetic variation, so you can see some traits that may have been genetically locked up waiting to be expressed. I've seen some weird ones. I've seen speckles, all the way to A single portion of the fused petals being white all of the way down. I've seen color changes, and plants with many colors on the same plant. Who knows!? Maybe the next generation expresses other different traits!

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm