The Q&A Archives: Small Zinnia Blooms

Question: I planted 'Cut and Come Again' zinnia seeds that have sprouted and are now 1 1/2 to 2 feet tall. The leaves have some white spots on them and the blooms are VERY small (flowers start out less that 1/2 inch across). I've noticed that some of them continue to grow petals. Will this continue until they are as large as they are supposed to be?

Answer: Zinnia blooms do begin small and expand to their full size. My 'Cut and Come Again' blooms are about 2 1/2 inches across when full sized. Watch your plants and let us know if they don't turn out as you expected. I think they'll be fine. This variety really does well in Texas.

The white spots may be powdery mildew, or the beginning of a bacterial spot. Powdery mildew appears as white patches on the upper surface of the leaf. Bacterial spot appears as creamy white areas in the leaf that soon turn black and angular. Control for these two is very different. If the problem continues submit another question with a detailed description of the spot and where on the plant and leaf it appears and we'll be happy to offer suggestions for control.

In the meantime, minimize overhead watering as this can increase some fungal and bacterial disease problems.

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