The hardy geraniums do have a few varieties with true blue flowers but there are no known true blue Pelargoniums. To date, all yellow flowering varieties are a pale yellow or cream colour and not the vibrant yellow of a Sunflower one would expect.Click to see full answer. Herein, are there any yellow geraniums?While there are species pelargoniums with yellow flowers, a true yellow zonal has only existed in the dreams of gardeners. Previous efforts have resulted in pale, cream or buttermilk colored plants but a true yellow has finally hit the market.Furthermore, why are my geranium leaves turning yellow? Causes of Geraniums with Yellow Leaves One of the most common causes for yellowing leaves is too much moisture or overwatering. Remember, geraniums are drought tolerant plants and they do not like too much water. Water or air temperature that is too cool can also result in geranium yellow leaves. what Colour are geraniums? Geranium flowers present in a range of colors, from the common white, pink and red, to more unusual shades of orange and purple.How many different types of geraniums are there?63 Different Types of Geraniums. It has over 400 species with a wide range of variety in shapes, sizes, height, fragrances and foliage. Some Geraniums are tailing, some are upright and some have single bloom while some have double. Geraniums are also called Crane’s Bill because of the resemblance with its seed capsule.