Some retailers offer seasonal shipping options so that plants are not subjected to extreme temperatures.Some online plant retailers have developed very loyal customers because they give great service and sell quality products. Below are a few examples on how you can buy carnation plants online Australia. Carnations boast an extensive color palette, ranging from classic reds, pinks, and whites to more captivating hues like orange, yellow, and purple. This color diversity allows you to create stunning arrangements that complement your existing décor or match a particular occasion.