Halleck Horticultural Plantgeek Chic 10 Steps to Grow Tiny How to Pick a Coffee Plant Out of a Botanical Line Up In pea plants, purple flowers are dominant over white flowers. Two plants, both heterozygous for the gene that controls flower color, are crossed. What percentage of their offspring will have purple flowers? Many plants today orginate from the wild mustard plant and were created by artificial selection : r gardening