You cannot be sure if the plant is homozygous or heterozygous as the data set is too small: by random chance, all three plants might have acquired only the dominant gene even if the recessive one is present.
A gene is the fundamental structural and functional component of heredity. The DNA that makes up genes. In some cases, genes serve as blueprints for the creation of proteins. In contrast, a large number of genes do not encode proteins. A few hundred DNA bases to more than 2 million bases make up the majority of human genes. Humans are thought to have between 20,000 and 25,000 genes, according to the Human Genome Project, a multinational effort to decipher the human genome's sequence and catalog its genes. Every gene is present in two copies, one from each parent, in every human being. Only a small subset of genes differ somewhat between individuals; the majority of genes are the same in all persons.
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