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Although most gardeners buy fresh seeds of vegetables, hardy annuals, half-hardy annuals and greenhouse plants each year, some people like to harvest and save seeds from plants that have flowered. However, the plants that result from such seeds can sometimes be variable (gathering seeds is described below). In addition, where a plant is a hybrid – this is indicated by an x between the first (generic) and second (specific) names – its seeds will not breed true to the type; neither will those of varieties that are F1 hybrids (see box on opposite page for the meaning of this term).