Genealogy for Plants cannot readily be done with the same software that we use for human families (and which can be used for other animals, though perhaps with difficulties), for two reasons.
One, many plants are self-fertile. There are flexible and variable versions of this, such as with apple trees which may require a pollinator-variety, or may bear fruit by themselves. Conversely, other plants like peas, tomatoes and cereal grains, normally fertilize themselves and are not cross-pollinated at all.
Two, many crop-plants are propagated vegetatively, which means that genetic individuals that were ‘born’ long ago can be used for breeding, today. This happens not only with fruiting trees or grapevines that are tended by humans across centuries, but in the wild too, and in different forms.
Very long-lived trees are an obvious case, but consider also the Aspens, which grow as clonal colonies in which individual trees come & go, but the genetically single-individual colony carries on sometimes for hundreds, even thousands of years.
An additional complication arises with vegetatively or clonally propagated lines, in which a variation of the plant arises, and can itself be propagated. In agriculture and horticulture, these are called sports. These can be valuable, and any plant pedigree system must accommodate them, even though most sports are not transmitted genetically.
An important category of sports in apples, is the fruiting-spur on which some apple varieties bear fruit. Typically, spurs appear on young but not new branches, and after bearing flowers & fruit for a few season, they fall off. But sometimes a tree (or branch) is seen to retain its spurs for many years. Thus, the heavy fruit is borne on larger & stronger branches, even the main trunk; as well, the spurs help to regulate the spacing & distribution of the crop, and to moderate so-called alternating-bearing – a big crop one year, little the next.
Variagation, the presence of white patterns in leaves, is a valuable decorative plant feature, and is normally a sport. Thornless blackberries are sports.
Yet again, there can be sudden mutations of cloned plants, which are indeed genetic and can be transmitted sexually (as well as asexually).
All of these considerations that are peculiar to plants, must be kept in mind when designing software to build databases of plant-families, and to display this information in charts such as Pedigrees & others.