Polygala major aka Groe Kreuzblume

Polygala major is a perennial: it lives more than one year. It belongs to the milkwort family, Polygalaceae. Chicago Botanic Garden calls it big milkwort. Its native range runs from east-central and southeastern Europe to northern Iran. Kew places it in the temperate region. The Royal Horticultural Society accepts this as the correct name. Its species page says it is not native to Britain or Ireland.

Big milkwort grows upright. The sources give no height or spread for a full-grown plant. Its full size in a garden thus remains unclear. They give no details on this species' leaves, stems, or roots. The RHS page does describe the wider genus, or plant group. But that does not show which traits this species has. The sources give no account of its bark. Nor do they say how its leaves change with the seasons.

Chicago Botanic Garden records purple flowers from May through June. In that garden's account, bloom spans late spring to early summer. The source does not describe the flowers' shape or scent. It gives no details on fruit or seeds. Nor does it name what pollinates the flowers. The evidence supports the bloom's color and season, but not those other traits. It does not say how long each flower lasts.

The garden lists full sun and part shade as suitable. It records moist soil and USDA hardiness zones 4–8. These give the clearest facts on growing needs in the sources. No source states soil texture, pH, or drainage needs. None gives a plan for when to water. The records do not say how well it copes with drought. Nor do they state how fast it grows. They give no basis to judge how much care it needs. The Chicago entry is an archived page. The garden no longer updates it.

Chicago Botanic Garden lists planting beneath taller plants as a landscape use. Its upright form and purple bloom are its main recorded visual traits. The sources do not describe cut-flower or ground-cover use. They name no pests, diseases, or other garden problems. No source establishes which parts people can eat or use as medicine. None establishes safety for people or pets. These gaps do not prove that the plant is safe. The sources give no assessment of its risk of extinction. Nor do they give evidence that it spreads invasively.