The present invention relates to novel Pelargonium hortorum--interspecific plants having dark red to burgundy or darker pigmented flower petal, a trailing growth habit, dark leaf color and tolerance to high temperatures, high light and edema. The present invention also relates to methods for creating novel Pelargonium hortorum--interspecific hybrid plants having dark red to burgundy or darker pigmented flower petals, a trailing growth habit and tolerance to high temperatures, high light and edema.