The present invention relates to novel Pelargonium hortorum-interspecific plants having dark red to burgundy or darker pigmented flower petal, qa 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 petal, a trailing growth habit and tolerance to high temperatures, high light and edema