Paeonia 'Festiva Maxima' 'Festiva Maxima' peony Size: 30 to 48" high and 30 to 36" wide. Hardiness: Zones 2 to 9. Heat Zones: 9 or 8 to 1. Habit: Sturdy upright stems in spring. The stems bear handsome, deeply cut, glossy foliage with narrow, sometimes lobed leaflets. Culture: Full Sun to light shade.