Mid-October is flowering time for the widespread (Canada south to Texas) native oblong aster, Aster oblongifolius (aka: Symphyotrichum oblongifolium). This amazing plant forms a large clump to 2′ tall x 8′ wide. This is the clone Aster ‘October Skies’, which is quite similar to the other widely grown clone, Aster ‘Fanny’. Average to dry soils in full sun is the key to success. Hardiness is Zone 4a-9b.