Flowers You Can Still Sow in Fall By Zone Zones 35 Cold Winters, Hardy Favorites Poppies Scatter after first frost spring blooms. Sweet Peas Sow mulch lightly early flowers. Cornflowers Hardy annuals, overwinter well. Larkspur Fall sowing = tall spring spikes. Tip: Sow after the first hard frost so seeds dont sprout too early. Zones 67 Mild Cold, Long Fall Window Nigellas Tiny seeds = spring blue blooms. Foxgloves Need cold mulch roots for winter. Shasta Daisy Stronger roots when fall-sown. Tip: Mulch bases to prevent frost heaving. Zones 810 Mild Winters, Extended Growing Calendula Flowers through winter spring. Snapdragons Love cool winters spring bloom. Delphiniums Fall-sown = stronger spring spikes. Hollyhocks Establish now bloom vibrantly later. Tip: Fall sowing beats spring; heat comes too fast in warm zones.