The same plants often revive with the arrival of cool fall weather and bloom into early winter. Pansy plants may stay green all winter and will self-sow successfully if you allow seed to mature and drop. Snapdragon seed should be sown indoors by early February. Don't cover seed. Simply sow on the surface and gently spray to moisten.
Seeds require light for germination so covering with soil is undesirable.
A clear plastic cover retains moisture until green leaves appear. Grow in high light and allow to dry out between waterings. Pinching plants produces branching and more flowers. Snapdragons hold up to heat better than pansies and will bloom all summer. Both plants often reseed themselves so you may enjoy plants with less effort next year.