When to Plant Poppy Seeds
Poppies do best if planted directly outdoors in their intended location rather than transplanting them. However, if necessary, they can be started in biodegradable peat pots indoors before the last spring frost. The entire peat pot can then be planted outdoors once the poppy seedlings are established. In growing zones 3 β 7, the Red Corn Poppy, Shirley Poppy β Mixed Colors and the Shirley Poppy β Mixed Double seeds can be planted in late autumn or early spring when a light frost is still possible. In zones 8 β 10, these poppy seeds should be sown in late autumn or winter.
Where to Plant Poppy Seeds
Poppies only need soil that is ordinary and moist, but well drained. They also do well in full sun.
How to Plant Poppy Seeds
Poppy seeds need to be cold stratified to germinate. Learn how to cold stratify your seed here. Papaver Rhoeas act as perennials in moderate climates, but they perform as annuals where freezing temperatures and snow occur in winter. These poppies germinate most successfully in cool to moderate temperatures and they are, in fact, frost tolerant. Poppies flower best under cool spring weather conditions. Bloom decreases on poppies as temperatures increase in summer months. The seeds should not be planted deeply; they just need to be compressed into the soil, as they need light to germinate. The best method for planting is to mix one part seed with 5 parts sand and scatter over the prepared growing area. If planting in rows, then plant the seeds 6β to 8β apart.
How to Care for Poppies
These varieties of poppy seeds generally germinate in about 20 days. You can thin the seedlings to 6β to 8β apart after they emerge. Poppies should be watered regularly, but they can tolerate dry conditions. It is not necessary to fertilize poppies. It generally takes about 60 to 90 days for poppies to bloom after the seed is planted. This timing depends very much on your growing zone and when you plant, along with Mother Natureβs cooperation. The bloom season for poppies is spring to summer. Poppy plants will bloom for a few weeks, but the length of bloom time can be extended by regular watering and application of mulch for moisture retention, as well as regular deadheading of spent flowers. It is also recommended that the seed be sown in successive plantings to extend the bloom season of the poppies.