In Zone 5, cold stratification is often beneficial for poppy seeds to improve germination rates. To cold stratify, place the seeds in a sealed plastic bag with a bit of moist potting mix or sand and refrigerate them for about 4 to 6 weeks before sowing. This mimics winter conditions and helps break the seed dormancy.

direct sowing poppy seeds should be done in early spring, typically around late March to early April while the soil is still cool. Poppies prefer cooler soil temperatures for germination.

When sowing poppy seeds indoors using soil blocks, start by filling the blocks with a high-quality seed-starting mix. Poppy seeds need light to germinate, so lightly press them onto the surface of the soil blocks without covering them. Moisten the soil evenly, ensuring it remains consistently damp but not waterlogged. Place the soil blocks in a bright location with plenty of light, or under grow lights, to promote healthy seedling development. Maintain a temperature of around 65-70°F (18-21°C) for optimal germination, which usually takes 10-14 days. Once seedlings have emerged and developed their first set of true leaves, they can be transplanted into larger pots or directly into the garden, depending on the timing and weather conditions.

To extend the bloom period of poppies, practice succession planting by sowing seeds in early spring and then again in late spring or early summer. Start the first batch of seeds indoors 6-8 weeks before the last frost and transplant them once the danger has passed. Follow up with a second sowing for continuous color in your garden throughout the season.