Answer: Seeds of portulaca need light to germinate. Use regular seed-starting mix and sow seeds on top of the moistened soil, but don't cover them with additional soil - just press them in with your hand. The seeds will take 14-21 days to germinate at temperatures of 70F - 85F degrees. If your greenhouse isn't that warm, use heat cables or propagation mats to keep the soil warm. Mist often to keep the soil moist, or cover the seeding pots or trays with plastic wrap until the seeds germinate. Remove the plastic after most of the seeds have sprouted.
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