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Growing dahlias from seeds using the wet towel method is a technique called germination by stratification. Here's a step-by-step guide on how to grow dahlia seeds using wet towels:

Materials Needed:

Dahlia seeds
Paper towels or coffee filters
Plastic zipper bags or plastic wrap
Water
Small containers or pots
Potting mix
Procedure:

Preparation of Seeds:

Moistening the Towels:

Dampen a paper towel or coffee filter with water, ensuring it is not soaking wet but evenly moist.
Placing Seeds:

Lay the dahlia seeds on one-half of the damp paper towel or coffee filter, leaving enough space between them.
Folding and Sealing:

Fold the other half of the paper towel or coffee filter over the seeds, creating a sandwich. Press lightly to ensure good seed-to-towel contact.
Place the moistened towel with the enclosed seeds inside a plastic zipper bag or wrap it in plastic wrap to maintain moisture.
Refrigeration (Stratification):

Dahlia seeds benefit from a period of cold stratification to simulate winter conditions. Place the sealed bag or wrapped towel in the refrigerator for about 2-4 weeks.
Checking for Germination:

Periodically check the seeds for signs of germination. Once the seeds start to sprout small roots, they are ready for the next step.
Potting Mix and Containers:

Fill small containers or pots with a well-draining potting mix. Ensure there are drainage holes at the bottom.
Transplanting Sprouted Seeds:

Gently transplant the sprouted dahlia seeds into the prepared containers. Plant them at a depth of about 1/4 to 1/2 inch.
Warm and Well-Lit Environment:

Place the containers in a warm and well-lit environment. Dahlias thrive in full sun, so provide adequate light for healthy seedling growth.
Watering:

Keep the soil consistently moist, but not waterlogged. Use a gentle spray or misting method to avoid disturbing the delicate seedlings.
Transplanting Outdoors:

Once the danger of frost has passed and the seedlings have developed a few sets of true leaves, you can transplant them into your garden or larger containers.
Hardening Off (Optional):

If the seedlings were started indoors, gradually acclimate them to outdoor conditions by exposing them to increasing amounts of sunlight and outdoor temperatures over a period of 7-10 days.
By following these steps, you can successfully germinate dahlia seeds using the wet towel method and eventually transplant the seedlings for outdoor growth.