Check all dried herbs for freshness by crushing a small amount between your fingers. They should release a strong, pleasant aroma. Discard any herbs that smell weak or musty. Pro tip: Fresh herbs should be vibrant in color and aromatic when crushed.

If using whole dried rosemary, grind it in a coffee grinder or mortar and pestle until it reaches a fine powder consistency. Sift through a fine-mesh sieve to remove any large pieces. Pro tip: Rosemary can be tough and fibrous, so proper grinding is essential for smooth blending.

In a large mixing bowl, combine the sage, thyme, ground rosemary, marjoram, and oregano. Whisk together thoroughly to ensure even distribution. Pro tip: Use a whisk rather than a spoon to prevent clumping and ensure better mixing.

Add the black pepper, garlic powder (if using), and nutmeg to the herb mixture. Continue whisking until the blend appears uniform in color and texture. Pro tip: Freshly ground black pepper makes a noticeable difference in flavor intensity.

For the finest texture, pass the entire mixture through a fine-mesh sieve, pressing any larger pieces through with the back of a spoon. Pro tip: This step ensures your seasoning will distribute evenly when applied to food.

Taste the blend and adjust seasoning as needed. Add more sage for traditional flavor, extra pepper for heat, or garlic powder for savory depth. Pro tip: Remember that flavors will concentrate during cooking, so taste accordingly.

Transfer the completed poultry seasoning to clean, dry glass jars with tight-fitting lids. Fill jars leaving about 1/4 inch headspace. Pro tip: Glass jars preserve flavor better than plastic containers.

Label each jar with the contents and date of preparation. Store in a cool, dry place away from direct sunlight for optimal flavor retention. Pro tip: Properly stored, this blend maintains peak flavor for 18-24 months.