Pick and prep the greens. Choose arugula that’s fresh and perky. Rinse well to remove grit, then spin or pat completely dry. Dry leaves are essential for even dehydration.

Trim and sort. Remove thick stems on mature arugula. They can be fibrous and take longer to dry. Baby arugula usually doesn’t need trimming.

Decide on your method. You can use a dehydrator, an oven, or air-dry in a very low-humidity environment. A dehydrator gives the most consistent results.

Dehydrator method. Arrange leaves in a single layer on trays, not overlapping. Set to 95–115°F (35–46°C) for 2–4 hours, checking after 90 minutes. Leaves should be crispy and crumble easily.

Oven method. Set the oven to its lowest temperature (usually 170–200°F / 75–95°C). Line a sheet with parchment and spread leaves in a single layer. Prop the oven door open slightly to let moisture escape. Bake 45–90 minutes, flipping once, until completely dry.

Air-dry option. Lay leaves on racks in a warm, dry, breezy spot out of direct sunlight. This can take 1–2 days depending on humidity. Rotate trays for even drying.

Cool completely. Let the dried leaves cool to room temperature before grinding. Trapped heat can cause condensation in your jar.

Grind to powder. Use a spice grinder, high-speed blender, or mortar and pestle. Pulse in short bursts until fine. Sift if you want a very smooth powder, and regrind any larger flakes.

Season (optional). Stir in a pinch of sea salt or a whisper of lemon zest for brightness. Keep add-ins minimal so arugula remains the star.

Store smart. Transfer to an airtight container. Label with the date. See storage tips below to keep flavor and color vibrant.