Yes, you should remove stems before grinding, whether you’re working with cannabis or culinary herbs. Stems add harsh flavor, produce inferior results, and can damage your grinder over time. The extra few seconds of picking them out makes a noticeable difference in quality.
Why Stems Hurt the Final Product
Stems are mostly structural plant fiber. They contain high amounts of cellulose and lignin, the same tough compounds that make wood rigid. In cannabis, this means stems carry very little of the active compounds or aromatic oils that make flower useful. Without meaningful terpenes or flavonoids, stems dilute potency and flatten flavor.
For culinary herbs like rosemary, thyme, and sage, the woody stems carry a bitter, fibrous taste that overwhelms the delicate oils concentrated in the leaves. Oregon State University’s food preservation guidelines recommend discarding imperfect stems during herb preparation. When dried herbs are ready for use, the stems should be brittle enough that leaves fall away easily, making separation straightforward.
What Happens If You Grind Stems Anyway
Grinding cannabis with stems produces hotter, harsher smoke. The cellulose in stems conducts heat more efficiently than flower, requiring higher temperatures to burn. That extra heat irritates your throat and lungs, and the smoke tastes noticeably worse. You’re essentially padding your ground material with plant fiber that contributes almost nothing except an unpleasant experience.
With culinary herbs, leaving woody stems in creates an uneven grind. The leaves crumble into fine flakes while the fibrous stems resist breaking down, leaving you with sharp, chewy bits in your food. This is especially noticeable with rosemary and thyme, where the stems are tough enough to remain intact even after aggressive grinding.
Stem Removal Protects Your Grinder
Thick, woody stems are harder than dried leaves and flower, and they put extra stress on grinder teeth. Hard bits can cause teeth to chip or break, particularly in acrylic or low-quality metal grinders. Even in well-built grinders, stems contribute to clogging and make the grinding mechanism harder to turn. A quick visual check before loading your grinder prevents unnecessary wear and keeps it functioning smoothly for longer.
How to Remove Stems Efficiently
For cannabis, simply pinch or snap the flower away from the stem before placing it in your grinder. Larger stems are obvious, but it’s worth pulling out the smaller interior stems too, since even thin ones add harshness without contributing anything useful. If you’re processing a larger amount, breaking buds apart by hand over a tray makes it easy to spot and discard stems as you go.
For dried culinary herbs, hold the top of the stem and run your fingers down in the opposite direction of growth. The dried leaves will strip off cleanly. With herbs like thyme, where the leaves are tiny, this stripping method works faster than picking individual leaves. For rosemary, pull the needles downward off the woody stem in one motion. Crush or grind the leaves only when you’re ready to use them, since whole dried leaves hold their aroma and flavor much longer than ground herbs do.
What to Do With Leftover Stems
Cannabis stems don’t need to go in the trash. While they contain minimal active compounds, you can extract what’s there through a simple infusion process. Bake the stems at 240°F (115°C) for 30 to 40 minutes to activate the compounds, then simmer them in water with a tablespoon of coconut oil or butter for 15 to 20 minutes. Strain out the plant material, drop in a tea bag for flavor, and you have a mild tea. It won’t be strong, but it’s a way to use material you’d otherwise throw away.
Culinary herb stems work well in stocks, soups, and braises where they can simmer for a long time and be removed before serving. Rosemary and thyme stems tied into a bundle add flavor to a pot of soup without leaving woody bits in the finished dish. Just pull them out before plating.