Harvesting Fennel Seeds


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Harvesting fennel seeds is easy, whether the plants are in your garden or you are harvesting wild fennel seeds. 

Dried wild fennel seeds on the plant.
Photo by Hank Shaw

Late summer and autumn is the time for harvesting fennel seeds. Here in California, we have wild fennel everywhere here, and the time to gather is before the first real rains — they will have dried nicely. Gathering fennel seeds isn’t rocket science, but there are a few tips I can offer to make it more productive.

First, know that wild fennel and garden fennel are one and the same plant, Foeniculum vulgare. It’s a European immigrant, believed to have been brought here by Italians. Many states have branded this lovely, anise-scented plant a noxious weed; one of my friends, a biologist named Charlie, was once employed to kill any fennel he saw on Catalina Island. Suffice to say it’s OK to pick as much of this plant as you want.

Wild (really feral) fennel differs from garden fennel in that it rarely sets a bulb and has smaller seeds than the domesticated variety. Both are perennials down to Zone 6 (winter lows down to -10°F) and possibly down into Zone 5, where winter temps drop all the way to -20°F. Tough plants. Fennel is herbaceous, meaning it “dies” every year and regrows in spring; it’s actually not dead, the root is just fine.

According to the USDA, wild fennel grows all over America, except for the Intermountain West, Oklahoma (oddly), Vermont and New Hampshire, Indiana, Arkansas and Mississippi. It also supposedly grows in British Columbia, Ontario and Quebec, although I’ve never seen it there. Honestly, however, I’ve never seen wild fennel anywhere other than California and the Pacific Northwest.

I’ve written about foraging for fennel before, but not about gathering the seeds. Here’s how I do it:

Wait until at least August, and September is better. The seeds take a long time to ripen, but you want to get them before the birds do. Birds, especially little warblers, love to eat fennel seeds. When the time is right, grab a paper bag and some scissors. Go out and find some fennel.

Fennel likes to live in colonies, so it will be bunched up. At the seed-gathering stage fennel will be taller than most men, typically up to seven feet tall. Keep in mind that it can grow near hemlock, which just happens to be one of the most poisonous plants in North America. Fennel has ferny leaves where hemlock tends to have leaves a bit more like a carrot. Hemlock is to the left, fennel to the right:

Hemlock and wild fennel side by side.
Photo by Hank Shaw

But the surefire way to tell fennel from really anything else is the aroma: If it smells like anise or licorice, it’s fennel. Hemlock smells musty, like mice in an attic.

Once you’ve found your fennel, look at each seed head: Many will have been either pillaged by birds, or never set seed at all. Look for the seed heads with the largest seeds and snip off the whole head with scissors and put it into your bag. It shouldn’t take long to fill a grocery bag.

Photo by Hank Shaw

Once you get home, get yourself something to toss the empty seed heads in (compost bag?) and a broad, flat container like a casserole dish or a baking sheet. Take each seed head and remove the seeds from each little cluster with your thumb and forefinger, dropping them into the dish below. The force and motion I use is a lot like wiping something sticky off your fingers. I managed to get 4 ounces of seed in about 25 minutes of doing this.

When all the seed heads are free of seeds, toss them in the compost and turn your attention to the dish of seeds, which will need to be cleaned. I pick through and find all the little clusters that fell in (they look like teeny octopi or spiders) and remove them. It helps to have tweezers. Pick through and remove as many little twigs, bugs and debris as possible.

Finally, put your seed into a jar and freeze it for a week. Why? There might be insect eggs or grown bugs you missed in your seeds, and you don’t want an infestation in your seed. Freezing will kill everything too small to see. Once you’re done with this step, keep your fennel in the spice cabinet. It will last a year or so.

Once you’re finished harvesting fennel seeds, you can use them in any way you would store-bought ones. Some of my favorite uses are in sweet anise cookies, as an additional hit of flavor in my fennel sauerkraut, and they are the key ingredient in my fennel salami and sweet Italian sausage

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About Hank Shaw

Hey there. Welcome to Hunter Angler Gardener Cook, the internet’s largest source of recipes and know-how for wild foods. I am a chef, author, and yes, hunter, angler, gardener, forager and cook. Follow me on Instagram and on Facebook.

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  1. I hadn’t thought to freeze them, great tip. It’s a weed in our Surrey UK garden but I love it with fish and in sausages and tea. Thanks for your post.

  2. Hank,
    I grow fennel in my herb garden and collect the pollen in the spring and early summer before the seeds set, dry it in a paper bag and use it in sausage recipes, risotto, etc.. Excellent in Italian sausage.

  3. I live in an old Italiam neighbourhood in Powell River, BC and there is fennel growing in my patio along the neighbour’s fence. It gets to be 7-8 ft high with stalks up to 3/4″ diameter. We have a constant supply of fresh sprigs through spring, summer and fall. Fennel is alive and well in British Columbia!

  4. Your wild fennel article was very informative. Do you know anyone that sells harvested wild fennel? I’d be interested. Thanks

  5. Driving through the Los Padres Forest today in my town of Santa Barbara, I noticed some plump and delicious looking fennel seeds. I stopped for a taste, gathered a couple tablespoons full and was ready to continue on my journey. While picking up some litter, trying to be a good Samaritan, a ranger pulled up and asked what I was up to. I informed her I had gathered some fennel seeds. She asked me how many, I shrugged. She wanted to me to show her my seeds!
    I went to the cab of my truck and let her look in the bag thinking nothing of it.
    Well, lesson learned. One is not to gather fennel seeds in the national forest.
    She let me off the hook, thank goodness.

    On another note Hank, I randomly picked up your book, “Hunter, Angler, Cook” today at the library while in search of something else. I love your blog, and was not aware you had a book out! So excited! Thank you!

    1. Yes, but if they are not quite dry, you can dry them out in the house. Make sure they are very dry before harvesting, or the seeds will stick to the stems.

  6. I know a guy who has a few beehives…and lots of fennel plants nearby. The honey he gets has an anise-flavored essence. Might sound off-putting at first, but it’s quite good!

  7. I’m sure you know this, Hank, but others might like to know that near the coast you can still find lovely fennel flowers loaded with pollen. Here in Novato, most of the fennel is close to seed harvesting stage. Also, on the way to Sonoma the other day very near the Infineon Raceway (Sear’s Point), I noticed brand new fennel that was growing back after being mowed. I try not to pick too close to highways, but found it interesting that this tough plant will insist on doing its thing even after getting whacked down to the ground.

  8. Just as an aside….fennel does grow wild in Colorado. Or at least it does as an escaped cultivar. Not very wide spread but I’ve a quantity in my back yard that I mow down in the vineyard all summer. We steep the seed in vodka and use the result to de-glaze with. It makes a nice stand in for pastis as well. This year we tried it in place of dill in our pickled green beans.