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Dill Seed
(Anethum graveolens)

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We believe, for the reasons set forth on the main Herbs directory page, that growing spice plants for seed is not wise gardening; but, for those who disagree, the information here should suffice.

About Dill Seed

Dill seed

[There is a separate page on leaf dill (dill weed).]

Dill is, we think, one of the great herbs, and is sadly underappreciated and underused in the U.S. Dill is grown for both its dried seeds and its ferny leaf; though the same plant can be used for both purposes, cultivars aimed at one or the other particular use have been bred, so one is best off using different plants, of different cultivars, for the two purposes. This page deals only with growing dill for seed.


Though there is no unequivocal trend to any one cultivar, the kind Bouquet seems to be the dill-seed (as opposed to leaf/fern dill) standard, and is the easy choice. (It is very widely available.) But note that even in a container it can get 2 to 3 feet tall.



Dill is in commercial field production in the Canadian prairies, so we should have no trouble growing it hereabouts. The usual advice is “spring”, sometimes given as “April”. But because we want the soil already warm when we plant out, early to middle May might work best in our climate.

The Bed

The general rule for herb and spice plants is that their soil needs are not demanding, save that the soil must be very well-drained: few herb or spice plants can stand “wet feet”. The soil should not be particularly rich, most especially not for flavoring plants we grow for their seed (or fruit), common mis-advice to the contrary notwithstanding: a rich soil will lower the concentration of the “aromatic oils” that give the seed its characteristic flavor, which is the very thing we are growing them for. Plants that are slightly nutrient-stressed (which doesn’t mean starved) give better-tasting seed.

Dill is typical of the remarks above. It is apparently crucial to not plant dill anywhere near fennel (or vice versa), lest the two cross pollinate and give bizarre crops. (Indeed, fennel is not a good neighbor to much of anything, and is always best grown somewhere off in a garden corner.)

Planting Out

Direct-seed dill where you want it to grow. Plant dill seed very shallow, or put it on the surface and sift a little sand or fine soil over it. Water well. Be patient: dill seed can take up to 25 days to germinate, though it is more like 2 weeks when the soil is satisfactorily warm at planting time.


When dill plants first flower, they will benefit from a light sprinkling of a fertilizer high in potassium and phosphorus.

One source says “harvest seed heads just as the seeds begin to turn a golden brown”; another says “once the flowers form, they will bloom and seed; cut the seed heads 2 to 3 weeks after bloom”. Hang cut plants to dry over a catch-cloth; when they are thoroughly dry (and the seed has turned from green to brown), dump them into a holding bag (which you will later use for threshing them).

When your seeeds are thoroughly dried, thresh the lot: beat the holding bag in which you have collected them against a hard surface to dislodge the seeds. Sift the loose seeds through a 3-inch mesh hardware cloth to remove the chaff. Make absolutely, positively sure the seeds are thoroughly dried before putting them away for storage (in the usual manner for dried herbs and spices: an airtight container stored in a dark place, preferably a cool one).

It is said to be a common practice is to “barber” dill seeds to remove the hair-like strand or whisker found at one end, but in just what this “barbering” consists is not stated in any source we saw.

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Besides any links presented above on this page, the following ought to be especially helpful.

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