Dill is one of the few herbs that has a season measured in weeks, not months. It grows fast, flowers fast, sets seed, and declines — the whole arc, from to empty stalk, can happen in seven or eight weeks in warm weather. Gardeners who want a steady supply learn to a small patch every three weeks from 2 weeks before the through midsummer. That staggering is the whole management strategy.
Dill has a taproot that dislikes disturbance. Direct sowing is strongly preferred over — moved seedlings tend to immediately, as if the stress of transplanting signals the plant to hurry toward seed. Sow seeds thinly in the final location, cover lightly with soil, and to 6 inches when seedlings are a few inches tall. The thinnings are edible. In cool spring weather, germination takes ten to fourteen days; in warm soil above 65°F, it can happen in a week.
The flavor lives in the feathery fronds when the plant is young and vegetative. As soon as the flat-topped yellow flower clusters (umbels) appear, the frond flavor shifts — more pungent, less fresh. If you want dill weed for cooking, harvest before flowering. If you want dill seed for pickling, let the plant go to flower and wait until the seed heads are brown and dry before cutting. Both are useful; they're just different crops from the same plant.
Dill self-seeds reliably if you let any plants go to full seed set. This can be a feature or a problem depending on your garden. A patch of dill allowed to drop seed will produce volunteers the following season — earlier than anything you'd sow intentionally. But those volunteers come up where the plant decided to drop seed, not where you planned. If you want controlled dill, deadhead before seed ripens; if you want naturalized dill, let it go.
One failure mode worth naming: dill and fennel planted near each other can cross-pollinate, producing seeds and seedlings with muddled flavor. Keep them on opposite ends of the garden. Dill is also a host plant for the black swallowtail butterfly caterpillar — green-and-black striped caterpillars that can strip a plant in a day or two. They tend to appear late in summer. Many gardeners plant extra dill specifically for them; the caterpillars are worth watching.
Varieties worth knowing
What can go wrong
Companions
How to propagate
Dill is a fast-growing annual best propagated by direct sowing. It self-sows prolifically once established, and transplanting is not recommended since it has a sensitive taproot.
Harvest & keep
Bolts quickly — succession sow. Let some plants bolt for seed heads (essential for pickle-making).
- Refrigerator
- 5–7 days fresh in water
- Freeze
- chop and freeze in water or oil cubes — retains flavor far better than drying
- Can
- not applicable as herb; used in pickle-making
- Dry
- dry seed heads and leaves; dried leaves lose most flavor
For pickle dill: cut whole flower heads just as seeds begin to form.
How it grows where you live
Sources
- Growing Dill in the Home Garden— University of Maryland Extension
- Dill Production Guide— University of Georgia Extension
- Herbs for Colorado Gardens— Colorado State University Extension