Dill

Basic Information

Seed Number

147

Seed Name

Dill

Variety

Mammoth

Category

Herb

Plant Family

Apiaceae

Plant Type

Mammoth dill (Anethum graveolens)

Planting Method

Direct Sow

Seed Status

In Seed Bank

Created

2026-08-14 00:50:34

Updated

2026-08-19 15:35:29

Planting Information

Start Planting Date

Apr 1

Last Recommended Planting Date

Jul 31

Plantable Months

April, May, June, July

Indoor Start

Not recorded

Direct Sow

Apr 1 – Jul 31

Transplant

Not Recommended

Indoor Start Weeks Before Frost

Not Recommended

Transplant Weeks After Frost

Not Recommended

Germination Days

7–21 days

Harvest/Maturity

Not recorded

Succession Planting

14 days

Growing Conditions

Ideal Soil Temperature

65-70°F

Planting Depth

1/4 in

Plant Spacing

8-12 in

Row Spacing

18 in

Thin-To Spacing

8-12 in

Sun Requirements

Full sun

Water Needs

Maintain even moisture during establishment and active growth; avoid prolonged drought

Soil Preference

Well-drained soil with moderate fertility

Minimum Container Size

3-5 gal

Plant Height

3-5 ft

Perennial/Biennial Status

Annual

Container Friendly

Yes

Trellis/Support Needed

No

Frost Tolerant

Yes

Heat Tolerant

No

Drought Tolerant

No

Pollinator Friendly

Yes

Medicinal

Yes

Garden Uses

Companion Planting

Storage

Seed Source/Brand

UMN Extension; Ferry-Morse; Rohrer Seeds; MSU companion planting

Packet Year

Not recorded

Quantity Notes

Not recorded

Purchase Date

Not recorded

Expiration Year

Not recorded

Storage Box

Not recorded

Container

Not recorded

Envelope

Not recorded

Row

Not recorded

Slot

Not recorded

Storage Notes

Not recorded

Notes

Original Planting Method: Direct sow where it will grow. Dill develops a taproot and does not love transplanting.
Original Start Planting Date: Apr 10 or when soil is workable/cool
Original Last Suggested Planting Date: ~Aug 1 for seed heads; ~Aug 25 for fresh leaves
Outdoor / Direct Sow / Transplant Window: Direct sow ~Apr 10 – Aug 25. Earlier sowings are best for full-size plants/seed production.
Days to Harvest / Bloom: Leaves earlier; ~65–70 days to maturity/seed production
Container Friendly: Yes; deep 12–18+ in container; staking may help
Pollinator Friendly: Yes; excellent when flowering; host plant for black swallowtail
Medicinal / Herbal Use: Yes; culinary herb with traditional herbal uses. Not medical guidance.
Perennial?: No; often self-seeds
Succession / Reusable Notes: Sow every 2–3 weeks for steady fresh leaves. Let some plants flower/set seed for pollinators and possible self-seeding.
Zone 6B Notes: Very easy in Zone 6B. Start in cool spring weather and repeat sowings through summer; dropped seed may return next year.
Companion Plants: Cucumbers, broccoli, Brussels sprouts, cabbage, cauliflower, lettuce, onions
Avoid Planting Near / Watch Outs: Keep some distance from carrots if both are flowering. Tall plants can lean in wind. Black swallowtail caterpillars may eat foliage; beneficial wildlife.
Sources: UMN Extension: https://extension.umn.edu/yard-and-garden/growing-dill | Ferry-Morse: https://ferrymorse.com/products/dill-mammoth-organic-seeds | Rohrer Seeds: https://rohrerseeds.com/products/dill-mammoth-pkt | MSU companion planting: https://www.canr.msu.edu/resources/companion_planting

[[RESEARCH ENRICHMENT START]]
Zone 6B: Direct sow as soon as the soil can be worked in spring. Repeat sowings every 2-3 weeks for continued leaf production. Mammoth is particularly useful for flower heads and mature seed for pickling.
Germination: Dill germinates in approximately 7-21 days at 65-70°F. Direct sowing is preferred because dill develops a taproot and dislikes transplanting.
Harvest: Harvest foliage as needed before flowering. Harvest flower umbels for pickling when flowers or young seed begin developing, or allow seed heads to brown for mature dill seed.
Seed Saving: Allow umbels to turn brown and dry. Cut heads into paper bags and thresh once completely dry. Dill can cross with other dill varieties.
Special Care: Mammoth dill can reach 3-5 feet and may benefit from a sheltered location in strong wind.
Research Source: Johnny's Selected Seeds — https://www.johnnyseeds.com/herbs/dill/ — dill direct sowing and general culinary herb production
Research Source: Johnny's Selected Seeds — https://www.johnnyseeds.com/herbs/dill/hera-organic-dill-seed-3149G.html — 7-21 day germination at 65-70°F and direct sowing as the recommended dill method
Research Source: Epic Gardening — https://shop.epicgardening.com/products/dill-mammoth-org — Mammoth dill 3-5 foot mature height, culinary foliage, pollinator flowers and seed production
[[RESEARCH ENRICHMENT END]]